WO2020256123A1 - Digital broadcast reception device - Google Patents

Digital broadcast reception device Download PDF

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Publication number
WO2020256123A1
WO2020256123A1 PCT/JP2020/024181 JP2020024181W WO2020256123A1 WO 2020256123 A1 WO2020256123 A1 WO 2020256123A1 JP 2020024181 W JP2020024181 W JP 2020024181W WO 2020256123 A1 WO2020256123 A1 WO 2020256123A1
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WO
WIPO (PCT)
Prior art keywords
unit
signal
digital broadcast
receiving
reception
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PCT/JP2020/024181
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French (fr)
Japanese (ja)
Inventor
森　良輔
喜修 松村
剛章 渡邉
神野　一平
淳史 大原
錠二 林
Original Assignee
株式会社ソシオネクスト
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Application filed by 株式会社ソシオネクスト filed Critical 株式会社ソシオネクスト
Priority to JP2021526929A priority Critical patent/JPWO2020256123A1/ja
Publication of WO2020256123A1 publication Critical patent/WO2020256123A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals

Definitions

  • This disclosure relates to a digital broadcast receiving device that receives digital broadcasts.
  • the channel of the broadcasting station that distributes digital broadcasting differs depending on the relay station in each region, when watching a program of the same broadcasting station on a mobile body such as a vehicle, the channel received by the mobile body corresponds to the relay station in each region. You need to switch to the channel as appropriate. Therefore, in the mobile body, a channel search is performed to search for a channel that can be received at the current position. For example, in a digital broadcast receiving device mounted on a mobile body, while receiving and viewing a channel of a predetermined relay station, a receivable channel is searched at the current position, and the search result is saved as channel information. According to this, when the reception quality of the channel of a predetermined relay station deteriorates due to the movement of the mobile body, the receiving channel can be switched to the channel of another relay station having stable reception quality.
  • Patent Document 1 discloses a receiving device including a plurality of receiving units that process high-frequency signals.
  • a channel search is performed using some of the receiving units among the plurality of receiving units, and viewing is performed using the remaining receiving units.
  • Patent Document 1 when performing a channel search, a part of the receiving unit is used for the channel search and is not used for viewing. Therefore, the reception characteristics of digital broadcasting may deteriorate, and video and audio may be interrupted.
  • An object of the present disclosure is to provide a digital broadcast receiving device that suppresses deterioration of the reception characteristics of digital broadcasting.
  • the digital broadcast receiving device includes a plurality of first receiving units that receive and process digital broadcast broadcast signals input from a plurality of antennas and output a plurality of first reception processed signals, and the plurality of first receiving units.
  • a first compositing unit that synthesizes at least two of the first received processing signals and outputs the first synthesized signal, and a first error correcting unit that performs a first error correction processing on the first synthesized signal.
  • a second error correction unit that performs a second error correction process is provided.
  • the digital broadcast receiving device of the present disclosure it is possible to suppress deterioration of the reception characteristics of the digital broadcast.
  • FIG. 1 is a diagram showing a mobile body on which the digital broadcast receiving device according to the first embodiment is mounted.
  • FIG. 2 is a diagram showing a configuration of a digital broadcast receiving device according to the first embodiment.
  • FIG. 3 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 1 of the first embodiment.
  • FIG. 4 is a diagram showing a configuration of a digital broadcast receiving device according to a second modification of the first embodiment.
  • FIG. 5 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 3 of the first embodiment.
  • FIG. 6 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 4 of the first embodiment.
  • FIG. 1 is a diagram showing a mobile body on which the digital broadcast receiving device according to the first embodiment is mounted.
  • FIG. 2 is a diagram showing a configuration of a digital broadcast receiving device according to the first embodiment.
  • FIG. 3 is a diagram showing a configuration of a digital broadcast receiving device according to
  • FIG. 7 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 5 of the first embodiment.
  • FIG. 8 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 6 of the first embodiment.
  • FIG. 9 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 7 of the first embodiment.
  • FIG. 10 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 8 of the first embodiment.
  • FIG. 11 is a diagram showing a configuration of a conventional digital broadcast receiving device.
  • FIG. 12 is a diagram showing a configuration of a digital broadcast receiving device according to the second embodiment.
  • FIG. 13 is a diagram showing a configuration of a noise removing unit of the digital broadcast receiving device according to the second embodiment.
  • FIG. 14 is a diagram showing a detailed configuration of the noise removing unit shown in FIG.
  • FIG. 15 is a diagram showing an example of noise input to the digital broadcast receiving device according to the second embodiment.
  • FIG. 16 is a diagram showing a part of the configuration of the digital broadcast receiving device according to the first modification of the second embodiment.
  • FIG. 17 is a diagram showing a configuration of a digital broadcast receiving device according to a second modification of the second embodiment.
  • FIG. 18 is a diagram showing a configuration of a digital broadcast receiving device according to the third embodiment.
  • FIG. 19 is a diagram showing an example of an arrangement of antennas connected to a digital broadcast receiving device.
  • FIG. 1 is a diagram showing a mobile body 5 on which the digital broadcast receiving device 1 according to the first embodiment is mounted.
  • the digital broadcast receiving device 1 is mounted on a moving body 5 such as a vehicle.
  • the digital broadcast receiving device 1 is connected to the main controller 4 mounted on the mobile body 5 and is controlled by the main controller 4 as needed.
  • the relay stations 6a and 6b relay and transmit the digital broadcast delivered from the broadcasting station.
  • the relay stations 6a and 6b shown in FIG. 1 are installed in different areas and transmit the same program of the same broadcasting station at different channel frequencies.
  • the channel frequency received by the mobile body 5 is appropriately switched. There is a need.
  • the digital broadcast receiving device 1 receives the signal of the channel frequency of the relay station 6a, outputs video and audio, performs a channel search for searching the receivable channel frequency at the current position, and saves the search result. To do. Then, when the reception quality of the channel frequency of the relay station 6a deteriorates, the digital broadcast receiving device 1 switches the receiving channel to the channel frequency of the relay station 6b having a high reception quality.
  • FIG. 2 is a diagram showing the configuration of the digital broadcast receiving device 1 according to the first embodiment. Note that FIG. 2 also shows a plurality of antennas 2a, 2b, 2c, 2d for inputting broadcast signals such as digital broadcasting, and video / audio output units 3a, 3b for outputting video / audio.
  • the digital broadcast receiving device 1 includes a diversity receiving unit 10 and a second receiving unit 50. Further, the digital broadcast receiving device 1 includes a channel information acquisition unit 40.
  • the diversity receiving unit 10 is a signal receiving unit for performing diversity communication.
  • the diversity receiving unit 10 includes a plurality of first receiving units 11a, 11b, 11c, 11d, a first synthesis unit 33, a second synthesis unit 34, a first error correction unit 35, a second error correction unit 36, and the like.
  • a switching unit 37 is provided.
  • the diversity receiving unit 10 includes PLLA 12 and PLLB 13.
  • the plurality of first reception units 11a to 11d receive and process the broadcast signals of digital broadcasting input from the plurality of antennas 2a to 2d, and output the plurality of first reception processing signals sa, sb, sc, and sd. That is, the first receiving unit 11a receives and processes the broadcast signal input from the antenna 2a and outputs the first reception processing signal sa.
  • the first receiving unit 11b receives and processes the broadcast signal input from the antenna 2b and outputs the first reception processing signal sb.
  • the first receiving unit 11c receives and processes the broadcast signal input from the antenna 2c and outputs the first reception processing signal sc.
  • the first receiving unit 11d receives and processes the broadcast signal input from the antenna 2d and outputs the first reception processing signal sd.
  • Each of the first receiving units 11a to 11d includes a tuner unit 21, an AD conversion unit 31, and a demodulation unit 32.
  • the tuner section 21 is composed of a first amplification section 22, a mixer section 23, a band filter 24, and a second amplification section 25.
  • the first amplification unit 22 amplifies the broadcast signal of the digital broadcast input from the antennas 2a, 2b, 2c or 2d, and outputs the amplified amplification signal s22 to the mixer unit 23. Further, a frequency signal corresponding to the frequency of the broadcast signal is input to the mixer unit 23 by the PLLA 12 or the PLLB 13.
  • the tuner unit 21 controls the mixer unit 23 and the band filter 24 in accordance with the amplified signal s22 and the frequency signal output from the PLLA 12 or PLLB 13 to generate an analog signal having a predetermined frequency band.
  • the second amplification unit 25 amplifies the analog signal output from the band filter 24 and outputs it to the AD conversion unit 31.
  • the AD conversion unit 31 converts the analog signal amplified by the second amplification unit 25 into a digital signal s31 and outputs it to the demodulation unit 32.
  • Each demodulation unit 32 demodulates the digital signal s31 and outputs the first reception processing signals sa to sd, which are the output signals of the first reception units 11a to 11d.
  • the first reception processing signals sa to sd are, for example, signals based on signals having the same channel frequency. Further, the demodulation unit 32 outputs information on the reception quality of the currently received broadcast signal to the main controller 4 based on the demodulated digital signal s31.
  • the first synthesis unit 33 synthesizes at least two of the plurality of first reception processing signals sa to sd output from the plurality of first reception units 11a to 11d to generate the first composite signal s33.
  • the first synthesis unit 33 arbitrarily selects and synthesizes a plurality of first reception processing signals sa to sd.
  • the first synthesis unit 33 outputs the first synthesis signal s33 to the first error correction unit 35.
  • the first error correction unit 35 performs the first error correction process on the first composite signal s33.
  • the first error correction unit 35 performs a channel search (hereinafter, may be simply referred to as “channel search”) for searching the channel frequency of digital broadcasting, and without performing the channel search.
  • channel search for searching the channel frequency of digital broadcasting
  • normal reception the first error correction processing is performed on the first composite signal s33.
  • the first error correction unit 35 outputs the signal after the error correction processing to the video / audio output unit 3a and the channel information acquisition unit 40.
  • the first error correction unit 35 may perform decoding processing.
  • the second synthesis unit 34 synthesizes at least two of the plurality of first reception processing signals sa to sd output from the plurality of first reception units 11a to 11d to generate the second composite signal s34.
  • the second synthesis unit 34 arbitrarily selects and synthesizes a plurality of first reception processing signals sa to sd.
  • the second synthesis unit 34 outputs the second synthesis signal s34 to the second error correction unit 36 via the switching unit 37.
  • the switching unit 37 is a switch that can be selectively switched according to either a channel search or a non-channel search, and the switching operation is controlled by, for example, the main controller 4.
  • the second receiving unit 50 is a receiving unit added for performing a channel search.
  • the second receiving unit 50 performs a channel search when the reception quality of the broadcast signal of the digital broadcast falls below a predetermined reception quality value, and starts acquiring channel information.
  • a predetermined reception quality value as a determination standard is set in advance by, for example, a five-step evaluation in consideration of signal strength and noise in a predetermined frequency band.
  • the main controller 4 determines whether or not to perform the channel search based on the information on the reception quality acquired from the demodulation unit 32 of the diversity reception unit 10.
  • the information regarding the reception quality may be acquired from the first synthesis unit 33 or the second synthesis unit 34, or may be a bit error rate calculated during the error correction processing in the subsequent stage.
  • the second receiving unit 50 performs a channel search based on the instruction of the main controller 4.
  • the second receiving unit 50 receives and processes the broadcast signal of the digital broadcast branched and input from the branching unit n1 between the antenna 2d and the first receiving unit 11d, and outputs the second reception processing signal s2.
  • the second receiving unit 50 includes a tuner unit 51, an AD conversion unit 61, and a demodulation unit 62.
  • the tuner section 51 is composed of a first amplification section 52, a mixer section 53, a band filter 54, and a second amplification section 55.
  • the first amplification unit 52 amplifies the broadcast signal of the digital broadcast input from the branch unit n1, and outputs the amplified signal s52 obtained by amplification to the mixer unit 53.
  • the tuner unit 51 controls the mixer unit 53 and the band filter 54 in accordance with the amplified signal s52 and the frequency signal output from the PLLA 12 or PLLB 13 to generate an analog signal having a predetermined frequency band.
  • the second amplification unit 55 amplifies the analog signal output from the band filter 54 and outputs it to the AD conversion unit 61.
  • the AD conversion unit 61 converts the analog signal amplified by the second amplification unit 55 into a digital signal s61 and outputs it to the demodulation unit 62.
  • the demodulation unit 62 demodulates the digital signal s61 and outputs the second reception processing signal s2, which is the output signal of the second reception unit 50.
  • the second reception unit 50 outputs the second reception processing signal s2 to the second error correction unit 36 via the switching unit 37.
  • the second error correction unit 36 performs a second error correction process on each of the second composite signal s34 and the second reception processing signal s2.
  • the second error correction unit 36 is connected to the second synthesis unit 34 by the operation of the switching unit 37 at the time of normal reception, performs the second error correction processing on the second synthesis signal s34, and performs error correction.
  • the processed signal is output to the video / audio output unit 3b.
  • the second error correction unit 36 is connected to the second reception unit 50 by the operation of the switching unit 37 at the time of channel search, performs the second error correction processing on the second reception processing signal s2, and performs error correction.
  • the processed signal is output to the channel information acquisition unit 40.
  • the second error correction unit 36 may perform decoding processing.
  • the channel information acquisition unit 40 acquires channel information based on the signals output from the first error correction unit 35 and the second error correction unit 36. Specifically, the channel information acquisition unit 40 creates and saves a channel table showing the correspondence between the frequency and the channel of the digital broadcast that can be received at the current position.
  • the main controller 4 selects a channel to be received by the first receiving units 11a to 11d based on the acquired channel information, and instructs the first receiving units 11a to 11d to select the channel.
  • the main controller 4 instructs the second receiving unit 50 to select channels so that the channels when the second receiving unit 50 performs the channel search are changed in order.
  • the digital broadcast receiving device 1 of the present embodiment includes a second receiving unit 50 different from the first receiving units 11a to 11d, and performs a channel search using the second receiving unit 50. Therefore, it is not necessary to use the first receiving units 11a to 11d to perform the channel search, and the first receiving units 11a to 11d can be used as the receiving unit for viewing, which is the original purpose. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
  • first receiving units In the above, an example in which four first receiving units are provided is shown, but the present invention is not limited to this, and the plurality of first receiving units may be two or more or five or more.
  • the present invention is not limited to this, and a plurality of second receiving units 50 may be provided.
  • the signals after the reception processing by the plurality of second receiving units 50 may be combined, and the combined signal may be output as the second reception processing signal s2.
  • power is distributed from the antenna 2d to the first receiving unit 11d and the second receiving unit 50 via the branching unit n1, but the two signals after the branching may have equal power.
  • a power difference may be provided.
  • the power of the signal input to the first receiving unit 11d may be larger than the power of the signal input to the second receiving unit 50. Good.
  • the number of antennas connected to the second receiving unit 50 is one, but the present invention is not limited to this, and another antenna different from the antenna 2d may be connected to the second receiving unit 50. In that case, the second receiving unit 50 may perform the receiving process after synthesizing the signals input from the antenna 2d and the other antenna.
  • the diversity receiving unit 10 and the second receiving unit 50 may be composed of one LSI (Large Scale Integration) chip.
  • the AD conversion unit 31, the demodulation unit 32, the first synthesis unit 33, the second synthesis unit 34, the first error correction unit 35 and the second error correction unit 36, and the AD conversion unit 61 and the demodulation unit 62. And may be composed of one LSI chip.
  • the tuner unit 21, PLLA 12 and PLLB 13, and the tuner unit 51 may be configured by one LSI chip.
  • the tuner unit 21, PLLA 12 and PLLB 13 may be composed of one LSI chip, the tuner unit 51 may be composed of one LSI chip, and at least two of the above LSI chips may be packaged.
  • the channel information acquisition unit 40 may be provided on any of the above LSI chips.
  • FIG. 3 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 1 of the first embodiment.
  • the digital broadcast receiving device 1 of the modification 1 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
  • the second receiving unit 50 receives and processes the broadcast signal of the digital broadcast input from the antenna 2e and outputs the second reception processing signal s2.
  • Other configurations are the same as those of the first embodiment shown in FIG.
  • the second receiving unit 50 of the first modification inputs digital broadcasting from the antennas 2e independent of the antennas 2a to 2d of the diversity receiving unit 10. As a result, it is not necessary to branch the signals input to the antennas 2a to 2d and distribute them to other antennas, and it is possible to suppress deterioration of the reception characteristics of digital broadcasting.
  • the receiving function may be lower than that of the diversity receiving unit for viewing high-definition video and audio.
  • the antenna 2e may be installed in a place different from the place where the antennas 2a to 2d are arranged.
  • the antennas 2a to 2d may be installed on the upper part of the windshield of the vehicle, and the antennas 2e may be arranged on the lower part of the windshield or on the dashboard.
  • FIG. 4 is a diagram showing the configuration of the digital broadcast receiving device 1 according to the second modification of the first embodiment.
  • the digital broadcast receiving device 1 of the second modification includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
  • the second receiving unit 50 and the channel information acquisition unit 40 are the same as those in the first embodiment.
  • the diversity receiving unit 10 of the modification 2 does not include the second combining unit 34, the switching unit 37, and the video / audio output unit 3b.
  • the diversity receiving unit 10 of the second modification includes a plurality of first receiving units 11a to 11d, a first synthesis unit 33, a first error correction unit 35, and a second error correction unit 36.
  • the first receiving units 11a to 11d, the first combining unit 33, and the first error correcting unit 35 are the same as those in the first embodiment.
  • the first error correction unit 35 performs the first error correction processing at the time of channel search for searching the channel frequency of digital broadcasting and at the time of normal reception for receiving digital broadcasting without channel search, and performs an error correction process.
  • the corrected signal is output to the video / audio output unit 3a.
  • the second error correction unit 36 performs the second error correction processing on the second reception processing signal s2. For example, the second error correction unit 36 does not perform the second error correction process at the time of normal reception.
  • the second error correction unit 36 performs the second error correction processing on the second reception processing signal s2 at the time of channel search, and outputs the signal after the error correction processing to the channel information acquisition unit 40.
  • the channel information acquisition unit 40 acquires channel information based on the signals output from the first error correction unit 35 and the second error correction unit 36.
  • the main controller 4 selects a channel to be received by the first receiving units 11a to 11d based on the acquired channel information, and instructs the first receiving units 11a to 11d to select the channel.
  • the main controller 4 instructs the second receiving unit 50 to select channels so that the channels when the second receiving unit 50 performs the channel search are changed in order.
  • the digital broadcast receiving device 1 of this modification also has a second receiving unit 50 different from the first receiving units 11a to 11d, and the second receiving unit 50 is used to perform a channel search. Therefore, it is not necessary to use the first receiving units 11a to 11d to perform the channel search, and the first receiving units 11a to 11d can be used as the receiving unit for viewing, which is the original purpose. Therefore, it is possible to suppress deterioration of reception characteristics in digital broadcasting.
  • the second error correction section 36 is an error correction section dedicated to the channel search, for example, only a part of the data (such as the one-segment area in terrestrial digital broadcasting) is used. Can be configured to process. Further, the second receiving unit 50 can also be configured to process only a part of the signal (one-segment region or the like). As a result, the modified digital broadcast receiving device 1 can be configured to process only a specific part of the signals, and the circuit scale such as logic and memory can be reduced.
  • FIG. 5 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 3 of the first embodiment.
  • the digital broadcast receiving device 1 of the third modification includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
  • the second receiving unit 50 of the third modification is the first receiving unit (for example, 11d) and the second receiving unit 50 of one of the plurality of first receiving units 11a to 11d during normal reception without channel search. Is receiving the same channel frequency of digital broadcasting, that is, the setting of the first amplification unit 52 to the second amplification unit 55 of the second reception unit 50 is set to the first amplification unit 22 to the first reception unit 11d.
  • the intermediate signal s50 transmitted in the second reception unit 50 is output to the first reception unit 11d.
  • the intermediate signal s50 is a signal in the middle of processing or a signal that has been processed in the second receiving unit 50.
  • the first receiving unit into which the intermediate signal s50 is input is the first receiving unit 11d connected to the second receiving unit 50 via the branching unit n1. That is, the one first receiving unit is the first receiving unit 11d that shares the antenna 2d with the second receiving unit 50.
  • the first receiving unit 11d performs reception processing based on the broadcast signal and the intermediate signal s50 input from the antenna 2d.
  • the intermediate signal s50 of the second receiving unit 50 is transmitted to the plurality of first receiving units. It is returned to the first receiving unit 11d of one of 11a to 11d and synthesized. According to this, when the digital broadcast receiving device 1 normally receives without performing a channel search, the output (power) of the second receiving unit 50 can be used for the receiving process of the first receiving unit 11d. As a result, it is possible to reduce the deterioration of characteristics caused by the branching of the signal by the branching portion n1.
  • the intermediate signal s50 When the second receiving unit 50 is receiving the same channel as the first receiving unit 11d, when the intermediate signal s50 is output to the first receiving unit 11d, the intermediate signal s50 has a coefficient ⁇ (from 0 to 1). It may be output by multiplying by a smooth and monotonically increased coefficient). For example, when synthesizing the intermediate signal s50, the signal power may be temporarily increased in the first receiving unit 11d, which may affect the continuity of AGC (Automatic Gain Control) and demodulation processing. .. On the other hand, by multiplying the intermediate signal s50 by the coefficient ⁇ and outputting as described above, the signal power at the time of synthesis can be gradually increased, and the influence on AGC and demodulation processing can be mitigated.
  • AGC Automatic Gain Control
  • the coefficient ⁇ to be multiplied by the intermediate signal s50 may be a coefficient obtained by smoothly and monotonically decreasing from 1 to 0.
  • the signal power at the time of synthesis can be gradually reduced, and the influence on AGC and demodulation processing can be mitigated.
  • FIG. 6 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 4 of the first embodiment.
  • the digital broadcast receiving device 1 of the modification 4 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
  • one of the plurality of first receiving units 11a to 11d (for example, 11d) and the second receiving unit 50 are in the same channel of digital broadcasting at the time of normal reception.
  • the amplification signal s52 output from the first amplification unit 52 is output to the first reception unit 11d.
  • the amplification signal s52 is added to an adder provided between the first amplification unit 22 and the mixer unit 23.
  • the first receiving unit 11d performs reception processing based on the amplification signal s22 output from the first amplification unit 22 and the amplification signal s52 output from the first amplification unit 52 of the second reception unit 50.
  • the amplification signal s52 of the first amplification unit 52 of the second receiving unit 50 is first. It is output to the amplification signal s22 of the first amplification unit 22 of the reception unit 11d and synthesized. According to this, when the digital broadcast receiving device 1 normally receives without performing a channel search, the output (power) of the first amplification unit 52 can be used for the reception processing of the first receiving unit 11d. .. As a result, it is possible to reduce the deterioration of characteristics caused by the branching of the signal by the branching portion n1.
  • the adder is not limited to that, and if the adder is inside the tuner unit 21, it is located after the mixer unit 23 or. It may be arranged in the subsequent stage of the band filter 24 or the like.
  • FIG. 7 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 5 of the first embodiment.
  • the digital broadcast receiving device 1 of the modification 5 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
  • one of the plurality of first receiving units 11a to 11d (for example, 11d) and the second receiving unit 50 are in the same channel of digital broadcasting at the time of normal reception.
  • the digital signal s61 output from the AD conversion unit 61 of the second receiving unit 50 is output to the first receiving unit 11d.
  • the digital signal s61 is added to an adder provided between the AD conversion unit 31 and the demodulation unit 32.
  • the first receiving unit 11d performs reception processing based on the digital signal s31 output from the AD conversion unit 31 and the digital signal s61 output from the AD conversion unit 61 of the second receiving unit 50.
  • the digital signal s61 of the AD conversion unit 61 of the second receiving unit 50 is transmitted to the first receiving unit. It is output to the digital signal s31 of the AD conversion unit 31 of 11d and synthesized. According to this, when the digital broadcast receiving device 1 normally receives without performing a channel search, the output (power) of the AD conversion unit 61 can be used for the reception processing of the first receiving unit 11d. As a result, it is possible to reduce the deterioration of characteristics caused by the branching of the signal by the branching portion n1.
  • the output of the AD conversion unit 61 is added to the output of the AD conversion unit 31 is shown, but the present invention is not limited to this, and the output of the demodulation unit 32 may be added to the output of the demodulation unit 32. .. Further, the addition in the demodulation unit 32 may be performed after frequency conversion, rate conversion, before FFT conversion, or after FFT conversion.
  • FIG. 8 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 6 of the first embodiment.
  • the digital broadcast receiving device 1 of the modification 6 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
  • the second receiving unit 50 of the modification 6 outputs the second reception processing signal s2 to the first combining unit 33 and the second combining unit 34.
  • the second reception processing signal s2 is also output to the second error correction unit 36.
  • the first synthesis unit 33 is the plurality of first reception processing signals.
  • the first composite signal s33 is generated based on the sa to sd and the second reception processing signal s2.
  • the second synthesis unit 34 generates the second synthesis signal s34 based on the plurality of first reception processing signals sa to sd and the second reception processing signal s2.
  • the second receiving processing signal s2 of the second receiving unit 50 is transmitted to the first combining unit 33 and the first combining unit 33. Output to the second synthesis unit 34.
  • the first combined signal s33 and the second combined signal s34 can be generated by using the second reception processing signal s2. it can. As a result, it is possible to reduce the deterioration of characteristics caused by the branching of the signal by the branching portion n1.
  • FIG. 9 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 7 of the first embodiment.
  • the digital broadcast receiving device 1 of the modification 7 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
  • the branch portion n1 is provided in the diversity receiving unit 10.
  • the branching unit n1 can be provided in the LSI chip CP1, and the number of parts on the printed circuit board on which the LSI chip is mounted can be reduced. ..
  • the diversity receiving unit 10 and the second receiving unit 50 may be composed of one LSI chip, and the branching unit n1 may be provided inside the LSI chip.
  • the tuner unit 21, PLLA 12 and PLLB 13, and the tuner unit 51 may be configured by one LSI chip, and the branch unit n1 may be provided inside the LSI chip.
  • the tuner unit 21, PLLA 12 and PLLB 13 may be composed of one LSI chip, and the branch unit n1 may be provided inside the LSI chip.
  • FIG. 10 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 8 of the first embodiment.
  • the digital broadcast receiving device 1 of the modification 8 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
  • the second receiving unit 50 is a receiving unit added for performing a channel search and for receiving a VL signal in the VHF-Low band and a VH signal in the VHF-High band.
  • the second receiving unit 50 receives and processes the broadcast signal of the digital broadcast branched and input from the branching unit n1, or is input from the antenna 2h for VHF-Low band reception or VHF-High band reception.
  • the VL signal or VH signal is received and processed, and the second reception processing signal s2 is output.
  • the second receiving unit 50 includes a tuner unit 51, an AD conversion unit 61, and a demodulation unit 62. Further, the second receiving unit 50 includes a third amplifying unit 71 and a switching unit 72.
  • the tuner section 51 is composed of a first amplification section 52, a mixer section 53, a band filter 54, and a second amplification section 55.
  • the first amplification unit 52 amplifies the broadcast signal of the digital broadcast input from the branch unit n1, and outputs the amplified signal s52 obtained by amplifying the amplification signal s52 to the mixer unit 53 via the switching unit 72.
  • the third amplification unit 71 amplifies the input VL signal or VH signal, and outputs the amplified signal obtained by amplification to the mixer unit 53 via the switching unit 72.
  • the switching unit 72 is a switch that can be selectively switched, and its operation is controlled by, for example, the main controller 4.
  • the signal amplified by the third amplification unit 71 is input to the mixer unit 53 by the operation of the switching unit 72.
  • the signal amplified by the first amplification unit 52 is input to the mixer unit 53 by the operation of the switching unit 72.
  • the switching unit 72 when the "terrestrial digital dedicated mode” is set, the switching unit 72 is connected to the first amplification unit 52 on the antenna 2d side, and when the "VL / VH dedicated mode” is set, the switching unit 72. Is connected to the third amplification unit 71 on the antenna 2h side.
  • the signal quality of the diversity receiving unit 10 is equal to or higher than a predetermined value and channel search is unnecessary in the state where the "VL / VH priority mode" is set, the signal quality is connected to the third amplification unit 71 on the antenna 2h side.
  • the signal quality of the diversity receiving unit 10 is lower than a predetermined value and channel search is required, the signal quality is connected to the first amplification unit 52 on the antenna 2d side.
  • the digital broadcast receiving device 1 of the present embodiment receives and processes digital broadcast broadcast signals input from a plurality of antennas 2a to 2d and outputs a plurality of first reception processed signals sa to sd.
  • the second reception unit 50 that receives and processes the input signal and outputs the second reception processing signal s2, and the second reception processing signal s2.
  • a second error correction unit 36 that performs a second error correction process on the processed signal processed based on the second reception processing signal s2 is provided.
  • the digital broadcast receiving device 1 since the digital broadcast receiving device 1 includes the second receiving unit 50 different from the first receiving units 11a to 11d, the channel search can be performed using the second receiving unit 50. Therefore, it is not necessary to use the first receiving units 11a to 11d when performing the channel search, and the first receiving units 11a to 11d can be used as the receiving unit for viewing, which is the original purpose. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
  • the second receiving unit 50 may use the broadcast signal as the input signal, perform a channel search on the input signal, and output the second reception processing signal s2.
  • the second receiving unit 50 outputs the second reception processing signal s2 by the channel search, so that it is not necessary to use the first receiving units 11a to 11d when performing the channel search, and the first receiving unit 11a ⁇ 11d can be used as a receiving unit for viewing, which is the original purpose. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
  • the digital broadcast receiving device 1 may further include a channel information acquisition unit 40 that acquires channel information of digital broadcasting based on the signal output from the second error correction unit 36.
  • the digital broadcast receiving device 1 with the channel information acquisition unit 40, it is possible to appropriately acquire the channel information when performing the channel search.
  • the channel information for example, when the reception quality of the channel of the predetermined relay station 6a deteriorates, the receiving channel can be switched to the channel of the relay station 6b having high reception quality.
  • the channel to be received can be quickly switched to the channel of another relay station having stable reception quality while suppressing deterioration of the reception characteristics of digital broadcasting.
  • the second receiving unit 50 may use the broadcast signal input from at least one of the plurality of antennas 2a to 2d as the input signal and perform reception processing.
  • the channel search can be performed using the second receiving unit 50 without increasing the number of antennas.
  • the second receiving unit 50 may use the broadcast signal input from another antenna 2e different from the plurality of antennas 2a to 2d as the input signal and perform reception processing.
  • the channel search can be performed using the independent antenna 2e. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
  • the first error correction unit 35 performs the first error correction processing at the time of channel search for searching the channel frequency of digital broadcasting and at the time of normal reception for receiving digital broadcasting without channel search.
  • the second error correction unit 36 may perform the second error correction processing at the time of channel search, and may not perform the second error correction processing at the time of normal reception.
  • the digital broadcast receiving device 1 further synthesizes at least two of the plurality of first reception processing signals sa to sd output from the plurality of first receiving units 11a to 11d and outputs the second combined signal s34.
  • the second synthesis unit 34 includes the second synthesis unit 34, the second synthesis unit 34 outputs the second synthesis signal s34 to the second error correction unit 36, and the second error correction unit 36 receives the second reception processing signal s2 and A second error correction process may be performed on each of the second composite signals s34.
  • the second error correction unit 36 performs error correction processing on each of the second reception processing signal s2 and the second composite signal s34, so that the output for normal viewing and the output of the channel search result are output. Each of these can be done properly. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
  • the first error correction unit 35 refers to the first composite signal s33 at the time of channel search for searching the channel frequency of digital broadcasting and at the time of normal reception for receiving digital broadcasting without channel search.
  • the first error correction processing is performed
  • the second error correction unit 36 performs the second error correction processing on the second reception processing signal s2 at the time of channel search, and performs the second error correction processing on the second composite signal s34 at the time of normal reception.
  • a second error correction process may be performed.
  • the second error correction unit 36 performs error correction processing on the second reception processing signal s2 at the time of channel search, and performs error correction processing on the second composite signal s34 at the time of normal reception.
  • Appropriate output can be performed by error correction processing at the time of channel search and at the time of normal reception. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
  • the second receiving unit 50 further outputs the second reception processing signal s2 to the first combining unit 33 and the second combining unit 34, and at the time of normal reception, the plurality of first receiving units 11a to 11d and
  • the first combining unit 33 is the first based on the plurality of first receiving processing signals sa to sd and the second receiving processing signal s2.
  • the composite signal s33 may be generated, and the second synthesis unit 34 may generate the second composite signal s34 based on the plurality of first reception processing signals sa to sd and the second reception processing signal s2.
  • each of the first composite signal s33 and the second composite signal s34 by using both the first reception processing signals sa to sd and the second reception processing signal s2. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
  • the second receiving unit 50 at the time of normal reception, one of the plurality of first receiving units 11a to 11d (for example, 11d) and the second receiving unit 50 transmit the same channel frequency of digital broadcasting.
  • the intermediate signal s50 transmitted in the second receiving unit 50 is output to the one first receiving unit 11d, and the one first receiving unit 11d is transmitted from the antenna (for example, 2d).
  • Reception processing may be performed based on the input broadcast signal and the intermediate signal s50.
  • the signal in the first receiving unit 11d but also the intermediate signal s50 of the second receiving unit 50 can be used to perform the reception processing of the first receiving unit 11d.
  • the intermediate signal s50 of the second receiving unit 50 can be used to perform the reception processing of the first receiving unit 11d.
  • each of the first receiving unit (for example, 11d) and the second receiving unit 50 has amplification units 22 and 52 that amplify and output the broadcast signal, and the second receiving unit 50 receives the second reception.
  • the amplification signal s52 output from the amplification unit 52 of the unit 50 is output to the first reception unit 11d, and the first reception unit 11d is output from the amplification unit 22 of the first reception unit 11d.
  • Reception processing may be performed based on the amplified signal s22 and the amplified signal s52 output from the amplified unit 52 of the second receiving unit 50.
  • the amplified signal s22 of the first receiving unit 11d can be used to perform the reception processing of the first receiving unit 11d.
  • the amplified signal s52 of the second receiving unit 50 can be used to perform the reception processing of the first receiving unit 11d.
  • each of the first receiving unit (for example, 11d) and the second receiving unit 50 has AD conversion units 31 and 61 that convert an analog signal into a digital signal in the receiving process, and the second receiving unit 50
  • the digital signal s61 output from the AD conversion unit 61 of the second receiving unit 50 is output to the one first receiving unit 11d, and the one first receiving unit 11d is the AD of the one first receiving unit 11d.
  • Reception processing may be performed based on the digital signal s31 output from the conversion unit 31 and the digital signal s61 output from the AD conversion unit 61 of the second receiving unit 50.
  • the digital signal s31 of the first receiving unit 11d can be used to perform the reception processing of the first receiving unit 11d.
  • the digital signal s61 of the second receiving unit 50 can be used to perform the reception processing of the first receiving unit 11d.
  • the second receiving unit 50 receives and processes the VL signal or VH signal input from the antenna 2h for VHF-Low band reception or VHF-High band reception, or among a plurality of antennas 2a to 2d.
  • the broadcast signal of the terrestrial digital broadcast input from one antenna (for example, 2d) may be received and processed.
  • channel search can be performed and VL signals and VH signals can be received with a small circuit scale.
  • first receiving units 11a to 11d a plurality of first receiving units 11a to 11d, a first combining unit 33, a first error correcting unit 35, a second receiving unit 50, and a second error correcting unit 36 are included in one LSI chip CP1. May be.
  • a branch portion n1 for extracting power from the antenna (for example, 2d) to the second receiving unit 50 can be provided in the LSI chip CP1, and the LSI chip CP1 constituting the digital broadcast receiving device 1 can be provided.
  • the printed circuit board on which the device is mounted can be simplified.
  • Embodiment 2 [2-1. Configuration of digital broadcast receiver]
  • the digital broadcast receiving device 1A according to the second embodiment will be described.
  • an example of removing noise from a signal transmitted in the first receiving unit 11a based on a signal including noise information received and processed by the second receiving unit 50 will be described.
  • FIG. 11 is a diagram showing the configuration of the conventional digital broadcast receiving device 101.
  • the conventional digital broadcast receiving device 101 includes a first receiving unit 11a and a first error correcting unit 35.
  • the first receiving unit 11a receives and processes the broadcast signal of the digital broadcast input from the antenna 2a and outputs the first reception processing signal sa.
  • the first error correction unit 35 performs the first error correction processing on the first reception processing signal sa, and outputs the signal after the error correction processing to the video / audio output unit 3a.
  • the first receiving unit 11a In the conventional digital broadcast receiving device 101, in order to reduce the influence of interference waves (for example, impulse noise, spurious noise, etc.) generated in the vehicle, the first receiving unit 11a has a circuit for noise removal and noise reduction. It is implemented. However, it has been difficult to appropriately remove the signal component of the interfering wave from the signal in which the digital broadcasting wave and the interfering wave are mixed, which is input from one antenna 2a.
  • interference waves for example, impulse noise, spurious noise, etc.
  • the digital broadcast receiving device 1A has the following configuration in order to appropriately remove the input interference wave (noise).
  • FIG. 12 is a diagram showing the configuration of the digital broadcast receiving device 1A according to the second embodiment. Note that FIG. 12 also shows an antenna 2a to which a broadcast signal such as a digital broadcast is input, an antenna 2j to which an interfering wave is input, and a video / audio output unit 3a for outputting video / audio.
  • a broadcast signal such as a digital broadcast
  • an antenna 2j to which an interfering wave is input
  • a video / audio output unit 3a for outputting video / audio.
  • the antenna 2j is another antenna different from the antenna 2a, and is arranged near a noise source (noise generating device) that emits an interfering wave. For example, an interfering wave generated outside the digital broadcast receiving device 1A is input to the antenna 2j.
  • a noise source noise generating device
  • the digital broadcast receiving device 1A includes a first receiving unit 11a, a first error correcting unit 35, and a second receiving unit 50. Further, the digital broadcast receiving device 1A includes PLLA 12 and PLLB 13.
  • the broadcast signal of the digital broadcast input from the first receiving unit 11a and the antenna 2a is received and processed, and the first reception processing signal sa is output.
  • the first receiving unit 11a includes a tuner unit 21, an AD conversion unit 31, and a demodulation unit 32.
  • the tuner unit 21 is composed of a first amplification unit 22, a mixer unit 23, a band filter 24, and a second amplification unit 25, as in the first embodiment.
  • the AD conversion unit 31 converts the analog signal amplified by the second amplification unit 25 into a digital signal s31 and outputs it to the demodulation unit 32.
  • the demodulation unit 32 demodulates the digital signal s31 and outputs the first reception processing signal sa which is the output signal of the first reception unit 11a.
  • the demodulation unit 32 of the present embodiment includes a noise removal unit 80 for removing noise from the signal transmitted in the first reception unit 11a. The details of the noise removing unit 80 will be described later.
  • the first error correction unit 35 performs the first error correction processing on the first reception processing signal sa, and outputs the signal after the error correction processing to the video / audio output unit 3a.
  • the first error correction unit 35 may perform decoding processing.
  • the second receiving unit 50 is a receiving unit added to input an externally generated interfering wave.
  • the second receiving unit 50 receives and processes the signal input by the interference wave, and outputs the second reception processing signal s2 including the noise information to the first receiving unit 11a.
  • the second receiving unit 50 includes a tuner unit 51, an AD conversion unit 61, and a demodulation unit 62.
  • the tuner section 51 is composed of a first amplification section 52, a mixer section 53, a band filter 54, and a second amplification section 55, as in the first embodiment.
  • the AD conversion unit 61 converts the analog signal amplified by the second amplification unit 55 into a digital signal s61 and outputs it to the demodulation unit 62.
  • the demodulation unit 62 demodulates the digital signal s61 and outputs the second reception processing signal s2, which is the output signal of the second reception unit 50, to the demodulation unit 32 of the first reception unit 11a.
  • the demodulation unit 32 of the first receiving unit 11a includes a noise removing unit 80.
  • the digital broadcast receiving device 1A uses the second reception processing signal s2 output from the second receiving unit 50 to remove noise from the signal transmitted in the first receiving unit 11a.
  • the digital broadcast receiving device 1A of the present embodiment uses the second reception processing signal s2 output from the second receiving unit 50, and makes noise with respect to the signal transmitted in the first receiving unit 11a. Perform removal. As a result, it is possible to prevent the digital broadcast receiving device 1A from deteriorating the reception characteristics of the digital broadcast.
  • FIG. 13 is a diagram showing the configuration of the noise removing unit 80 of the digital broadcast receiving device 1A.
  • the noise removing unit 80 removes noise from the digital information signal s32 after the demodulation processing by the demodulation unit 32, so that the noise removing signal s82 after the noise is removed is sent to the first error correction unit 35. Output.
  • the noise removing unit 80 has a signal adjusting unit 81 and an addition / subtraction unit 82.
  • the second reception processing signal s2 including the noise information output from the second reception unit 50 is input to the signal adjustment unit 81.
  • the signal adjusting unit 81 adjusts (corrects) at least one of the amplitude, phase, and timing of the second reception processing signal s2, and outputs the adjusted noise information signal s81 to the addition / subtraction unit 82.
  • the digital information signal s32 after the demodulation processing by the demodulation unit 32 and the noise information signal s81 after adjustment are input to the addition / subtraction unit 82.
  • the addition / subtraction unit 82 subtracts the adjusted noise information signal s81 from the digital information signal s32, and outputs the noise removal signal s82. In this way, the noise removing unit 80 performs noise removing processing based on the second reception processing signal s2 including noise information, and outputs the processed processing signal to the first error correction unit 35.
  • the noise removing unit 80 adjusts by giving a correction coefficient that cancels out noise, for example, so that the reception quality after noise removal is improved. May be good. Further, the noise removing unit 80 may make the above adjustment based on a correction coefficient calculated in advance from the arrangement relationship between the antenna 2j and the noise source (noise generating device).
  • FIG. 14 is a diagram showing a detailed configuration of the noise removing unit 80 shown in FIG.
  • the signal adjusting unit 81 has a filter unit 81a having a filter coefficient and a correlation unit 81b for obtaining a correlation.
  • Figure 14 is a digital information signal s32 is indicated by the signal f 1 (t), the second reception processing signal s2 containing noise information is indicated by the signal f 5 (t), the adjusted noise information signal s81 signal It is indicated by F 5 (t), and the noise reduction signal s82 is indicated by a signal (f 1 (t) -F 5 (t)).
  • the filter unit 81a the signal f 5 containing noise information (t) is input.
  • Filter unit 81a adjusts the amplitude, at least one of phase and timing for the signal f 5 (t) based on the filter coefficients to be appropriately updated, the signal F 5 is a noise information signal after adjustment (t) Is output to the addition / subtraction unit 82.
  • a signal F 5 (t) and a signal f 1 (t), which is a digital information signal, are input to the addition / subtraction unit 82.
  • Subtraction unit 82 by subtracting the signal F 5 (t) from the signal f 1 (t), and generates a signal which is a noise reduction signal (f 1 (t) -F 5 (t)).
  • the correlation unit 81b correlates the signal (f 1 (t) -F 5 (t)) with the signal f 5 (t), and outputs the filter coefficient corresponding to the correlation to the filter unit 81a. Specifically, as shown in (Equation 1), the correlation unit 81b multiplies the signal (f 1 (t) ⁇ F 5 (t)) by the signal f 5 (t) to correlate e (m). , T) is calculated.
  • the correlation unit 81b determines the filter coefficient so that the correlation (m, t) between the signal (f 1 (t) ⁇ F 5 (t)) and the signal f 5 (tm) disappears.
  • the correlation disappears, it means that the signal f 5 (t) containing the noise information is not included in the signal from which the noise has been removed (f 1 (t) -F 5 (t)).
  • the filter coefficient can be obtained by calculation using an adaptive filter such as MMSE (Minimum Mean Square), LMS (Least Mean Square), or RLS (Recursive First Square).
  • the correlation unit 81b obtains a plurality of correlations based on (Equation 1) represented by a plurality of taps, derives a plurality of filter coefficients ct + 1 (m) as shown in (Equation 2), and sends them to the filter unit 81a. Output.
  • Filter unit 81a based on the input filter coefficient, and adjusts the signal f 5 (t), and outputs the signal F 5 a (t).
  • the noise removing unit 80 repeats these processes at a predetermined time, and updates the filter coefficient so that the correlation between the signal (f 1 (t) ⁇ F 5 (t)) and the signal f 5 (tm) disappears. .. As a result, the noise removing unit 80 executes the noise removing process.
  • ⁇ in (Equation 2) is a predetermined step size. Increasing the step size ⁇ increases the speed of convergence and followability, but the fluttering increases and the error remaining after convergence increases.
  • the step size ⁇ is appropriately set according to the followability and the magnitude of the residual error required for the digital broadcast receiving device 1A.
  • the filter coefficient is updated so that there is no correlation between the signal (f 1 (t) -F 5 (t)) and the signal f 5 (tm), but the noise is not limited to this.
  • the filter coefficient may be updated based on the reception quality after removal (guard correlation or modulation error ratio of the received signal).
  • the filter coefficient is updated sequentially, but when the signal after noise removal meets a predetermined reception quality value, the update of the filter coefficient may be stopped, and the step size for updating the filter coefficient is set to the current step size. It may be smaller.
  • the addition / subtraction unit 82 is a subtractor for subtracting the adjusted noise information signal s81 from the digital information signal s32, but the present invention is not limited to this.
  • the addition / subtraction unit 82 may be an adder.
  • the noise removing unit 80 removes noise from the digital information signal s32 demodulated by the demodulating unit 32 , but the present invention is not limited to this.
  • the noise removing unit 80 removes noise from a frequency-converted signal (correction of carrier frequency deviation and conversion of an intermediate frequency signal to a baseband) or rate-converted (sampling timing correction) signal. Alternatively, noise removal may be performed on the signal before frequency conversion. Further, the noise removing unit 80 may remove noise from the signal before the FFT (Fast Fourier Transform) conversion or after the FFT conversion.
  • FFT Fast Fourier Transform
  • the noise removing unit 80 does not always operate, but may perform an intermittent operation such that it operates at each time to remove noise. Further, the noise removing unit 80 performs an intermittent operation, outputs a noise removing signal s82 during the operating period of the intermittent operation, and outputs a digital information signal s32 without performing noise removing during the non-operating period of the intermittent operation. You may. Further, although the noise removing unit 80 always operates, the coefficient may be updated intermittently.
  • FIG. 15 is a diagram showing an example of noise input to the digital broadcast receiving device 1A.
  • FIG. 15 shows an example in which vehicle-mounted noise is generated in a period of x ( ⁇ s) and y ( ⁇ s).
  • the noise removing unit 80 may perform noise removal in accordance with the intermittently generated noise. During the period when noise is not generated, the noise removing unit 80 may stop the noise removing operation so as not to accidentally remove the necessary signal. Further, the noise removing unit 80 may set a threshold value for the intensity of the noise to be removed, and remove the noise when the noise exceeding the threshold value is generated.
  • the period during which the noise removing unit 80 operates may be when the signal level input to the second receiving unit 50 is higher than a predetermined value, or the signal quality value of the second receiving unit 50 is predetermined. It may be less than the value. Further, it may be when the signal quality value of the first receiving unit 11a shows a value larger than a predetermined value. Further, the noise removing unit 80 may operate intermittently by predicting the noise generation cycle and duration.
  • the digital broadcast receiving device 1A of the second embodiment receives and processes the broadcast signal of the digital broadcast input from the antenna 2a and outputs the first reception processing signal sa, and the antenna 2a and the first receiving unit 11a.
  • a second receiving unit 50 that receives and processes a signal input from an antenna 2j different from the above and outputs a second reception processing signal s2 to the first receiving unit 11a.
  • the second receiving unit 50 receives and processes the signal input by the interference wave generated externally, and outputs the second receiving processing signal s2 including the noise information to the first receiving unit 11a.
  • the first receiving unit 11a performs reception processing based on the broadcast signal input from the antenna 2a and the second reception processing signal s2 output from the second receiving unit 50, and first receives the processed signal after the reception processing. Output as a processing signal sa.
  • the first error correction unit 35 performs the first error processing on the first reception processing signal sa.
  • the digital broadcast receiving device 1A may include a plurality of first receiving units 11a to 11d (see FIG. 18) for performing diversity reception.
  • the second reception processing signal s2 is output from the second receiving unit 50 to each of the plurality of first receiving units 11a to 11d, and each of the plurality of first receiving units 11a to 11d has a plurality of antennas 2a to 2d.
  • Reception processing may be performed based on the broadcast signal input from (see FIG. 18) and the second reception processing signal s2 output from the second reception unit 50.
  • FIG. 16 is a diagram showing a part of the configuration of the digital broadcast receiving device 1A according to the first modification of the second embodiment.
  • the first receiving unit 11a includes a signal selection unit 90 in addition to the noise removing unit 80.
  • the signal selection unit 90 is provided on the output side of the noise removal unit 80, that is, between the noise removal unit 80 and the first error correction unit 35.
  • the signal selection unit 90 includes reception quality determination units 91a and 91b, a comparison unit 92, and a switching unit 93.
  • the reception quality determination unit 91a determines the reception quality of the digital information signal s32 that has not been subjected to the noise removal processing, and the reception quality determination unit 91b is the noise removal signal s82 that has been subjected to the noise removal processing by the noise removal unit 80.
  • Judge the reception quality The criteria for determining the reception quality are set in advance by, for example, a five-step evaluation in consideration of the signal strength and noise in a predetermined frequency band.
  • the comparison unit 92 compares the determination results of the reception quality determination units 91a and 91b, and controls the operation of the switching unit 93.
  • the switching unit 93 is a switch that can be selectively switched by the comparison unit 92, and is provided between the noise removing unit 80 and the first error correction unit 35. Based on the determination result, the comparison unit 92 sets the higher signal reception quality as the output of the signal selection unit 90. For example, when the comparison unit 92 determines that the digital information signal s32 has higher signal reception quality than the noise removal signal s82, the comparison unit 92 operates the switching unit 93 so that the digital information signal s32 is output. Further, when the comparison unit 92 determines that the noise removal signal s82 has higher signal reception quality than the digital information signal s32, the comparison unit 92 operates the switching unit 93 so that the noise removal signal s82 is output.
  • the output signal of the signal selection unit 90 is output to the first error correction unit 35 as the first reception processing signal sa of the first reception unit 11a. According to this configuration, stable reception quality can be ensured even in a situation where it is not necessary to perform noise removal or a situation in which reception quality is rather deteriorated by performing noise removal.
  • the reception quality determination units 91a and 91b may determine the reception quality based on the carrier-to-noise ratio (C / N (C / I)) of the signal. Further, the reception quality determination units 91a and 91b may determine the reception quality from the correlation amount between the guard interval in the OFDM (Orthogonal Frequency Division Multiplexing) time domain and the copy portion, or the reception signal in the frequency domain after FFT. The reception quality may be determined by MER or the like.
  • FIG. 17 is a diagram showing the configuration of the digital broadcast receiving device 1A according to the second modification of the second embodiment.
  • the first receiving unit 11a provides the synchronization information for synchronizing the operation of the second receiving unit 50 with the operation of the first receiving unit 11a. Output to the receiving unit 50. Specifically, the demodulation unit 32 of the first reception unit 11a outputs the above synchronization information to the demodulation unit 62 of the second reception unit 50. The second receiving unit 50 performs reception processing based on the received synchronization information.
  • the synchronization information includes information on the amount of carrier frequency deviation and the amount of sampling deviation in the signal during normal reception.
  • the antenna 2j connected to the second receiving unit 50 is arranged mainly for receiving the interfering wave, the signal power of the terrestrial digital broadcasting is low, and the carrier frequency is synchronized or sampled with respect to the digital broadcasting. It may be difficult to synchronize. Therefore, by outputting the synchronization information including the carrier frequency deviation amount and the sampling deviation amount acquired by the first receiving unit 11a to the second receiving unit 50, the carrier frequency synchronization and sampling are performed by the second receiving unit 50. Can be synchronized.
  • the digital broadcast receiving device 1A of the present embodiment has a first receiving unit 11a that receives and processes a digital broadcast broadcast signal input from the antenna 2a and outputs a first reception processing signal sa, and an antenna different from the antenna 2a.
  • a second receiving unit 50 that receives and processes the signal input from 2j and outputs the second reception processing signal s2 to the first receiving unit 11a is provided.
  • the first receiving unit 11a performs reception processing based on the broadcast signal input from the antenna 2a and the second reception processing signal s2 output from the second receiving unit 50, and first receives the processed signal after the reception processing. Output as a processing signal sa.
  • the error correction unit 35 performs error processing on the first reception processing signal sa.
  • the reception characteristics of digital broadcasting can be improved. Deterioration can be suppressed.
  • the second receiving unit 50 uses the signal input by the disturbing wave generated externally as the input signal, performs reception processing, and sends the second reception processing signal s2 including noise information to the first receiving unit 11a. It may be output.
  • the second receiving unit 50 receives and processes the signal input by the interference wave and outputs the second receiving processing signal s2, so that the first receiving unit 11a performs the second receiving processing including noise information. Noise can be removed by using the signal s2. As a result, it is possible to suppress deterioration of the reception characteristics of the digital broadcast in the first receiving unit 11a.
  • the second receiving unit 50 may use the signal input from another antenna 2j located closer to the noise source than the plurality of antennas 2a to 2d as the input signal and perform reception processing.
  • the second receiving unit 50 receives and processes the signal input from the other antenna 2j located near the noise source and outputs the second receiving processing signal s2, so that the first receiving unit 11a , Noise can be removed by using the second reception processing signal s2 including noise information. As a result, it is possible to suppress deterioration of the reception characteristics of the digital broadcast in the first receiving unit 11a.
  • each of the plurality of first receiving units 11a to 11d has a noise removing unit 80 that removes noise from the digital information signal s32 after the demodulation processing by the first receiving units 11a to 11d.
  • the unit 80 may output the processed signal processed based on the second reception processing signal s2 by performing noise removal based on the second reception processing signal s2 including the noise information.
  • the noise removing unit 80 subtracts the adjusted noise information signal s81 after adjusting at least one of the amplitude, phase and timing with respect to the second reception processing signal s2 including the noise information from the digital information signal s32. Then, noise may be removed.
  • noise can be reliably removed by the noise removing unit 80, and deterioration of the reception characteristics of digital broadcasting can be suppressed.
  • the noise removing unit 80 has a filter unit 81a having a filter coefficient, and the filter unit 81a has at least an amplitude, a phase, and a timing with respect to the second reception processing signal s2 including noise information based on the filter coefficient. By adjusting one of them, the adjusted noise information signal s81 may be generated.
  • the noise information signal s81 after adjustment for performing noise removal can be appropriately generated. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
  • the noise removing unit 80 has a correlation unit 81b
  • the correlation unit 81b is a second reception process including the noise removing signal s82 after removing the adjusted noise information signal s81 from the digital information signal s32 and the noise information. It may correlate with the signal s2 and output the filter coefficient corresponding to the correlation to the filter unit 81a.
  • the filter coefficient required for noise removal can be appropriately obtained. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
  • the filter coefficient may be obtained by an operation using an adaptive filter.
  • the filter coefficient can be appropriately obtained. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
  • the adaptive filter may be MMSE (Minimum Mean Square Error), LMS (Least Mean Square), or RLS (Recursive Last Square).
  • MMSE Minimum Mean Square Error
  • LMS Least Mean Square
  • RLS Recursive Last Square
  • the filter coefficient can be appropriately obtained. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
  • the first receiving unit 11a may output the higher signal reception quality of the digital information signal s32 and the noise removing signal s82 to the first combining unit 33 as the first receiving processing signal sa.
  • the noise removing unit 80 performs an intermittent operation, outputs a noise removing signal s82 during the operating period of the intermittent operation, and outputs a digital information signal s32 without performing noise removing during the non-operating period of the intermittent operation. You may.
  • the first receiving unit 11a may output synchronization information for synchronizing the operation of the second receiving unit 50 with the operation of the first receiving unit 11a to the second receiving unit 50.
  • the operation of the second receiving unit 50 can be synchronized with the operation of the first receiving unit 11a, and the second receiving unit 50 sends the second reception processing signal s2 to the first receiving unit 11a at an appropriate timing. Can be output to.
  • the first receiving unit 11a can perform reception processing at an appropriate timing and suppress deterioration of the reception characteristics of digital broadcasting.
  • the digital broadcast receiving device 1B according to the third embodiment will be described.
  • the digital broadcast receiving device 1B according to the third embodiment has a form in which the first embodiment and the second embodiment are combined.
  • FIG. 18 is a diagram showing the configuration of the digital broadcast receiving device 1B according to the third embodiment. Note that FIG. 18 also shows a plurality of antennas 2a, 2b, 2c, 2d for inputting broadcast signals such as digital broadcasting, and video / audio output units 3a, 3b for outputting video / audio.
  • the digital broadcast receiving device 1B includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
  • the diversity receiving unit 10 includes a plurality of first receiving units 11a, 11b, 11c, 11d, a first synthesis unit 33, a second synthesis unit 34, a first error correction unit 35, and a second error correction unit 36. And a switching unit 75 is provided. Further, the diversity receiving unit 10 includes PLLA 12 and PLLB 13.
  • the plurality of first reception units 11a to 11d receive and process the broadcast signals of digital broadcasting input from the plurality of antennas 2a to 2d, and output the plurality of first reception processing signals sa, sb, sc, and sd.
  • Each of the first receiving units 11a to 11d includes a tuner unit 21, an AD conversion unit 31, and a demodulation unit 32.
  • the tuner section 21 is composed of a first amplification section 22, a mixer section 23, a band filter 24, and a second amplification section 25.
  • the AD conversion unit 31 converts the analog signal amplified by the second amplification unit 25 into a digital signal s31 and outputs it to the demodulation unit 32.
  • Each demodulation unit 32 demodulates the digital signal s31 and outputs the output signals of the first receiving units 11a to 11d.
  • the demodulation unit 32 of each of the first reception units 11a to 11d includes a noise removal unit 80.
  • the digital broadcast receiving device 1B uses the second reception processing signal s2 output from the second receiving unit 50 to remove noise from the signals transmitted in the first receiving units 11a to 11d.
  • the noise removing unit 80 removes noise from the digital information signal s32 after the demodulation processing by the demodulation unit 32, so that the noise removing signal s82 after the noise is removed is the first reception processing signals sa to sd. Output as.
  • the noise removing unit 80 may not perform noise removal at the time of channel search for searching the channel frequency of digital broadcasting, and may perform noise removal at the time of normal reception of receiving digital broadcasting without performing channel search.
  • the noise removing unit 80 may perform continuous operation or intermittent operation at the time of normal reception to remove noise.
  • the first synthesis unit 33 synthesizes at least two of the plurality of first reception processing signals sa to sd output from the plurality of first reception units 11a to 11d to generate the first composite signal s33.
  • the first synthesis unit 33 outputs the first synthesis signal s33 to the first error correction unit 35.
  • the first error correction unit 35 performs the first error correction process on the first composite signal s33.
  • the first error correction unit 35 performs the first error correction processing on the first composite signal s33 at each time of the channel search and the normal reception, and the signal after the error correction processing. Is output to the video / audio output unit 3a and the channel information acquisition unit 40.
  • the second synthesis unit 34 synthesizes at least two of the plurality of first reception processing signals sa to sd output from the plurality of first reception units 11a to 11d to generate the second composite signal s34.
  • the second synthesis unit 34 outputs the second synthesis signal s34 to the second error correction unit 36 via the switching unit 37.
  • the second receiving unit 50 has a function of performing a channel search and a function of receiving and processing an interfering wave.
  • the second receiving unit 50 performs a channel search when the reception quality of the broadcast signal of the digital broadcast falls below a predetermined reception quality value, and starts acquiring channel information. Further, the second receiving unit 50 receives and processes the signal input by the interference wave, and outputs the second receiving processing signal s2 including the noise information to the first receiving unit 11a.
  • the second receiving unit 50 receives and processes the broadcast signal of the digital broadcast branched and input from the branching unit n1 between the antenna 2d and the first receiving unit 11d, or the signal of the interfering wave input from the antenna 2j. Is received and processed, and the second reception processing signal s2 is output. Switching of the reception processing of these two signals is executed by the operation of the switching unit 75.
  • the second receiving unit 50 includes a switching unit 75, a tuner unit 51, an AD conversion unit 61, and a demodulation unit 62.
  • the switching portion 75 is provided between the branch portion n1 and the antenna 2j and the tuner portion 51.
  • the switching unit 75 operates so that the tuner unit 51 is connected to the antenna 2d via the branch unit n1 and inputs an interfering wave to the second receiving unit 50.
  • the tuner portion 51 operates so as to be connected to the antenna 2j.
  • the tuner section 51 is composed of a first amplification section 52, a mixer section 53, a band filter 54, and a second amplification section 55.
  • the AD conversion unit 61 converts the analog signal amplified by the second amplification unit 55 into a digital signal s61 and outputs it to the demodulation unit 62.
  • the demodulation unit 62 demodulates the digital signal s61 and outputs the second reception processing signal s2, which is the output signal of the second reception unit 50.
  • the second reception unit 50 outputs the second reception processing signal s2 to the second error correction unit 36 via the switching unit 37.
  • the second error correction unit 36 performs a second error correction process on each of the second composite signal s34 and the second reception processing signal s2.
  • the second error correction unit 36 is connected to the second synthesis unit 34 by the operation of the switching unit 37 at the time of normal reception, performs the second error correction processing on the second synthesis signal s34, and performs error correction.
  • the processed signal is output to the video / audio output unit 3b.
  • the second error correction unit 36 is connected to the second reception unit 50 by the operation of the switching unit 37 at the time of channel search, performs the second error correction processing on the second reception processing signal s2, and performs error correction.
  • the processed signal is output to the channel information acquisition unit 40.
  • the second receiving unit 50 receives and processes the broadcast signal of the digital broadcast input from at least one antenna (for example, the antenna 2d) of the plurality of antennas 2a to 2d at the time of channel search, and receives the second reception processing signal. Output s2 to the second error correction unit 36.
  • the second receiving unit 50 receives and processes the signal input from the other antenna 2j at the time of normal reception, and outputs the second reception processing signal s2 including the noise information to the noise removing unit 80.
  • the input switching of the antenna 2d or the antenna 2j is performed by the operation of the switching unit 75.
  • the channel information acquisition unit 40 acquires channel information based on the signals output from the first error correction unit 35 and the second error correction unit 36.
  • the main controller 4 selects a channel to be received by the first receiving units 11a to 11d based on the acquired channel information, and instructs the first receiving units 11a to 11d to select the channel.
  • the main controller 4 instructs the second receiving unit 50 to select channels so that the channels when the second receiving unit 50 performs the channel search are changed in order.
  • the digital broadcast receiving device 1B of the present embodiment includes a second receiving unit 50 different from the first receiving units 11a to 11d, and performs a channel search using the second receiving unit 50. Therefore, it is not necessary to use the first receiving units 11a to 11d to perform the channel search, and the first receiving units 11a to 11d can be used as the receiving unit for viewing, which is the original purpose. Therefore, it is possible to suppress deterioration of the reception characteristics of digital broadcasting.
  • the digital broadcast receiving device 1B uses the second reception processing signal s2 output from the second receiving unit 50 to remove noise from the signal transmitted in the first receiving unit 11a. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
  • the second receiving unit when the second receiving unit is operated as a receiving unit for channel search, a signal from the antenna 2d is input by the operation of the switching unit 75, the demodulated signal is error-corrected by the second error-correcting unit, and the channel is processed. Get information.
  • the second receiving unit 50 when the second receiving unit 50 is operated as a receiving unit for noise removal, a signal from the antenna 2j is input by the operation of the switching unit 75, and based on the signal processed by the second receiving unit 50, the first unit is used. Noise is removed by each demodulation unit 32 of the reception units 11a to 11d.
  • the intermediate signal in the second receiving unit 50 is limited to the case where the second receiving unit 50 is receiving the same channel as the first receiving units 11a to 11d.
  • the s50 is output to the first receiving unit (for example, 11d), and the deterioration of the characteristics is compensated by combining or correcting.
  • Whether the second receiving unit 50 is operated for noise removal or for channel search may be determined by the reception quality of the signal in the diversity receiving unit 10. For example, a predetermined reception quality value is set as the reception quality, and when the reception quality is within the range of the predetermined reception quality value, it is operated for noise removal, and the reception quality is outside the range of the predetermined reception quality value and is within the predetermined reception quality. If it is less than the value, it may be operated for channel search.
  • the diversity receiving unit 10 and the second receiving unit 50 may be composed of one LSI chip.
  • the AD conversion unit 31, the demodulation unit 32, the first synthesis unit 33, the second synthesis unit 34, the first error correction unit 35 and the second error correction unit 36, and the AD conversion unit 61 and the demodulation unit 62. And may be composed of one LSI chip.
  • the tuner unit 21, PLLA 12 and PLLB 13, and the tuner unit 51 may be configured by one LSI chip.
  • the tuner unit 21, PLLA 12 and PLLB 13 may be composed of one LSI chip, the tuner unit 51 may be composed of one LSI chip, and at least two of the above LSI chips may be packaged.
  • the channel information acquisition unit 40 may be provided on any of the above LSI chips.
  • FIG. 19 is a diagram showing an example of an arrangement of antennas connected to the digital broadcast receiving device 1B.
  • 19 (a) and 19 (b) are examples of different antenna arrangements.
  • 19 (a) and 19 (b) show a state in which four antennas 2a to 2d for receiving digital broadcasting and antennas 2j for receiving interference waves are arranged on the moving body 5 which is a vehicle. Has been done.
  • the antenna 2j that receives the jamming wave is installed so that the noise level becomes larger than a predetermined value. At this time, it should be noted that the antenna 2j needs to receive the interference wave reaching the antennas 2a to 2d among the many interference waves existing, and must not receive a lot of other noise. ..
  • the antenna 2j is set so that the power ratio (D / U) between the terrestrial digital broadcasting signal and the noise is D / U ⁇ 0 (dB). It is installed, or the antenna 2j is installed so that the D / U value is lower than the D / U value of the antennas 2a to 2d.
  • the antenna 2j that receives the interference wave reaching the antennas 2a to 2d is arranged near the noise source (broken line shown in FIG. 19) and near the antennas 2a to 2d.
  • the antenna 2j is arranged near an intermediate point between the antenna group (front antenna group or rear antenna group) of the antennas 2a to 2d that is close to the noise source and the noise source.
  • the noise source is near the bonnet, and the antennas 2a and 2b of the antennas 2a to 2d are more strongly affected than the antennas 2c and 2d.
  • the antenna 2j is installed near the dashboard.
  • the noise source is located near the center of the vehicle body, and the antennas 2c and 2d of the antennas 2a to 2d are more strongly affected than the antennas 2a and 2d.
  • the antenna 2j is installed near the rear seat.
  • the noise source is a digital broadcast receiving device 1B main body, a radio device, a communication device such as ITS, LTE, ETC, ADAS, V2X, a recording / camera device such as a drive recorder or ADAS, a HID headlight, a door mirror. , Motors such as wipers, power lines, batteries for electric vehicles, and batteries for other equipment.
  • the antenna arrangement shown in FIG. 19 is an example, and all four antennas 2a to 2d may be arranged on the front antenna.
  • the tuner section 51 connected to the antenna 2j in order to correctly detect noise may select the same channel as the channel received by the antennas 2a to 2d, or may select a different channel.
  • the digital broadcast receiving device 1B of the present embodiment receives and processes digital broadcast broadcast signals input from a plurality of antennas 2a to 2d and outputs a plurality of first reception processed signals sa to sd.
  • the second reception unit 50 that receives and processes the input signal and outputs the second reception processing signal s2, and the second reception processing signal s2.
  • a second error correction unit 36 that performs a second error correction process on the processed signal processed based on the second reception processing signal s2 is provided.
  • the digital broadcast receiving device 1B has a second receiving unit 50 that receives and processes a signal input from an antenna 2j different from the antennas 2a to 2d and outputs a second receiving processing signal s2 to the first receiving unit 11a.
  • the first receiving unit 11a performs reception processing based on the broadcast signal input from the antenna 2a and the second reception processing signal s2 output from the second receiving unit 50, and first receives the processed signal after the reception processing. Output as a processing signal sa.
  • the digital broadcast receiving device 1 since the digital broadcast receiving device 1 includes the second receiving unit 50 different from the first receiving units 11a to 11d, the channel search can be performed using the second receiving unit 50. Therefore, it is not necessary to use the first receiving units 11a to 11d when performing the channel search, and the first receiving units 11a to 11d can be used as the receiving unit for viewing, which is the original purpose. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
  • the first It is possible to suppress deterioration of the reception characteristics of digital broadcasting in the receiving units 11a to 11d.
  • the noise removing unit 80 may not perform noise removal at the time of channel search for searching the channel frequency of digital broadcasting, and may perform noise removal at the time of normal reception of receiving digital broadcasting without performing channel search.
  • the second receiving unit 50 receives and processes the broadcast signal of the digital broadcast input from at least one of the plurality of antennas 2a to 2d at the time of channel search, and receives the second reception processing signal s2 as the second.
  • the signal may be output to the error correction unit 36, the signal input from the other antenna 2j at the time of normal reception may be received and processed, and the second reception processing signal s2 including the noise information may be output to the noise removal unit 80.
  • the second reception processing signal s2 output from the second reception unit 50 can be used for channel search or for noise removal. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
  • the noise removing unit 80 may perform continuous operation or intermittent operation at the time of normal reception to remove noise.
  • the other antenna 2j may be arranged substantially in the middle between one or more antennas of the plurality of antennas 2a to 2d closest to the noise source and the noise source.
  • the noise input to the antenna closest to the noise source among the plurality of antennas 2a to 2d can be input to the second receiving unit 50 using the antenna 2j.
  • noise can be removed from the signals transmitted in the first receiving units 11a to 11d by using the output signal including the noise information of the second receiving unit 50.
  • deterioration of the reception characteristics of digital broadcasting in the first receiving units 11a to 11d can be suppressed.
  • the digital broadcast receiving device has been described above based on the embodiment and the like, but the present disclosure is not limited to this embodiment.
  • another embodiment realized by arbitrarily combining the components described in the present specification and excluding some of the components may be the embodiment of the present disclosure.
  • the present disclosure also includes modifications obtained by making various modifications that can be conceived by those skilled in the art without departing from the gist of the present disclosure, that is, the meaning indicated by the wording described in the claims. Is done.
  • the first reception processing signals sa to sd are signals based on signals having the same channel frequency, but signals based on signals having different channel frequencies may be used.
  • the first reception processing signals sa and sb and the first reception processing signals sc and sd are signals based on signals having different channel frequencies, and the video / audio output from the video / audio output unit 3a and the video / audio The video / audio output from the audio output unit 3b may be different.
  • the terrestrial digital broadcasting has been described, but the digital broadcasting receiving device of the present embodiment is DVB-T, DVB-T2, DTMB, ATSC1.0 regardless of ISDB-T in Japan. , ATSC3.0, etc.
  • the digital broadcast receiving device of the present embodiment can be used for ISDB-Tmm, ISDB-Tsb, etc., regardless of terrestrial digital broadcasting, and may be used for each method of cable or satellite. It can be used not only for digital broadcasting but also for communication and radio.
  • the tuner unit 21 is composed of a first amplification unit, a mixer unit, a band filter, and a second amplification unit, but the configuration of the tuner unit is not limited to this.
  • the tuner unit may include other circuit devices that convert the desired channel frequency into an intermediate frequency or baseband.
  • a part of the components constituting the above digital broadcast receiving device may be a computer system composed of a microprocessor, ROM, RAM, hard disk unit, display unit, keyboard, mouse and the like.
  • a computer program is stored in the RAM or the hard disk unit.
  • the microprocessor achieves its function by operating according to the computer program.
  • a computer program is configured by combining a plurality of instruction codes indicating commands to a computer in order to achieve a predetermined function.
  • a part of the components constituting the above digital broadcast receiving device may be composed of one system LSI (Large Scale Integration: large-scale integrated circuit).
  • a system LSI is an ultra-multifunctional LSI manufactured by integrating a plurality of components on a single chip, and specifically, is a computer system including a microprocessor, ROM, RAM, and the like. ..
  • a computer program is stored in the RAM. When the microprocessor operates according to the computer program, the system LSI achieves its function.
  • Some of the components constituting the above digital broadcast receiving device may be composed of an IC card or a single module that can be attached to and detached from each device.
  • the IC card or the module is a computer system composed of a microprocessor, a ROM, a RAM, and the like.
  • the IC card or the module may include the above-mentioned super multifunctional LSI.
  • the microprocessor operates according to a computer program, the IC card or the module achieves its function. This IC card or this module may have tamper resistance.
  • some of the components constituting the digital broadcast receiving device include the computer program or a recording medium capable of reading the digital signal by a computer, for example, a flexible disk, a hard disk, a CD-ROM, an MO, and the like. It may be recorded on a DVD, DVD-ROM, DVD-RAM, BD (Blu-ray (registered trademark) Disc), semiconductor memory, or the like. Further, it may be the digital signal recorded on these recording media.
  • some of the components constituting the digital broadcast receiving device transmit the computer program or the digital signal via a telecommunication line, a wireless or wired communication line, a network represented by the Internet, data broadcasting, or the like. May be transmitted.
  • the present disclosure may be the method shown above. Further, it may be a computer program that realizes these methods by a computer, or it may be a digital signal composed of the computer program.
  • the present disclosure is a computer system including a microprocessor and a memory, in which the memory stores the computer program, and the microprocessor may operate according to the computer program. ..
  • Another independent computer by recording the program or the digital signal on the recording medium and transferring the program or the digital signal, or by transferring the program or the digital signal via the network or the like. It may be implemented by the system.
  • the digital broadcast receiving device of the present disclosure can be used as a broadcasting receiving device mounted on a moving body such as a vehicle.

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Abstract

A digital broadcast reception device (1) is provided with: a plurality of first reception units (11a to 11d) which subject broadcast signals of a digital broadcast inputted from a plurality of antennas (2a to 2d) to a reception process and outputs a plurality of first reception-processed signals (sa to sd); a first synthesizing unit (33) which synthesizes at least two of the plurality of first reception-processed signals (sa to sd) and outputs a first synthesized signal (s33); a first error-correction unit (35) which subjects the first synthesized signal (s33) to a first error-correction process; a second reception unit (50) which subjects an input signal to a reception process and outputs a second reception-processed signal (s2); and a second error-correction unit (36) which subjects the second reception-processed signal (s2), or a processed signal obtained by performing a process based on the second reception-processed signal (s2), to a second error-correction process.

Description

デジタル放送受信装置Digital broadcast receiver
　本開示は、デジタル放送を受信するデジタル放送受信装置に関する。 This disclosure relates to a digital broadcast receiving device that receives digital broadcasts.
　デジタル放送を配信する放送局のチャネルが各地域の中継局によって異なるため、車両などの移動体で同一放送局の番組を視聴する場合、移動体で受信するチャネルを各地域の中継局に対応したチャネルに適宜切り替える必要がある。そのため移動体では、現在位置にて受信可能なチャネルをサーチするチャネルサーチが行われる。例えば移動体に搭載されたデジタル放送受信装置では、所定の中継局のチャネルを受信して視聴する一方で、現在位置にて受信可能なチャネルをサーチし、サーチした結果をチャネル情報として保存する。これによれば、移動体の移動によって所定の中継局のチャネルの受信品質が低下した場合に、受信するチャネルを、受信品質が安定した他の中継局のチャネルに切り替えることができる。 Since the channel of the broadcasting station that distributes digital broadcasting differs depending on the relay station in each region, when watching a program of the same broadcasting station on a mobile body such as a vehicle, the channel received by the mobile body corresponds to the relay station in each region. You need to switch to the channel as appropriate. Therefore, in the mobile body, a channel search is performed to search for a channel that can be received at the current position. For example, in a digital broadcast receiving device mounted on a mobile body, while receiving and viewing a channel of a predetermined relay station, a receivable channel is searched at the current position, and the search result is saved as channel information. According to this, when the reception quality of the channel of a predetermined relay station deteriorates due to the movement of the mobile body, the receiving channel can be switched to the channel of another relay station having stable reception quality.
　特許文献１には、高周波信号を処理する複数の受信部を備えた受信装置が開示されている。この受信装置では、チャネルサーチを行う際に、複数の受信部のうちの一部の受信部を用いてチャネルサーチが行われ、残りの受信部を用いて視聴が行われる。 Patent Document 1 discloses a receiving device including a plurality of receiving units that process high-frequency signals. In this receiving device, when performing a channel search, a channel search is performed using some of the receiving units among the plurality of receiving units, and viewing is performed using the remaining receiving units.
特開２００５－１８４５４８号公報Japanese Unexamined Patent Publication No. 2005-184548
　しかしながら、特許文献１に開示された受信装置では、チャネルサーチを行う際に、一部の受信部がチャネルサーチのために使われ、視聴のために使われなくなる。そのため、デジタル放送の受信特性が劣化し、映像および音声の途絶が発生することがある。 However, in the receiving device disclosed in Patent Document 1, when performing a channel search, a part of the receiving unit is used for the channel search and is not used for viewing. Therefore, the reception characteristics of digital broadcasting may deteriorate, and video and audio may be interrupted.
　本開示は、デジタル放送の受信特性が劣化することを抑制するデジタル放送受信装置を提供することを目的とする。 An object of the present disclosure is to provide a digital broadcast receiving device that suppresses deterioration of the reception characteristics of digital broadcasting.
　本開示の一形態におけるデジタル放送受信装置は、複数のアンテナから入力されたデジタル放送の放送信号を受信処理して複数の第１受信処理信号を出力する複数の第１受信部と、前記複数の第１受信処理信号の少なくとも２つを合成して第１合成信号を出力する第１の合成部と、前記第１合成信号に対して第１の誤り訂正処理を行う第１の誤り訂正部と、入力された信号を受信処理して第２受信処理信号を出力する第２受信部と、前記第２受信処理信号に対してまたは前記第２受信処理信号に基づいて処理された処理信号に対して第２の誤り訂正処理を行う第２の誤り訂正部と、を備える。 The digital broadcast receiving device according to one embodiment of the present disclosure includes a plurality of first receiving units that receive and process digital broadcast broadcast signals input from a plurality of antennas and output a plurality of first reception processed signals, and the plurality of first receiving units. A first compositing unit that synthesizes at least two of the first received processing signals and outputs the first synthesized signal, and a first error correcting unit that performs a first error correction processing on the first synthesized signal. , For the second receiving unit that receives and processes the input signal and outputs the second reception processing signal, and for the processing signal processed for the second reception processing signal or based on the second reception processing signal. A second error correction unit that performs a second error correction process is provided.
　なお、これらの包括的又は具体的な態様は、システム、方法、集積回路、コンピュータプログラム又はコンピュータで読み取り可能なＣＤ－ＲＯＭなどの記録媒体で実現されてもよく、システム、方法、集積回路、コンピュータプログラム及び記録媒体の任意な組み合わせで実現されてもよい。 It should be noted that these comprehensive or specific embodiments may be realized in a system, method, integrated circuit, computer program or recording medium such as a computer-readable CD-ROM, and the system, method, integrated circuit, computer. It may be realized by any combination of a program and a recording medium.
　本開示のデジタル放送受信装置によれば、デジタル放送の受信特性が劣化することを抑制できる。 According to the digital broadcast receiving device of the present disclosure, it is possible to suppress deterioration of the reception characteristics of the digital broadcast.
図１は、実施の形態１に係るデジタル放送受信装置が搭載される移動体を示す図である。FIG. 1 is a diagram showing a mobile body on which the digital broadcast receiving device according to the first embodiment is mounted. 図２は、実施の形態１に係るデジタル放送受信装置の構成を示す図である。FIG. 2 is a diagram showing a configuration of a digital broadcast receiving device according to the first embodiment. 図３は、実施の形態１の変形例１に係るデジタル放送受信装置の構成を示す図である。FIG. 3 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 1 of the first embodiment. 図４は、実施の形態１の変形例２に係るデジタル放送受信装置の構成を示す図である。FIG. 4 is a diagram showing a configuration of a digital broadcast receiving device according to a second modification of the first embodiment. 図５は、実施の形態１の変形例３に係るデジタル放送受信装置の構成を示す図である。FIG. 5 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 3 of the first embodiment. 図６は、実施の形態１の変形例４に係るデジタル放送受信装置の構成を示す図である。FIG. 6 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 4 of the first embodiment. 図７は、実施の形態１の変形例５に係るデジタル放送受信装置の構成を示す図である。FIG. 7 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 5 of the first embodiment. 図８は、実施の形態１の変形例６に係るデジタル放送受信装置の構成を示す図である。FIG. 8 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 6 of the first embodiment. 図９は、実施の形態１の変形例７に係るデジタル放送受信装置の構成を示す図である。FIG. 9 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 7 of the first embodiment. 図１０は、実施の形態１の変形例８に係るデジタル放送受信装置の構成を示す図である。FIG. 10 is a diagram showing a configuration of a digital broadcast receiving device according to a modification 8 of the first embodiment. 図１１は、従来のデジタル放送受信装置の構成を示す図である。FIG. 11 is a diagram showing a configuration of a conventional digital broadcast receiving device. 図１２は、実施の形態２に係るデジタル放送受信装置の構成を示す図である。FIG. 12 is a diagram showing a configuration of a digital broadcast receiving device according to the second embodiment. 図１３は、実施の形態２に係るデジタル放送受信装置のノイズ除去部の構成を示す図である。FIG. 13 is a diagram showing a configuration of a noise removing unit of the digital broadcast receiving device according to the second embodiment. 図１４は、図１３に示すノイズ除去部の詳細構成を示す図である。FIG. 14 is a diagram showing a detailed configuration of the noise removing unit shown in FIG. 図１５は、実施の形態２に係るデジタル放送受信装置に入力されるノイズの一例を示す図である。FIG. 15 is a diagram showing an example of noise input to the digital broadcast receiving device according to the second embodiment. 図１６は、実施の形態２の変形例１に係るデジタル放送受信装置の構成の一部を示す図である。FIG. 16 is a diagram showing a part of the configuration of the digital broadcast receiving device according to the first modification of the second embodiment. 図１７は、実施の形態２の変形例２に係るデジタル放送受信装置の構成を示す図である。FIG. 17 is a diagram showing a configuration of a digital broadcast receiving device according to a second modification of the second embodiment. 図１８は、実施の形態３に係るデジタル放送受信装置の構成を示す図である。FIG. 18 is a diagram showing a configuration of a digital broadcast receiving device according to the third embodiment. 図１９は、デジタル放送受信装置に接続されるアンテナの配置の一例を示す図である。FIG. 19 is a diagram showing an example of an arrangement of antennas connected to a digital broadcast receiving device.
　以下、実施の形態について、図面を参照しながら具体的に説明する。なお、以下で説明する実施の形態は、いずれも本開示の一具体例を示すものである。以下の実施の形態で示される数値、形状、材料、構成要素、構成要素の配置位置及び接続形態、ステップ、ステップの順序などは、一例であり、本開示を限定する主旨ではない。また、以下の実施の形態における構成要素のうち、本開示の一形態に係る実現形態を示す独立請求項に記載されていない構成要素については、任意の構成要素として説明される。本開示の実現形態は、現行の独立請求項に限定されるものではなく、他の独立請求項によっても表現され得る。 Hereinafter, the embodiment will be specifically described with reference to the drawings. The embodiments described below are all specific examples of the present disclosure. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, etc. shown in the following embodiments are examples, and are not intended to limit the present disclosure. In addition, among the components in the following embodiments, the components not described in the independent claims indicating the embodiment according to the present disclosure will be described as arbitrary components. The embodiment of the present disclosure is not limited to the current independent claims, but may be expressed by other independent claims.
　なお、各図は模式図であり、必ずしも厳密に図示されたものではない。また、各図において、実質的に同一の構成に対しては同一の符号を付しており、重複する説明は省略または簡略化される場合がある。 Note that each figure is a schematic diagram and is not necessarily exactly illustrated. Further, in each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description may be omitted or simplified.
　（実施の形態１）
　［１－１．デジタル放送受信装置の構成］
　本実施の形態に係るデジタル放送受信装置の構成について、図１および図２を参照しながら説明する。 (Embodiment 1)
[1-1. Configuration of digital broadcast receiver]
The configuration of the digital broadcast receiving device according to the present embodiment will be described with reference to FIGS. 1 and 2.
　図１は、実施の形態１に係るデジタル放送受信装置１が搭載される移動体５を示す図である。 FIG. 1 is a diagram showing a mobile body 5 on which the digital broadcast receiving device 1 according to the first embodiment is mounted.
　デジタル放送受信装置１は、例えば車両などの移動体５に搭載される。デジタル放送受信装置１は、移動体５に搭載されたメインコントローラ４に接続され、必要に応じてメインコントローラ４によって制御される。 The digital broadcast receiving device 1 is mounted on a moving body 5 such as a vehicle. The digital broadcast receiving device 1 is connected to the main controller 4 mounted on the mobile body 5 and is controlled by the main controller 4 as needed.
　中継局６ａおよび６ｂは、放送局から配信されるデジタル放送を中継して送信する。図１に示す中継局６ａ、６ｂは、互いに異なる地域に設置され、同一放送局の同一番組を異なるチャネル周波数で送信している。移動体５が中継局６ａのサービスエリアから中継局６ｂのサービスエリアへ移動する途中において、ユーザに同一番組を継続して提供するためには、移動体５にて受信するチャネル周波数を適切に切り替える必要がある。 The relay stations 6a and 6b relay and transmit the digital broadcast delivered from the broadcasting station. The relay stations 6a and 6b shown in FIG. 1 are installed in different areas and transmit the same program of the same broadcasting station at different channel frequencies. In order to continuously provide the same program to the user while the mobile body 5 is moving from the service area of the relay station 6a to the service area of the relay station 6b, the channel frequency received by the mobile body 5 is appropriately switched. There is a need.
　そこで、デジタル放送受信装置１は、中継局６ａのチャネル周波数の信号を受信して映像・音声を出力しつつ、現在位置にて受信可能なチャネル周波数をサーチするチャネルサーチを行い、サーチ結果を保存する。そしてデジタル放送受信装置１は、中継局６ａのチャネル周波数の受信品質が低下した場合に、受信するチャネルを、受信品質の高い中継局６ｂのチャネル周波数に切り替える。 Therefore, the digital broadcast receiving device 1 receives the signal of the channel frequency of the relay station 6a, outputs video and audio, performs a channel search for searching the receivable channel frequency at the current position, and saves the search result. To do. Then, when the reception quality of the channel frequency of the relay station 6a deteriorates, the digital broadcast receiving device 1 switches the receiving channel to the channel frequency of the relay station 6b having a high reception quality.
　図２は、実施の形態１に係るデジタル放送受信装置１の構成を示す図である。なお、図２には、デジタル放送などの放送信号が入力される複数のアンテナ２ａ、２ｂ、２ｃ、２ｄ、および、映像・音声を出力する映像・音声出力部３ａ、３ｂも示されている。 FIG. 2 is a diagram showing the configuration of the digital broadcast receiving device 1 according to the first embodiment. Note that FIG. 2 also shows a plurality of antennas 2a, 2b, 2c, 2d for inputting broadcast signals such as digital broadcasting, and video / audio output units 3a, 3b for outputting video / audio.
　デジタル放送受信装置１は、ダイバーシティ受信部１０と、第２受信部５０と、を備えている。また、デジタル放送受信装置１は、チャネル情報取得部４０を備えている。 The digital broadcast receiving device 1 includes a diversity receiving unit 10 and a second receiving unit 50. Further, the digital broadcast receiving device 1 includes a channel information acquisition unit 40.
　ダイバーシティ受信部１０は、ダイバーシティ通信を行うための信号受信部である。ダイバーシティ受信部１０は、複数の第１受信部１１ａ、１１ｂ、１１ｃ、１１ｄ、第１の合成部３３、第２の合成部３４、第１の誤り訂正部３５、第２の誤り訂正部３６および切替部３７を備えている。また、ダイバーシティ受信部１０は、ＰＬＬＡ１２およびＰＬＬＢ１３を備えている。 The diversity receiving unit 10 is a signal receiving unit for performing diversity communication. The diversity receiving unit 10 includes a plurality of first receiving units 11a, 11b, 11c, 11d, a first synthesis unit 33, a second synthesis unit 34, a first error correction unit 35, a second error correction unit 36, and the like. A switching unit 37 is provided. Further, the diversity receiving unit 10 includes PLLA 12 and PLLB 13.
　複数の第１受信部１１ａ～１１ｄは、複数のアンテナ２ａ～２ｄから入力されたデジタル放送の放送信号を受信処理して複数の第１受信処理信号ｓａ、ｓｂ、ｓｃ、ｓｄを出力する。すなわち、第１受信部１１ａは、アンテナ２ａから入力された放送信号を受信処理して第１受信処理信号ｓａを出力する。第１受信部１１ｂは、アンテナ２ｂから入力された放送信号を受信処理して第１受信処理信号ｓｂを出力する。第１受信部１１ｃは、アンテナ２ｃから入力された放送信号を受信処理して第１受信処理信号ｓｃを出力する。第１受信部１１ｄは、アンテナ２ｄから入力された放送信号を受信処理して第１受信処理信号ｓｄを出力する。 The plurality of first reception units 11a to 11d receive and process the broadcast signals of digital broadcasting input from the plurality of antennas 2a to 2d, and output the plurality of first reception processing signals sa, sb, sc, and sd. That is, the first receiving unit 11a receives and processes the broadcast signal input from the antenna 2a and outputs the first reception processing signal sa. The first receiving unit 11b receives and processes the broadcast signal input from the antenna 2b and outputs the first reception processing signal sb. The first receiving unit 11c receives and processes the broadcast signal input from the antenna 2c and outputs the first reception processing signal sc. The first receiving unit 11d receives and processes the broadcast signal input from the antenna 2d and outputs the first reception processing signal sd.
　第１受信部１１ａ～１１ｄのそれぞれは、チューナ部２１、ＡＤ変換部３１および復調部３２を備えている。チューナ部２１は、第１の増幅部２２、ミキサ部２３、帯域フィルタ２４および第２の増幅部２５によって構成されている。 Each of the first receiving units 11a to 11d includes a tuner unit 21, an AD conversion unit 31, and a demodulation unit 32. The tuner section 21 is composed of a first amplification section 22, a mixer section 23, a band filter 24, and a second amplification section 25.
　第１の増幅部２２は、アンテナ２ａ、２ｂ、２ｃまたは２ｄから入力されたデジタル放送の放送信号を増幅し、増幅して得られた増幅信号ｓ２２をミキサ部２３へ出力する。また、ミキサ部２３には、ＰＬＬＡ１２もしくはＰＬＬＢ１３により、放送信号の周波数に応じた周波数信号が入力される。チューナ部２１は、増幅信号ｓ２２、ならびに、ＰＬＬＡ１２もしくはＰＬＬＢ１３から出力された周波数信号に応じて、ミキサ部２３および帯域フィルタ２４を制御して所定の周波数帯域のアナログ信号を生成する。第２の増幅部２５は、帯域フィルタ２４から出力されたアナログ信号を増幅して、ＡＤ変換部３１へ出力する。 The first amplification unit 22 amplifies the broadcast signal of the digital broadcast input from the antennas 2a, 2b, 2c or 2d, and outputs the amplified amplification signal s22 to the mixer unit 23. Further, a frequency signal corresponding to the frequency of the broadcast signal is input to the mixer unit 23 by the PLLA 12 or the PLLB 13. The tuner unit 21 controls the mixer unit 23 and the band filter 24 in accordance with the amplified signal s22 and the frequency signal output from the PLLA 12 or PLLB 13 to generate an analog signal having a predetermined frequency band. The second amplification unit 25 amplifies the analog signal output from the band filter 24 and outputs it to the AD conversion unit 31.
　ＡＤ変換部３１は、第２の増幅部２５で増幅されたアナログ信号をデジタル信号ｓ３１に変換して復調部３２へ出力する。各復調部３２は、デジタル信号ｓ３１を復調し、第１受信部１１ａ～１１ｄの出力信号である第１受信処理信号ｓａ～ｓｄを出力する。第１受信処理信号ｓａ～ｓｄは、例えば、同じチャネル周波数の信号に基づく信号である。また、復調部３２は、復調した後のデジタル信号ｓ３１に基づいて、現在受信している放送信号の受信品質に関する情報をメインコントローラ４へ出力する。 The AD conversion unit 31 converts the analog signal amplified by the second amplification unit 25 into a digital signal s31 and outputs it to the demodulation unit 32. Each demodulation unit 32 demodulates the digital signal s31 and outputs the first reception processing signals sa to sd, which are the output signals of the first reception units 11a to 11d. The first reception processing signals sa to sd are, for example, signals based on signals having the same channel frequency. Further, the demodulation unit 32 outputs information on the reception quality of the currently received broadcast signal to the main controller 4 based on the demodulated digital signal s31.
　第１の合成部３３は、複数の第１受信部１１ａ～１１ｄから出力された複数の第１受信処理信号ｓａ～ｓｄの少なくとも２つを合成して第１合成信号ｓ３３を生成する。第１の合成部３３は、第１合成信号ｓ３３を生成する際に、複数の第１受信処理信号ｓａ～ｓｄを任意に選択して合成する。第１の合成部３３は、第１合成信号ｓ３３を第１の誤り訂正部３５へ出力する。 The first synthesis unit 33 synthesizes at least two of the plurality of first reception processing signals sa to sd output from the plurality of first reception units 11a to 11d to generate the first composite signal s33. When the first composite signal s33 is generated, the first synthesis unit 33 arbitrarily selects and synthesizes a plurality of first reception processing signals sa to sd. The first synthesis unit 33 outputs the first synthesis signal s33 to the first error correction unit 35.
　第１の誤り訂正部３５は、第１合成信号ｓ３３に対して第１の誤り訂正処理を行う。本実施の形態において、第１の誤り訂正部３５は、デジタル放送のチャネル周波数をサーチするチャネルサーチ時（以下、単に「チャネルサーチ時」と呼ぶ場合がある）、および、チャネルサーチをせずにデジタル放送を受信する通常受信時（以下、単に「通常受信時」と呼ぶ場合がある）のそれぞれの時に、第１合成信号ｓ３３に対して第１の誤り訂正処理を行う。そして、第１の誤り訂正部３５は、誤り訂正処理後の信号を映像・音声出力部３ａおよびチャネル情報取得部４０へ出力する。なお、第１の誤り訂正部３５は、復号処理を行ってもよい。 The first error correction unit 35 performs the first error correction process on the first composite signal s33. In the present embodiment, the first error correction unit 35 performs a channel search (hereinafter, may be simply referred to as “channel search”) for searching the channel frequency of digital broadcasting, and without performing the channel search. At each time of normal reception of receiving digital broadcasting (hereinafter, may be simply referred to as "normal reception"), the first error correction processing is performed on the first composite signal s33. Then, the first error correction unit 35 outputs the signal after the error correction processing to the video / audio output unit 3a and the channel information acquisition unit 40. The first error correction unit 35 may perform decoding processing.
　第２の合成部３４は、複数の第１受信部１１ａ～１１ｄから出力された複数の第１受信処理信号ｓａ～ｓｄの少なくとも２つを合成して第２合成信号ｓ３４を生成する。第２の合成部３４は、第２合成信号ｓ３４を生成する際に、複数の第１受信処理信号ｓａ～ｓｄを任意に選択して合成する。第２の合成部３４は、切替部３７を介して、第２合成信号ｓ３４を第２の誤り訂正部３６へ出力する。なお、切替部３７は、チャネルサーチ時および非チャネルサーチ時のいずれかに応じて択一的に切り替えられるスイッチであり、例えばメインコントローラ４によって切替動作を制御される。 The second synthesis unit 34 synthesizes at least two of the plurality of first reception processing signals sa to sd output from the plurality of first reception units 11a to 11d to generate the second composite signal s34. When the second composite signal s34 is generated, the second synthesis unit 34 arbitrarily selects and synthesizes a plurality of first reception processing signals sa to sd. The second synthesis unit 34 outputs the second synthesis signal s34 to the second error correction unit 36 via the switching unit 37. The switching unit 37 is a switch that can be selectively switched according to either a channel search or a non-channel search, and the switching operation is controlled by, for example, the main controller 4.
　第２受信部５０は、チャネルサーチを行うために付加された受信部である。第２受信部５０は、デジタル放送の放送信号の受信品質が所定の受信品質値を下回ったときにチャネルサーチを行い、チャネル情報の取得を開始する。判定基準となる所定の受信品質値は、例えば、所定周波数帯の信号強度およびノイズを考慮した５段階評価により予め設定されている。例えば、メインコントローラ４は、ダイバーシティ受信部１０の復調部３２から取得した受信品質に関する情報に基づいてチャネルサーチを行うべきか否かを判断する。ここで受信品質に関する情報は、第１の合成部３３や第２の合成部３４から取得してもよいし、後段の誤り訂正処理中に算出されるビット誤り率であってもよい。第２受信部５０は、メインコントローラ４の指示に基づいてチャネルサーチを行う。 The second receiving unit 50 is a receiving unit added for performing a channel search. The second receiving unit 50 performs a channel search when the reception quality of the broadcast signal of the digital broadcast falls below a predetermined reception quality value, and starts acquiring channel information. A predetermined reception quality value as a determination standard is set in advance by, for example, a five-step evaluation in consideration of signal strength and noise in a predetermined frequency band. For example, the main controller 4 determines whether or not to perform the channel search based on the information on the reception quality acquired from the demodulation unit 32 of the diversity reception unit 10. Here, the information regarding the reception quality may be acquired from the first synthesis unit 33 or the second synthesis unit 34, or may be a bit error rate calculated during the error correction processing in the subsequent stage. The second receiving unit 50 performs a channel search based on the instruction of the main controller 4.
　第２受信部５０は、アンテナ２ｄおよび第１受信部１１ｄの間の分岐部ｎ１から分岐して入力されたデジタル放送の放送信号を受信処理して第２受信処理信号ｓ２を出力する。 The second receiving unit 50 receives and processes the broadcast signal of the digital broadcast branched and input from the branching unit n1 between the antenna 2d and the first receiving unit 11d, and outputs the second reception processing signal s2.
　第２受信部５０は、チューナ部５１、ＡＤ変換部６１および復調部６２を備えている。チューナ部５１は、第１の増幅部５２、ミキサ部５３、帯域フィルタ５４および第２の増幅部５５によって構成されている。 The second receiving unit 50 includes a tuner unit 51, an AD conversion unit 61, and a demodulation unit 62. The tuner section 51 is composed of a first amplification section 52, a mixer section 53, a band filter 54, and a second amplification section 55.
　第１の増幅部５２は、分岐部ｎ１から入力されたデジタル放送の放送信号を増幅し、増幅して得られた増幅信号ｓ５２をミキサ部５３へ出力する。チューナ部５１は、増幅信号ｓ５２、ならびに、ＰＬＬＡ１２もしくはＰＬＬＢ１３から出力された周波数信号に応じて、ミキサ部５３および帯域フィルタ５４を制御して所定の周波数帯域のアナログ信号を生成する。第２の増幅部５５は、帯域フィルタ５４から出力されたアナログ信号を増幅して、ＡＤ変換部６１へ出力する。 The first amplification unit 52 amplifies the broadcast signal of the digital broadcast input from the branch unit n1, and outputs the amplified signal s52 obtained by amplification to the mixer unit 53. The tuner unit 51 controls the mixer unit 53 and the band filter 54 in accordance with the amplified signal s52 and the frequency signal output from the PLLA 12 or PLLB 13 to generate an analog signal having a predetermined frequency band. The second amplification unit 55 amplifies the analog signal output from the band filter 54 and outputs it to the AD conversion unit 61.
　ＡＤ変換部６１は、第２の増幅部５５で増幅されたアナログ信号をデジタル信号ｓ６１に変換して復調部６２へ出力する。復調部６２は、デジタル信号ｓ６１を復調し、第２受信部５０の出力信号である第２受信処理信号ｓ２を出力する。第２受信部５０は、切替部３７を介して、第２受信処理信号ｓ２を第２の誤り訂正部３６へ出力する。 The AD conversion unit 61 converts the analog signal amplified by the second amplification unit 55 into a digital signal s61 and outputs it to the demodulation unit 62. The demodulation unit 62 demodulates the digital signal s61 and outputs the second reception processing signal s2, which is the output signal of the second reception unit 50. The second reception unit 50 outputs the second reception processing signal s2 to the second error correction unit 36 via the switching unit 37.
　第２の誤り訂正部３６は、第２合成信号ｓ３４および第２受信処理信号ｓ２のそれぞれに対して第２の誤り訂正処理を行う。例えば、第２の誤り訂正部３６は、通常受信時に、切替部３７の作動によって第２の合成部３４に接続され、第２合成信号ｓ３４に対して第２の誤り訂正処理を行い、誤り訂正処理後の信号を映像・音声出力部３ｂへ出力する。また、第２の誤り訂正部３６は、チャネルサーチ時に、切替部３７の作動によって第２受信部５０に接続され、第２受信処理信号ｓ２に対して第２の誤り訂正処理を行い、誤り訂正処理後の信号をチャネル情報取得部４０へ出力する。なお、第２の誤り訂正部３６は、復号処理を行ってもよい。 The second error correction unit 36 performs a second error correction process on each of the second composite signal s34 and the second reception processing signal s2. For example, the second error correction unit 36 is connected to the second synthesis unit 34 by the operation of the switching unit 37 at the time of normal reception, performs the second error correction processing on the second synthesis signal s34, and performs error correction. The processed signal is output to the video / audio output unit 3b. Further, the second error correction unit 36 is connected to the second reception unit 50 by the operation of the switching unit 37 at the time of channel search, performs the second error correction processing on the second reception processing signal s2, and performs error correction. The processed signal is output to the channel information acquisition unit 40. The second error correction unit 36 may perform decoding processing.
　チャネル情報取得部４０は、第１の誤り訂正部３５および第２の誤り訂正部３６から出力された信号に基づいてチャネル情報を取得する。具体的には、チャネル情報取得部４０は、現在位置にて受信可能なデジタル放送のチャネルと周波数との対応関係を示したチャネルテーブルを作成し保存する。メインコントローラ４は、取得したチャネル情報に基づいて、第１受信部１１ａ～１１ｄで受信するチャネルを選局し、第１受信部１１ａ～１１ｄへ選局指示する。また、メインコントローラ４は、第２受信部５０でチャネルサーチを行う際のチャネルを順に変更するように、第２受信部５０へ選局指示する。 The channel information acquisition unit 40 acquires channel information based on the signals output from the first error correction unit 35 and the second error correction unit 36. Specifically, the channel information acquisition unit 40 creates and saves a channel table showing the correspondence between the frequency and the channel of the digital broadcast that can be received at the current position. The main controller 4 selects a channel to be received by the first receiving units 11a to 11d based on the acquired channel information, and instructs the first receiving units 11a to 11d to select the channel. In addition, the main controller 4 instructs the second receiving unit 50 to select channels so that the channels when the second receiving unit 50 performs the channel search are changed in order.
　本実施の形態のデジタル放送受信装置１は、第１受信部１１ａ～１１ｄとは異なる第２受信部５０を備えており、第２受信部５０を用いてチャネルサーチを行う。そのため、チャネルサーチを行うために第１受信部１１ａ～１１ｄを使う必要がなく、第１受信部１１ａ～１１ｄを元々の用途である視聴用の受信部として使うことができる。これにより、デジタル放送の受信特性が劣化することを抑制できる。 The digital broadcast receiving device 1 of the present embodiment includes a second receiving unit 50 different from the first receiving units 11a to 11d, and performs a channel search using the second receiving unit 50. Therefore, it is not necessary to use the first receiving units 11a to 11d to perform the channel search, and the first receiving units 11a to 11d can be used as the receiving unit for viewing, which is the original purpose. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
　なお、上記では、第１受信部が４つ設けられている例を示したが、それに限られず、複数の第１受信部は、２以上または５以上であってもよい。 In the above, an example in which four first receiving units are provided is shown, but the present invention is not limited to this, and the plurality of first receiving units may be two or more or five or more.
　また、上記では、第２受信部５０が１つ設けられている例を示したが、それに限られず、第２受信部５０は、複数設けられていてもよい。その場合、複数の第２受信部５０で受信処理した後の信号を合成し、合成後の信号を第２受信処理信号ｓ２として出力してもよい。 Further, in the above, an example in which one second receiving unit 50 is provided is shown, but the present invention is not limited to this, and a plurality of second receiving units 50 may be provided. In that case, the signals after the reception processing by the plurality of second receiving units 50 may be combined, and the combined signal may be output as the second reception processing signal s2.
　また、上記では、アンテナ２ｄから分岐部ｎ１を介して第１受信部１１ｄおよび第２受信部５０へ電力を分配しているが、分岐後の２つの信号は、等電力であってもよいし、電力差が設けられていてもよい。例えば、チャネルサーチ時に第１受信部１１ｄでの受信品質の低下を抑制するため、第１受信部１１ｄに入力する信号の電力を第２受信部５０に入力する信号の電力よりも大きくしてもよい。 Further, in the above, power is distributed from the antenna 2d to the first receiving unit 11d and the second receiving unit 50 via the branching unit n1, but the two signals after the branching may have equal power. , A power difference may be provided. For example, in order to suppress deterioration of reception quality in the first receiving unit 11d during channel search, the power of the signal input to the first receiving unit 11d may be larger than the power of the signal input to the second receiving unit 50. Good.
　また、上記では、第２受信部５０に接続されるアンテナを１つとしているが、それに限られず、第２受信部５０にアンテナ２ｄと異なる他のアンテナを接続してもよい。その場合、第２受信部５０は、アンテナ２ｄおよび他のアンテナから入力された信号を合成した後、受信処理を行ってもよい。 Further, in the above, the number of antennas connected to the second receiving unit 50 is one, but the present invention is not limited to this, and another antenna different from the antenna 2d may be connected to the second receiving unit 50. In that case, the second receiving unit 50 may perform the receiving process after synthesizing the signals input from the antenna 2d and the other antenna.
　また、ダイバーシティ受信部１０および第２受信部５０は、１つのＬＳＩ（Ｌａｒｇｅ　Ｓｃａｌｅ　Ｉｎｔｅｇｒａｔｉｏｎ）チップで構成されていてもよい。また、ＡＤ変換部３１、復調部３２、第１の合成部３３、第２の合成部３４、第１の誤り訂正部３５および第２の誤り訂正部３６と、ＡＤ変換部６１および復調部６２とが、１つのＬＳＩチップで構成されてもよい。また、チューナ部２１、ＰＬＬＡ１２およびＰＬＬＢ１３と、チューナ部５１とが、１つのＬＳＩチップで構成されてもよい。また、チューナ部２１、ＰＬＬＡ１２およびＰＬＬＢ１３が１つのＬＳＩチップで構成され、チューナ部５１が１つのＬＳＩチップで構成され、上記のＬＳＩチップのうち少なくとも２つがパッケージ化されていてもよい。チャネル情報取得部４０は、上記のＬＳＩチップのいずれかに設けられていてもよい。 Further, the diversity receiving unit 10 and the second receiving unit 50 may be composed of one LSI (Large Scale Integration) chip. Further, the AD conversion unit 31, the demodulation unit 32, the first synthesis unit 33, the second synthesis unit 34, the first error correction unit 35 and the second error correction unit 36, and the AD conversion unit 61 and the demodulation unit 62. And may be composed of one LSI chip. Further, the tuner unit 21, PLLA 12 and PLLB 13, and the tuner unit 51 may be configured by one LSI chip. Further, the tuner unit 21, PLLA 12 and PLLB 13 may be composed of one LSI chip, the tuner unit 51 may be composed of one LSI chip, and at least two of the above LSI chips may be packaged. The channel information acquisition unit 40 may be provided on any of the above LSI chips.
　［１－２．実施の形態１の変形例１］
　実施の形態１の変形例１に係るデジタル放送受信装置１について説明する。変形例１では、第２受信部５０が、複数のアンテナ２ａ～２ｄと異なる他のアンテナ２ｅに接続されている例について説明する。 [1-2. Modification 1 of the first embodiment]
The digital broadcast receiving device 1 according to the first modification of the first embodiment will be described. In the first modification, an example in which the second receiving unit 50 is connected to another antenna 2e different from the plurality of antennas 2a to 2d will be described.
　図３は、実施の形態１の変形例１に係るデジタル放送受信装置１の構成を示す図である。変形例１のデジタル放送受信装置１は、ダイバーシティ受信部１０と、第２受信部５０と、チャネル情報取得部４０と、を備える。 FIG. 3 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 1 of the first embodiment. The digital broadcast receiving device 1 of the modification 1 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
　第２受信部５０は、アンテナ２ｅから入力されたデジタル放送の放送信号を受信処理して第２受信処理信号ｓ２を出力する。その他の構成は、図２に示した実施の形態１と同様である。 The second receiving unit 50 receives and processes the broadcast signal of the digital broadcast input from the antenna 2e and outputs the second reception processing signal s2. Other configurations are the same as those of the first embodiment shown in FIG.
　変形例１の第２受信部５０は、ダイバーシティ受信部１０のアンテナ２ａ～２ｄとは独立したアンテナ２ｅからデジタル放送を入力する。これにより、アンテナ２ａ～２ｄに入力された信号を分岐して他のアンテナに分配する必要がなくなり、デジタル放送の受信特性が劣化することを抑制できる。 The second receiving unit 50 of the first modification inputs digital broadcasting from the antennas 2e independent of the antennas 2a to 2d of the diversity receiving unit 10. As a result, it is not necessary to branch the signals input to the antennas 2a to 2d and distribute them to other antennas, and it is possible to suppress deterioration of the reception characteristics of digital broadcasting.
　ここで、第２受信部５０は、チャネルサーチを行う機能を有していればよいため、ハイビジョンの映像や音声を視聴するためのダイバーシティ受信部よりも、受信機能が低くてもよい。また、アンテナ２ｅは、アンテナ２ａ～２ｄが配置される場所とは異なる場所に設置されてもよい。例えば、アンテナ２ａ～２ｄは、車両のフロントガラスの上部に設置され、アンテナ２ｅは、フロントガラスの下部またはダッシュボード上などに配置されてもよい。 Here, since the second receiving unit 50 only needs to have a function of performing a channel search, the receiving function may be lower than that of the diversity receiving unit for viewing high-definition video and audio. Further, the antenna 2e may be installed in a place different from the place where the antennas 2a to 2d are arranged. For example, the antennas 2a to 2d may be installed on the upper part of the windshield of the vehicle, and the antennas 2e may be arranged on the lower part of the windshield or on the dashboard.
　［１－３．実施の形態１の変形例２］
　実施の形態１の変形例２に係るデジタル放送受信装置１について説明する。変形例２では、ダイバーシティ受信部１０に第２の合成部３４および切替部３７がなく、第２の誤り訂正部３６に第２受信処理信号ｓ２のみが入力される例について説明する。 [1-3. Modification 2 of the first embodiment]
The digital broadcast receiving device 1 according to the second modification of the first embodiment will be described. In the second modification, an example will be described in which the diversity receiving unit 10 does not have the second combining unit 34 and the switching unit 37, and only the second reception processing signal s2 is input to the second error correction unit 36.
　図４は、実施の形態１の変形例２に係るデジタル放送受信装置１の構成を示す図である。変形例２のデジタル放送受信装置１は、ダイバーシティ受信部１０と、第２受信部５０と、チャネル情報取得部４０と、を備える。第２受信部５０およびチャネル情報取得部４０は、実施の形態１と同じである。 FIG. 4 is a diagram showing the configuration of the digital broadcast receiving device 1 according to the second modification of the first embodiment. The digital broadcast receiving device 1 of the second modification includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40. The second receiving unit 50 and the channel information acquisition unit 40 are the same as those in the first embodiment.
　変形例２のダイバーシティ受信部１０は、実施の形態１と異なり、第２の合成部３４、切替部３７および映像・音声出力部３ｂを備えていない。変形例２のダイバーシティ受信部１０は、複数の第１受信部１１ａ～１１ｄ、第１の合成部３３、第１の誤り訂正部３５、第２の誤り訂正部３６を備えている。第１受信部１１ａ～１１ｄ、第１の合成部３３および第１の誤り訂正部３５は、実施の形態１と同様である。 Unlike the first embodiment, the diversity receiving unit 10 of the modification 2 does not include the second combining unit 34, the switching unit 37, and the video / audio output unit 3b. The diversity receiving unit 10 of the second modification includes a plurality of first receiving units 11a to 11d, a first synthesis unit 33, a first error correction unit 35, and a second error correction unit 36. The first receiving units 11a to 11d, the first combining unit 33, and the first error correcting unit 35 are the same as those in the first embodiment.
　第１の誤り訂正部３５は、デジタル放送のチャネル周波数をサーチするチャネルサーチ時およびチャネルサーチをせずにデジタル放送を受信する通常受信時のそれぞれの時に、第１の誤り訂正処理を行い、誤り訂正処理後の信号を映像・音声出力部３ａへ出力する。 The first error correction unit 35 performs the first error correction processing at the time of channel search for searching the channel frequency of digital broadcasting and at the time of normal reception for receiving digital broadcasting without channel search, and performs an error correction process. The corrected signal is output to the video / audio output unit 3a.
　第２の誤り訂正部３６は、第２受信処理信号ｓ２に対して第２の誤り訂正処理を行う。例えば、第２の誤り訂正部３６は、通常受信時に、第２の誤り訂正処理を行わない。第２の誤り訂正部３６は、チャネルサーチ時に、第２受信処理信号ｓ２に対して第２の誤り訂正処理を行い、誤り訂正処理後の信号をチャネル情報取得部４０へ出力する。 The second error correction unit 36 performs the second error correction processing on the second reception processing signal s2. For example, the second error correction unit 36 does not perform the second error correction process at the time of normal reception. The second error correction unit 36 performs the second error correction processing on the second reception processing signal s2 at the time of channel search, and outputs the signal after the error correction processing to the channel information acquisition unit 40.
　チャネル情報取得部４０は、第１の誤り訂正部３５および第２の誤り訂正部３６から出力された信号に基づいてチャネル情報を取得する。メインコントローラ４は、取得したチャネル情報に基づいて、第１受信部１１ａ～１１ｄで受信するチャネルを選局し、第１受信部１１ａ～１１ｄへ選局指示する。また、メインコントローラ４は、第２受信部５０でチャネルサーチを行う際のチャネルを順に変更するように、第２受信部５０へ選局指示する。 The channel information acquisition unit 40 acquires channel information based on the signals output from the first error correction unit 35 and the second error correction unit 36. The main controller 4 selects a channel to be received by the first receiving units 11a to 11d based on the acquired channel information, and instructs the first receiving units 11a to 11d to select the channel. In addition, the main controller 4 instructs the second receiving unit 50 to select channels so that the channels when the second receiving unit 50 performs the channel search are changed in order.
　本変形例のデジタル放送受信装置１でも、第１受信部１１ａ～１１ｄとは異なる第２受信部５０を備えており、第２受信部５０を用いてチャネルサーチを行う。そのため、チャネルサーチを行うために第１受信部１１ａ～１１ｄを使う必要がなく、第１受信部１１ａ～１１ｄを元々の用途である視聴用の受信部として使うことができる。そのため、デジタル放送における受信特性が劣化することを抑制できる。 The digital broadcast receiving device 1 of this modification also has a second receiving unit 50 different from the first receiving units 11a to 11d, and the second receiving unit 50 is used to perform a channel search. Therefore, it is not necessary to use the first receiving units 11a to 11d to perform the channel search, and the first receiving units 11a to 11d can be used as the receiving unit for viewing, which is the original purpose. Therefore, it is possible to suppress deterioration of reception characteristics in digital broadcasting.
　また、本変形例のデジタル放送受信装置１では、第２の誤り訂正部３６をチャネルサーチ専用の誤り訂正部としているので、例えば、データの一部（地上波デジタル放送におけるワンセグ領域など）のみを処理するように構成できる。また、第２受信部５０も信号の一部（ワンセグ領域など）のみを処理するように構成できる。これにより、変形例のデジタル放送受信装置１を、特定の一部の信号のみを処理する構成とすることができ、ロジックやメモリなど回路規模を削減することができる。 Further, in the digital broadcast receiving device 1 of this modification, since the second error correction section 36 is an error correction section dedicated to the channel search, for example, only a part of the data (such as the one-segment area in terrestrial digital broadcasting) is used. Can be configured to process. Further, the second receiving unit 50 can also be configured to process only a part of the signal (one-segment region or the like). As a result, the modified digital broadcast receiving device 1 can be configured to process only a specific part of the signals, and the circuit scale such as logic and memory can be reduced.
　［１－４．実施の形態１の変形例３］
　実施の形態１の変形例３に係るデジタル放送受信装置１について説明する。変形例３では、第２受信部５０から所定の第１受信部に中間信号ｓ５０が出力される例について説明する。 [1-4. Modification 3 of the first embodiment]
The digital broadcast receiving device 1 according to the third modification of the first embodiment will be described. In the third modification, an example in which the intermediate signal s50 is output from the second receiving unit 50 to the predetermined first receiving unit will be described.
　図５は、実施の形態１の変形例３に係るデジタル放送受信装置１の構成を示す図である。変形例３のデジタル放送受信装置１は、ダイバーシティ受信部１０と、第２受信部５０と、チャネル情報取得部４０と、を備えている。 FIG. 5 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 3 of the first embodiment. The digital broadcast receiving device 1 of the third modification includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
　変形例３の第２受信部５０は、チャネルサーチをしていない通常受信時において、複数の第１受信部１１ａ～１１ｄのうちの１つの第１受信部（例えば１１ｄ）および第２受信部５０がデジタル放送の同じチャネル周波数を受信している場合、すなわち第２受信部５０の第１の増幅部５２～第２の増幅部５５の設定を第１受信部１１ｄの第１の増幅部２２～第２の増幅部２５の設定と同じとした場合に、第２受信部５０内にて伝送される中間信号ｓ５０を第１受信部１１ｄへ出力する。中間信号ｓ５０は、第２受信部５０内で処理途中の信号または処理済の信号である。 The second receiving unit 50 of the third modification is the first receiving unit (for example, 11d) and the second receiving unit 50 of one of the plurality of first receiving units 11a to 11d during normal reception without channel search. Is receiving the same channel frequency of digital broadcasting, that is, the setting of the first amplification unit 52 to the second amplification unit 55 of the second reception unit 50 is set to the first amplification unit 22 to the first reception unit 11d. When the setting is the same as that of the second amplification unit 25, the intermediate signal s50 transmitted in the second reception unit 50 is output to the first reception unit 11d. The intermediate signal s50 is a signal in the middle of processing or a signal that has been processed in the second receiving unit 50.
　中間信号ｓ５０が入力される上記１つの第１受信部は、分岐部ｎ１を介して第２受信部５０に接続されている第１受信部１１ｄである。すなわち上記１つの第１受信部は、第２受信部５０とともにアンテナ２ｄを共用している第１受信部１１ｄである。第１受信部１１ｄは、アンテナ２ｄから入力された放送信号および中間信号ｓ５０に基づいて受信処理を行う。 The first receiving unit into which the intermediate signal s50 is input is the first receiving unit 11d connected to the second receiving unit 50 via the branching unit n1. That is, the one first receiving unit is the first receiving unit 11d that shares the antenna 2d with the second receiving unit 50. The first receiving unit 11d performs reception processing based on the broadcast signal and the intermediate signal s50 input from the antenna 2d.
　このように変形例３では、第２受信部５０が複数の第１受信部１１ａ～１１ｄと同一チャネルを受信している場合に、第２受信部５０の中間信号ｓ５０を複数の第１受信部１１ａ～１１ｄのうちの１つの第１受信部１１ｄに戻して合成させる。これによれば、デジタル放送受信装置１がチャネルサーチをせずに通常受信している場合に、第２受信部５０の出力（パワー）を第１受信部１１ｄの受信処理に使うことができる。これにより、分岐部ｎ１による信号の分岐を起因とする特性劣化を軽減することができる。 As described above, in the modification 3, when the second receiving unit 50 receives the same channel as the plurality of first receiving units 11a to 11d, the intermediate signal s50 of the second receiving unit 50 is transmitted to the plurality of first receiving units. It is returned to the first receiving unit 11d of one of 11a to 11d and synthesized. According to this, when the digital broadcast receiving device 1 normally receives without performing a channel search, the output (power) of the second receiving unit 50 can be used for the receiving process of the first receiving unit 11d. As a result, it is possible to reduce the deterioration of characteristics caused by the branching of the signal by the branching portion n1.
　なお、第２受信部５０が第１受信部１１ｄと同一チャネルを受信している場合において、中間信号ｓ５０を第１受信部１１ｄに出力する際に、中間信号ｓ５０に係数α（０から１までなめらかに単調増加させた係数）を乗算して出力してもよい。例えば、中間信号ｓ５０を合成するときに、第１受信部１１ｄにて一時的に信号電力の増加が発生し、ＡＧＣ（Ａｕｔｏｍａｔｉｃ　Ｇａｉｎ　Ｃｏｎｔｒｏｌ）や復調処理の連続性に影響を与えてしまうことがある。それに対し、上記のように中間信号ｓ５０に係数αを乗算して出力することで、合成時の信号電力を徐々に増加させ、ＡＧＣや復調処理への影響を緩和することができる。一方、中間信号ｓ５０の合成を停止する場合は、中間信号ｓ５０に乗算する係数αを１から０までなめらかに単調減少させた係数にしてもよい。これにより、合成時の信号電力を徐々に減少させ、ＡＧＣや復調処理への影響を緩和することができる。 When the second receiving unit 50 is receiving the same channel as the first receiving unit 11d, when the intermediate signal s50 is output to the first receiving unit 11d, the intermediate signal s50 has a coefficient α (from 0 to 1). It may be output by multiplying by a smooth and monotonically increased coefficient). For example, when synthesizing the intermediate signal s50, the signal power may be temporarily increased in the first receiving unit 11d, which may affect the continuity of AGC (Automatic Gain Control) and demodulation processing. .. On the other hand, by multiplying the intermediate signal s50 by the coefficient α and outputting as described above, the signal power at the time of synthesis can be gradually increased, and the influence on AGC and demodulation processing can be mitigated. On the other hand, when the synthesis of the intermediate signal s50 is stopped, the coefficient α to be multiplied by the intermediate signal s50 may be a coefficient obtained by smoothly and monotonically decreasing from 1 to 0. As a result, the signal power at the time of synthesis can be gradually reduced, and the influence on AGC and demodulation processing can be mitigated.
　［１－５．実施の形態１の変形例４］
　実施の形態１の変形例４に係るデジタル放送受信装置１について説明する。変形例４では、第２受信部５０の第１の増幅部５２の出力が第１受信部の第１の増幅部２２の出力に加算される例について説明する。 [1-5. Modification 4 of the first embodiment]
The digital broadcast receiving device 1 according to the fourth modification of the first embodiment will be described. In the fourth modification, an example in which the output of the first amplification unit 52 of the second reception unit 50 is added to the output of the first amplification unit 22 of the first reception unit will be described.
　図６は、実施の形態１の変形例４に係るデジタル放送受信装置１の構成を示す図である。変形例４のデジタル放送受信装置１は、ダイバーシティ受信部１０と、第２受信部５０と、チャネル情報取得部４０と、を備えている。 FIG. 6 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 4 of the first embodiment. The digital broadcast receiving device 1 of the modification 4 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
　変形例４の第２受信部５０は、通常受信時において、複数の第１受信部１１ａ～１１ｄのうちの１つの第１受信部（例えば１１ｄ）および第２受信部５０がデジタル放送の同じチャネル周波数を受信している場合に、第１の増幅部５２から出力された増幅信号ｓ５２を、第１受信部１１ｄへ出力する。具体的には、増幅信号ｓ５２が、第１の増幅部２２とミキサ部２３との間に設けられた加算器に加算される。第１受信部１１ｄは、第１の増幅部２２から出力された増幅信号ｓ２２および第２受信部５０の第１の増幅部５２から出力された増幅信号ｓ５２に基づいて受信処理を行う。 In the second receiving unit 50 of the modified example 4, one of the plurality of first receiving units 11a to 11d (for example, 11d) and the second receiving unit 50 are in the same channel of digital broadcasting at the time of normal reception. When the frequency is being received, the amplification signal s52 output from the first amplification unit 52 is output to the first reception unit 11d. Specifically, the amplification signal s52 is added to an adder provided between the first amplification unit 22 and the mixer unit 23. The first receiving unit 11d performs reception processing based on the amplification signal s22 output from the first amplification unit 22 and the amplification signal s52 output from the first amplification unit 52 of the second reception unit 50.
　このように変形例４では、第２受信部５０が第１受信部１１ｄと同一チャネルを受信している場合に、第２受信部５０の第１の増幅部５２の増幅信号ｓ５２を、第１受信部１１ｄの第１の増幅部２２の増幅信号ｓ２２に出力し合成させる。これによれば、デジタル放送受信装置１がチャネルサーチをせずに通常受信している場合に、第１の増幅部５２の出力（パワー）を第１受信部１１ｄの受信処理に使うことができる。これにより、分岐部ｎ１による信号の分岐を起因とする特性劣化を軽減することができる。 As described above, in the modified example 4, when the second receiving unit 50 receives the same channel as the first receiving unit 11d, the amplification signal s52 of the first amplification unit 52 of the second receiving unit 50 is first. It is output to the amplification signal s22 of the first amplification unit 22 of the reception unit 11d and synthesized. According to this, when the digital broadcast receiving device 1 normally receives without performing a channel search, the output (power) of the first amplification unit 52 can be used for the reception processing of the first receiving unit 11d. .. As a result, it is possible to reduce the deterioration of characteristics caused by the branching of the signal by the branching portion n1.
　なお、上記では、加算器が第１の増幅部２２の後段に配置されている例を示したが、それに限られず、加算器は、チューナ部２１の内部であれば、ミキサ部２３の後段または帯域フィルタ２４の後段などに配置されてもよい。 In the above, an example in which the adder is arranged after the first amplification unit 22 is shown, but the adder is not limited to that, and if the adder is inside the tuner unit 21, it is located after the mixer unit 23 or. It may be arranged in the subsequent stage of the band filter 24 or the like.
　［１－６．実施の形態１の変形例５］
　実施の形態１の変形例５に係るデジタル放送受信装置１について説明する。変形例５では、第２受信部５０のＡＤ変換部６１の出力が第１受信部のＡＤ変換部３１の出力に加算される例について説明する。 [1-6. Modification 5 of the first embodiment]
The digital broadcast receiving device 1 according to the fifth modification of the first embodiment will be described. In the fifth modification, an example in which the output of the AD conversion unit 61 of the second receiving unit 50 is added to the output of the AD conversion unit 31 of the first receiving unit will be described.
　図７は、実施の形態１の変形例５に係るデジタル放送受信装置１の構成を示す図である。変形例５のデジタル放送受信装置１は、ダイバーシティ受信部１０と、第２受信部５０と、チャネル情報取得部４０と、を備えている。 FIG. 7 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 5 of the first embodiment. The digital broadcast receiving device 1 of the modification 5 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
　変形例５の第２受信部５０は、通常受信時において、複数の第１受信部１１ａ～１１ｄのうちの１つの第１受信部（例えば１１ｄ）および第２受信部５０がデジタル放送の同じチャネル周波数を受信している場合に、第２受信部５０のＡＤ変換部６１から出力されたデジタル信号ｓ６１を、第１受信部１１ｄへ出力する。具体的には、デジタル信号ｓ６１が、ＡＤ変換部３１と復調部３２との間に設けられた加算器に加算される。第１受信部１１ｄは、ＡＤ変換部３１から出力されたデジタル信号ｓ３１および第２受信部５０のＡＤ変換部６１から出力されたデジタル信号ｓ６１に基づいて受信処理を行う。 In the second receiving unit 50 of the modification 5, one of the plurality of first receiving units 11a to 11d (for example, 11d) and the second receiving unit 50 are in the same channel of digital broadcasting at the time of normal reception. When the frequency is being received, the digital signal s61 output from the AD conversion unit 61 of the second receiving unit 50 is output to the first receiving unit 11d. Specifically, the digital signal s61 is added to an adder provided between the AD conversion unit 31 and the demodulation unit 32. The first receiving unit 11d performs reception processing based on the digital signal s31 output from the AD conversion unit 31 and the digital signal s61 output from the AD conversion unit 61 of the second receiving unit 50.
　このように変形例５では、第２受信部５０が第１受信部１１ｄと同一チャネルを受信している場合に、第２受信部５０のＡＤ変換部６１のデジタル信号ｓ６１を、第１受信部１１ｄのＡＤ変換部３１のデジタル信号ｓ３１に出力し合成させる。これによれば、デジタル放送受信装置１がチャネルサーチをせずに通常受信している場合に、ＡＤ変換部６１の出力（パワー）を第１受信部１１ｄの受信処理に使うことができる。これにより、分岐部ｎ１による信号の分岐を起因とする特性劣化を軽減することができる。 As described above, in the modified example 5, when the second receiving unit 50 receives the same channel as the first receiving unit 11d, the digital signal s61 of the AD conversion unit 61 of the second receiving unit 50 is transmitted to the first receiving unit. It is output to the digital signal s31 of the AD conversion unit 31 of 11d and synthesized. According to this, when the digital broadcast receiving device 1 normally receives without performing a channel search, the output (power) of the AD conversion unit 61 can be used for the reception processing of the first receiving unit 11d. As a result, it is possible to reduce the deterioration of characteristics caused by the branching of the signal by the branching portion n1.
　なお、上記では、ＡＤ変換部６１の出力がＡＤ変換部３１の出力に加算されている例を示したが、それに限られず、復調部３２の出力が復調部３２の出力に加算されてもよい。また、復調部３２での加算は、周波数変換の後やレート変換した後や、ＦＦＴ変換前やＦＦＴ変換後に行われてもよい。 In the above, an example in which the output of the AD conversion unit 61 is added to the output of the AD conversion unit 31 is shown, but the present invention is not limited to this, and the output of the demodulation unit 32 may be added to the output of the demodulation unit 32. .. Further, the addition in the demodulation unit 32 may be performed after frequency conversion, rate conversion, before FFT conversion, or after FFT conversion.
　［１－７．実施の形態１の変形例６］
　実施の形態１の変形例６に係るデジタル放送受信装置１について説明する。変形例６では、第２受信部５０の第２受信処理信号ｓ２が第１の合成部３３および第２の合成部３４の両方へ出力されている例について説明する。 [1-7. Modification 6 of the first embodiment]
The digital broadcast receiving device 1 according to the sixth modification of the first embodiment will be described. In the sixth modification, an example in which the second reception processing signal s2 of the second reception unit 50 is output to both the first synthesis unit 33 and the second synthesis unit 34 will be described.
　図８は、実施の形態１の変形例６に係るデジタル放送受信装置１の構成を示す図である。変形例６のデジタル放送受信装置１は、ダイバーシティ受信部１０と、第２受信部５０と、チャネル情報取得部４０と、を備えている。 FIG. 8 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 6 of the first embodiment. The digital broadcast receiving device 1 of the modification 6 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
　変形例６の第２受信部５０は、第２受信処理信号ｓ２を第１の合成部３３および第２の合成部３４へ出力する。なお、第２受信処理信号ｓ２は、第２の誤り訂正部３６にも出力されている。 The second receiving unit 50 of the modification 6 outputs the second reception processing signal s2 to the first combining unit 33 and the second combining unit 34. The second reception processing signal s2 is also output to the second error correction unit 36.
　通常受信時において、複数の第１受信部１１ａ～１１ｄおよび第２受信部５０がデジタル放送の同じチャネル周波数を受信している場合に、第１の合成部３３は、複数の第１受信処理信号ｓａ～ｓｄおよび第２受信処理信号ｓ２に基づいて第１合成信号ｓ３３を生成する。第２の合成部３４は、複数の第１受信処理信号ｓａ～ｓｄおよび第２受信処理信号ｓ２に基づいて第２合成信号ｓ３４を生成する。 At the time of normal reception, when the plurality of first receiving units 11a to 11d and the second receiving unit 50 are receiving the same channel frequency of digital broadcasting, the first synthesis unit 33 is the plurality of first reception processing signals. The first composite signal s33 is generated based on the sa to sd and the second reception processing signal s2. The second synthesis unit 34 generates the second synthesis signal s34 based on the plurality of first reception processing signals sa to sd and the second reception processing signal s2.
　このように変形例６では、第２受信部５０が第１受信部１１ｄと同一チャネルを受信している場合に、第２受信部５０の第２受信処理信号ｓ２を第１の合成部３３および第２の合成部３４へ出力する。これによれば、デジタル放送受信装置１がチャネルサーチをせずに通常受信している場合に、第２受信処理信号ｓ２を用いて第１合成信号ｓ３３および第２合成信号ｓ３４を生成することができる。これにより、分岐部ｎ１による信号の分岐を起因とする特性劣化を軽減することができる。 As described above, in the modification 6, when the second receiving unit 50 receives the same channel as the first receiving unit 11d, the second receiving processing signal s2 of the second receiving unit 50 is transmitted to the first combining unit 33 and the first combining unit 33. Output to the second synthesis unit 34. According to this, when the digital broadcast receiving device 1 normally receives without performing a channel search, the first combined signal s33 and the second combined signal s34 can be generated by using the second reception processing signal s2. it can. As a result, it is possible to reduce the deterioration of characteristics caused by the branching of the signal by the branching portion n1.
　［１－８．実施の形態１の変形例７］
　実施の形態１の変形例７に係るデジタル放送受信装置１について説明する。変形例７では、分岐部ｎ１がダイバーシティ受信部１０内に設けられている例について説明する。 [1-8. Modification 7 of the first embodiment]
The digital broadcast receiving device 1 according to the modified example 7 of the first embodiment will be described. In the modified example 7, an example in which the branch portion n1 is provided in the diversity receiving unit 10 will be described.
　図９は、実施の形態１の変形例７に係るデジタル放送受信装置１の構成を示す図である。変形例７のデジタル放送受信装置１は、ダイバーシティ受信部１０と、第２受信部５０と、チャネル情報取得部４０と、を備えている。 FIG. 9 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 7 of the first embodiment. The digital broadcast receiving device 1 of the modification 7 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
　変形例７では、分岐部ｎ１がダイバーシティ受信部１０内に設けられている。これにより、ダイバーシティ受信部１０をＬＳＩチップＣＰ１で構成した場合に、分岐部ｎ１をＬＳＩチップＣＰ１内に設けることができ、ＬＳＩチップが搭載されているプリント基板上における部品点数を削減することができる。 In the modification 7, the branch portion n1 is provided in the diversity receiving unit 10. As a result, when the diversity receiving unit 10 is configured by the LSI chip CP1, the branching unit n1 can be provided in the LSI chip CP1, and the number of parts on the printed circuit board on which the LSI chip is mounted can be reduced. ..
　なお、ダイバーシティ受信部１０および第２受信部５０は、１つのＬＳＩチップで構成され、分岐部ｎ１がそのＬＳＩチップの内部に設けられていてもよい。また、チューナ部２１、ＰＬＬＡ１２およびＰＬＬＢ１３と、チューナ部５１とが、１つのＬＳＩチップで構成され、分岐部ｎ１がそのＬＳＩチップの内部に設けられていてもよい。また、チューナ部２１、ＰＬＬＡ１２およびＰＬＬＢ１３が１つのＬＳＩチップで構成され、分岐部ｎ１がそのＬＳＩチップの内部に設けられていてもよい。 The diversity receiving unit 10 and the second receiving unit 50 may be composed of one LSI chip, and the branching unit n1 may be provided inside the LSI chip. Further, the tuner unit 21, PLLA 12 and PLLB 13, and the tuner unit 51 may be configured by one LSI chip, and the branch unit n1 may be provided inside the LSI chip. Further, the tuner unit 21, PLLA 12 and PLLB 13 may be composed of one LSI chip, and the branch unit n1 may be provided inside the LSI chip.
　［１－９．実施の形態１の変形例８］
　実施の形態１の変形例８に係るデジタル放送受信装置１について説明する。変形例８では、第２受信部５０が、ＶＨＦ－Ｌｏｗ帯受信用またはＶＨＦ－Ｈｉｇｈ帯受信用のアンテナ２ｈから入力されたＶＬ信号またはＶＨ信号を受信処理する例について説明する。 [1-9. Modification 8 of the first embodiment]
The digital broadcast receiving device 1 according to the modified example 8 of the first embodiment will be described. In the eighth modification, an example in which the second receiving unit 50 receives and processes a VL signal or a VH signal input from the antenna 2h for VHF-Low band reception or VHF-High band reception will be described.
　図１０は、実施の形態１の変形例８に係るデジタル放送受信装置１の構成を示す図である。変形例８のデジタル放送受信装置１は、ダイバーシティ受信部１０と、第２受信部５０と、チャネル情報取得部４０と、を備えている。 FIG. 10 is a diagram showing a configuration of a digital broadcast receiving device 1 according to a modification 8 of the first embodiment. The digital broadcast receiving device 1 of the modification 8 includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
　第２受信部５０は、チャネルサーチを行うため、ならびに、ＶＨＦ－Ｌｏｗ帯のＶＬ信号およびＶＨＦ－Ｈｉｇｈ帯のＶＨ信号を受信するために付加された受信部である。第２受信部５０は、分岐部ｎ１から分岐して入力されたデジタル放送の放送信号を受信処理して、あるいは、ＶＨＦ－Ｌｏｗ帯受信用またはＶＨＦ－Ｈｉｇｈ帯受信用のアンテナ２ｈから入力されたＶＬ信号またはＶＨ信号を受信処理して第２受信処理信号ｓ２を出力する。 The second receiving unit 50 is a receiving unit added for performing a channel search and for receiving a VL signal in the VHF-Low band and a VH signal in the VHF-High band. The second receiving unit 50 receives and processes the broadcast signal of the digital broadcast branched and input from the branching unit n1, or is input from the antenna 2h for VHF-Low band reception or VHF-High band reception. The VL signal or VH signal is received and processed, and the second reception processing signal s2 is output.
　第２受信部５０は、チューナ部５１、ＡＤ変換部６１および復調部６２を備えている。また、第２受信部５０は、第３の増幅部７１および切替部７２を備えている。チューナ部５１は、第１の増幅部５２、ミキサ部５３、帯域フィルタ５４および第２の増幅部５５によって構成されている。 The second receiving unit 50 includes a tuner unit 51, an AD conversion unit 61, and a demodulation unit 62. Further, the second receiving unit 50 includes a third amplifying unit 71 and a switching unit 72. The tuner section 51 is composed of a first amplification section 52, a mixer section 53, a band filter 54, and a second amplification section 55.
　第１の増幅部５２は、分岐部ｎ１から入力されたデジタル放送の放送信号を増幅し、増幅して得られた増幅信号ｓ５２を、切替部７２を介してミキサ部５３へ出力する。第３の増幅部７１は、入力されたＶＬ信号またはＶＨ信号を増幅し、増幅して得られた増幅信号を、切替部７２を介してミキサ部５３へ出力する。切替部７２は、択一的に切り替えられるスイッチであり、例えばメインコントローラ４によって作動を制御される。 The first amplification unit 52 amplifies the broadcast signal of the digital broadcast input from the branch unit n1, and outputs the amplified signal s52 obtained by amplifying the amplification signal s52 to the mixer unit 53 via the switching unit 72. The third amplification unit 71 amplifies the input VL signal or VH signal, and outputs the amplified signal obtained by amplification to the mixer unit 53 via the switching unit 72. The switching unit 72 is a switch that can be selectively switched, and its operation is controlled by, for example, the main controller 4.
　例えば、チャネルサーチを行わずにＶＬ信号またはＶＨ信号を受信する場合、切替部７２の作動により、第３の増幅部７１で増幅された信号がミキサ部５３に入力される。一方、チャネルサーチを行う場合、切替部７２の作動により、第１の増幅部５２で増幅された信号がミキサ部５３に入力される。この構成により、ミキサ部、帯域フィルタ、第２の増幅部、ＡＤ変換部および復調部を複数設けることなく、少ない回路規模で、チャネルサーチを行い、また、ＶＬ信号およびＶＨ信号の受信を行うことができる。 For example, when a VL signal or a VH signal is received without performing a channel search, the signal amplified by the third amplification unit 71 is input to the mixer unit 53 by the operation of the switching unit 72. On the other hand, when performing a channel search, the signal amplified by the first amplification unit 52 is input to the mixer unit 53 by the operation of the switching unit 72. With this configuration, channel search can be performed on a small circuit scale and VL signals and VH signals can be received without providing a plurality of mixer units, band filters, second amplification units, AD conversion units, and demodulation units. Can be done.
　なお、第２受信部５０の切替入力の選択肢として、「地上波デジタル専用モード」、「ＶＬ／ＶＨ専用モード」および「ＶＬ／ＶＨ優先モード」の３モードが設けられていてもよい。この場合、「地上波デジタル専用モード」が設定されると、切替部７２はアンテナ２ｄ側の第１の増幅部５２に接続され、「ＶＬ／ＶＨ専用モード」が設定されると、切替部７２はアンテナ２ｈ側の第３の増幅部７１に接続される。また、「ＶＬ／ＶＨ優先モード」が設定された状態で、ダイバーシティ受信部１０の信号品質が所定の値以上でチャネルサーチが不要なときは、アンテナ２ｈ側の第３の増幅部７１に接続され、ダイバーシティ受信部１０の信号品質が所定の値より低くチャネルサーチが必要とされる場合は、アンテナ２ｄ側の第１の増幅部５２に接続される。 Note that, as options for switching input of the second receiver 50, three modes of "terrestrial digital dedicated mode", "VL / VH dedicated mode", and "VL / VH priority mode" may be provided. In this case, when the "terrestrial digital dedicated mode" is set, the switching unit 72 is connected to the first amplification unit 52 on the antenna 2d side, and when the "VL / VH dedicated mode" is set, the switching unit 72. Is connected to the third amplification unit 71 on the antenna 2h side. When the signal quality of the diversity receiving unit 10 is equal to or higher than a predetermined value and channel search is unnecessary in the state where the "VL / VH priority mode" is set, the signal quality is connected to the third amplification unit 71 on the antenna 2h side. When the signal quality of the diversity receiving unit 10 is lower than a predetermined value and channel search is required, the signal quality is connected to the first amplification unit 52 on the antenna 2d side.
　［１－１０．効果等］
　本実施の形態のデジタル放送受信装置１は、複数のアンテナ２ａ～２ｄから入力されたデジタル放送の放送信号を受信処理して複数の第１受信処理信号ｓａ～ｓｄを出力する複数の第１受信部１１ａ～１１ｄと、複数の第１受信処理信号ｓａ～ｓｄの少なくとも２つを合成して第１合成信号ｓ３３を出力する第１の合成部３３と、第１合成信号ｓ３３に対して第１の誤り訂正処理を行う第１の誤り訂正部３５と、入力された信号を受信処理して第２受信処理信号ｓ２を出力する第２受信部５０と、第２受信処理信号ｓ２に対してまたは第２受信処理信号ｓ２に基づいて処理された処理信号に対して第２の誤り訂正処理を行う第２の誤り訂正部３６と、を備える。 [1-10. Effect, etc.]
The digital broadcast receiving device 1 of the present embodiment receives and processes digital broadcast broadcast signals input from a plurality of antennas 2a to 2d and outputs a plurality of first reception processed signals sa to sd. Units 11a to 11d, the first synthesis unit 33 that synthesizes at least two of the plurality of first reception processing signals sa to sd and outputs the first synthesis signal s33, and the first synthesis signal s33. With respect to the first error correction unit 35 that performs the error correction processing of the above, the second reception unit 50 that receives and processes the input signal and outputs the second reception processing signal s2, and the second reception processing signal s2. A second error correction unit 36 that performs a second error correction process on the processed signal processed based on the second reception processing signal s2 is provided.
　このように、デジタル放送受信装置１が、第１受信部１１ａ～１１ｄとは異なる第２受信部５０を備えることで、第２受信部５０を用いてチャネルサーチを行うことが可能となる。そのため、チャネルサーチを行う際に第１受信部１１ａ～１１ｄを使う必要がなく、第１受信部１１ａ～１１ｄを元々の用途である視聴用の受信部として使うことができる。これにより、チャネルサーチを行う際に、デジタル放送の受信特性が劣化することを抑制できる。 As described above, since the digital broadcast receiving device 1 includes the second receiving unit 50 different from the first receiving units 11a to 11d, the channel search can be performed using the second receiving unit 50. Therefore, it is not necessary to use the first receiving units 11a to 11d when performing the channel search, and the first receiving units 11a to 11d can be used as the receiving unit for viewing, which is the original purpose. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
　また、第２受信部５０は、放送信号を上記入力された信号とし、上記入力された信号に対しチャネルサーチを行い、第２受信処理信号ｓ２を出力してもよい。 Further, the second receiving unit 50 may use the broadcast signal as the input signal, perform a channel search on the input signal, and output the second reception processing signal s2.
　このように、第２受信部５０が、チャネルサーチによって第２受信処理信号ｓ２を出力することで、チャネルサーチを行う際に第１受信部１１ａ～１１ｄを使う必要がなく、第１受信部１１ａ～１１ｄを元々の用途である視聴用の受信部として使うことができる。これにより、チャネルサーチを行う際に、デジタル放送の受信特性が劣化することを抑制できる。 In this way, the second receiving unit 50 outputs the second reception processing signal s2 by the channel search, so that it is not necessary to use the first receiving units 11a to 11d when performing the channel search, and the first receiving unit 11a ~ 11d can be used as a receiving unit for viewing, which is the original purpose. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
　また、デジタル放送受信装置１は、さらに、第２の誤り訂正部３６から出力された信号に基づいてデジタル放送のチャネル情報を取得するチャネル情報取得部４０を備えていてもよい。 Further, the digital broadcast receiving device 1 may further include a channel information acquisition unit 40 that acquires channel information of digital broadcasting based on the signal output from the second error correction unit 36.
　このように、デジタル放送受信装置１がチャネル情報取得部４０を備えることで、チャネルサーチを行う際に、チャネル情報を適切に取得することができる。チャネル情報を適切に取得することで、例えば、所定の中継局６ａのチャネルの受信品質が低下した場合に、受信するチャネルを、受信品質の高い中継局６ｂのチャネルに切り替えることができる。これにより、デジタル放送の受信特性が劣化することを抑制しながら受信するチャネルを速やかに受信品質が安定した他の中継局のチャネルに切り替えることができる。 In this way, by providing the digital broadcast receiving device 1 with the channel information acquisition unit 40, it is possible to appropriately acquire the channel information when performing the channel search. By appropriately acquiring the channel information, for example, when the reception quality of the channel of the predetermined relay station 6a deteriorates, the receiving channel can be switched to the channel of the relay station 6b having high reception quality. As a result, the channel to be received can be quickly switched to the channel of another relay station having stable reception quality while suppressing deterioration of the reception characteristics of digital broadcasting.
　また、第２受信部５０は、複数のアンテナ２ａ～２ｄのうちの少なくとも１つのアンテナから入力された放送信号を上記入力された信号とし、受信処理してもよい。 Further, the second receiving unit 50 may use the broadcast signal input from at least one of the plurality of antennas 2a to 2d as the input signal and perform reception processing.
　これによれば、アンテナの数を増やすことなく、第２受信部５０を用いてチャネルサーチを行うことができる。 According to this, the channel search can be performed using the second receiving unit 50 without increasing the number of antennas.
　また、第２受信部５０は、複数のアンテナ２ａ～２ｄとは異なる他のアンテナ２ｅから入力された放送信号を上記入力された信号とし、受信処理してもよい。 Further, the second receiving unit 50 may use the broadcast signal input from another antenna 2e different from the plurality of antennas 2a to 2d as the input signal and perform reception processing.
　これによれば、独立したアンテナ２ｅを用いてチャネルサーチを行うことができる。これにより、チャネルサーチを行う際に、デジタル放送の受信特性が劣化することを抑制できる。 According to this, the channel search can be performed using the independent antenna 2e. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
　また、第１の誤り訂正部３５は、デジタル放送のチャネル周波数をサーチするチャネルサーチ時およびチャネルサーチをせずにデジタル放送を受信する通常受信時のそれぞれの時に、第１の誤り訂正処理を行い、第２の誤り訂正部３６は、チャネルサーチ時に第２の誤り訂正処理を行い、通常受信時に第２の誤り訂正処理を行わなくてもよい。 In addition, the first error correction unit 35 performs the first error correction processing at the time of channel search for searching the channel frequency of digital broadcasting and at the time of normal reception for receiving digital broadcasting without channel search. , The second error correction unit 36 may perform the second error correction processing at the time of channel search, and may not perform the second error correction processing at the time of normal reception.
　このように、第２の誤り訂正部３６をチャネルサーチ時に作動させ、通常受信時に作動させないことで、第２の誤り訂正部３６の作動にかかる負担を低減することができる。これにより、通常受信時において、デジタル放送の受信特性が劣化することを抑制できる。 In this way, by operating the second error correction unit 36 at the time of channel search and not operating at the time of normal reception, the burden on the operation of the second error correction unit 36 can be reduced. As a result, it is possible to prevent deterioration of the reception characteristics of digital broadcasting during normal reception.
　また、デジタル放送受信装置１は、さらに、複数の第１受信部１１ａ～１１ｄから出力された複数の第１受信処理信号ｓａ～ｓｄの少なくとも２つを合成して第２合成信号ｓ３４を出力する第２の合成部３４を備え、第２の合成部３４は、第２合成信号ｓ３４を第２の誤り訂正部３６へ出力し、第２の誤り訂正部３６は、第２受信処理信号ｓ２および第２合成信号ｓ３４のそれぞれに対して第２の誤り訂正処理を行ってもよい。 Further, the digital broadcast receiving device 1 further synthesizes at least two of the plurality of first reception processing signals sa to sd output from the plurality of first receiving units 11a to 11d and outputs the second combined signal s34. The second synthesis unit 34 includes the second synthesis unit 34, the second synthesis unit 34 outputs the second synthesis signal s34 to the second error correction unit 36, and the second error correction unit 36 receives the second reception processing signal s2 and A second error correction process may be performed on each of the second composite signals s34.
　このように、第２の誤り訂正部３６が、第２受信処理信号ｓ２および第２合成信号ｓ３４のそれぞれに対して誤り訂正処理を行うことで、通常視聴のための出力およびチャネルサーチ結果の出力のそれぞれを適正に行うことができる。これにより、チャネルサーチをする際に、デジタル放送の受信特性が劣化することを抑制できる。 In this way, the second error correction unit 36 performs error correction processing on each of the second reception processing signal s2 and the second composite signal s34, so that the output for normal viewing and the output of the channel search result are output. Each of these can be done properly. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
　また、第１の誤り訂正部３５は、デジタル放送のチャネル周波数をサーチするチャネルサーチ時およびチャネルサーチをせずにデジタル放送を受信する通常受信時のそれぞれの時に、第１合成信号ｓ３３に対して第１の誤り訂正処理を行い、第２の誤り訂正部３６は、チャネルサーチ時に第２受信処理信号ｓ２に対して第２の誤り訂正処理を行い、通常受信時に第２合成信号ｓ３４に対して第２の誤り訂正処理を行ってもよい。 Further, the first error correction unit 35 refers to the first composite signal s33 at the time of channel search for searching the channel frequency of digital broadcasting and at the time of normal reception for receiving digital broadcasting without channel search. The first error correction processing is performed, the second error correction unit 36 performs the second error correction processing on the second reception processing signal s2 at the time of channel search, and performs the second error correction processing on the second composite signal s34 at the time of normal reception. A second error correction process may be performed.
　このように、第２の誤り訂正部３６が、チャネルサーチ時に第２受信処理信号ｓ２に対して誤り訂正処理を行い、通常受信時に第２合成信号ｓ３４に対して誤り訂正処理を行うことで、チャネルサーチ時および通常受信時のそれぞれにおいて、誤り訂正処理による適正な出力を行うことができる。これにより、チャネルサーチをする際に、デジタル放送の受信特性が劣化することを抑制できる。 In this way, the second error correction unit 36 performs error correction processing on the second reception processing signal s2 at the time of channel search, and performs error correction processing on the second composite signal s34 at the time of normal reception. Appropriate output can be performed by error correction processing at the time of channel search and at the time of normal reception. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
　また、第２受信部５０は、さらに、第２受信処理信号ｓ２を第１の合成部３３および第２の合成部３４へ出力し、通常受信時において、複数の第１受信部１１ａ～１１ｄおよび第２受信部５０がデジタル放送の同じチャネル周波数を受信している場合に、第１の合成部３３は、複数の第１受信処理信号ｓａ～ｓｄおよび第２受信処理信号ｓ２に基づいて第１合成信号ｓ３３を生成し、第２の合成部３４は、複数の第１受信処理信号ｓａ～ｓｄおよび第２受信処理信号ｓ２に基づいて第２合成信号ｓ３４を生成してもよい。 Further, the second receiving unit 50 further outputs the second reception processing signal s2 to the first combining unit 33 and the second combining unit 34, and at the time of normal reception, the plurality of first receiving units 11a to 11d and When the second receiving unit 50 receives the same channel frequency of the digital broadcast, the first combining unit 33 is the first based on the plurality of first receiving processing signals sa to sd and the second receiving processing signal s2. The composite signal s33 may be generated, and the second synthesis unit 34 may generate the second composite signal s34 based on the plurality of first reception processing signals sa to sd and the second reception processing signal s2.
　これによれば、第１受信処理信号ｓａ～ｓｄおよび第２受信処理信号ｓ２の両方の信号を用いて、第１合成信号ｓ３３および第２合成信号ｓ３４のそれぞれを生成することができる。これにより、デジタル放送の受信特性が劣化することを抑制できる。 According to this, it is possible to generate each of the first composite signal s33 and the second composite signal s34 by using both the first reception processing signals sa to sd and the second reception processing signal s2. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
　また、第２受信部５０は、通常受信時において、複数の第１受信部１１ａ～１１ｄのうちの１つの第１受信部（例えば１１ｄ）および第２受信部５０がデジタル放送の同じチャネル周波数を受信している場合に、第２受信部５０内にて伝送される中間信号ｓ５０を上記１つの第１受信部１１ｄへ出力し、上記１つの第１受信部１１ｄは、アンテナ（例えば２ｄ）から入力された放送信号および中間信号ｓ５０に基づいて受信処理を行ってもよい。 Further, in the second receiving unit 50, at the time of normal reception, one of the plurality of first receiving units 11a to 11d (for example, 11d) and the second receiving unit 50 transmit the same channel frequency of digital broadcasting. When receiving, the intermediate signal s50 transmitted in the second receiving unit 50 is output to the one first receiving unit 11d, and the one first receiving unit 11d is transmitted from the antenna (for example, 2d). Reception processing may be performed based on the input broadcast signal and the intermediate signal s50.
　これによれば、第１受信部１１ｄ内の信号だけでなく、第２受信部５０の中間信号ｓ５０を用いて、第１受信部１１ｄの受信処理を行うことができる。これにより、第１受信部１１ｄにおけるデジタル放送の受信特性が劣化することを抑制できる。 According to this, not only the signal in the first receiving unit 11d but also the intermediate signal s50 of the second receiving unit 50 can be used to perform the reception processing of the first receiving unit 11d. As a result, it is possible to suppress deterioration of the reception characteristics of the digital broadcast in the first receiving unit 11d.
　また、上記１つの第１受信部（例えば１１ｄ）および第２受信部５０のそれぞれは、放送信号を増幅して出力する増幅部２２、５２を有し、第２受信部５０は、第２受信部５０の増幅部５２から出力された増幅信号ｓ５２を上記１つの第１受信部１１ｄへ出力し、上記１つの第１受信部１１ｄは、上記１つの第１受信部１１ｄの増幅部２２から出力された増幅信号ｓ２２および第２受信部５０の増幅部５２から出力された増幅信号ｓ５２に基づいて受信処理を行ってもよい。 Further, each of the first receiving unit (for example, 11d) and the second receiving unit 50 has amplification units 22 and 52 that amplify and output the broadcast signal, and the second receiving unit 50 receives the second reception. The amplification signal s52 output from the amplification unit 52 of the unit 50 is output to the first reception unit 11d, and the first reception unit 11d is output from the amplification unit 22 of the first reception unit 11d. Reception processing may be performed based on the amplified signal s22 and the amplified signal s52 output from the amplified unit 52 of the second receiving unit 50.
　これによれば、第１受信部１１ｄの増幅信号ｓ２２だけでなく、第２受信部５０の増幅信号ｓ５２を用いて、第１受信部１１ｄの受信処理を行うことができる。これにより、第１受信部１１ｄにおけるデジタル放送の受信特性が劣化することを抑制できる。 According to this, not only the amplified signal s22 of the first receiving unit 11d but also the amplified signal s52 of the second receiving unit 50 can be used to perform the reception processing of the first receiving unit 11d. As a result, it is possible to suppress deterioration of the reception characteristics of the digital broadcast in the first receiving unit 11d.
　また、上記１つの第１受信部（例えば１１ｄ）および第２受信部５０のそれぞれは、受信処理においてアナログ信号をデジタル信号に変換するＡＤ変換部３１、６１を有し、第２受信部５０は、第２受信部５０のＡＤ変換部６１から出力したデジタル信号ｓ６１を上記１つの第１受信部１１ｄへ出力し、上記１つの第１受信部１１ｄは、上記１つの第１受信部１１ｄのＡＤ変換部３１から出力されたデジタル信号ｓ３１および第２受信部５０のＡＤ変換部６１から出力されたデジタル信号ｓ６１に基づいて受信処理を行ってもよい。 Further, each of the first receiving unit (for example, 11d) and the second receiving unit 50 has AD conversion units 31 and 61 that convert an analog signal into a digital signal in the receiving process, and the second receiving unit 50 The digital signal s61 output from the AD conversion unit 61 of the second receiving unit 50 is output to the one first receiving unit 11d, and the one first receiving unit 11d is the AD of the one first receiving unit 11d. Reception processing may be performed based on the digital signal s31 output from the conversion unit 31 and the digital signal s61 output from the AD conversion unit 61 of the second receiving unit 50.
　これによれば、第１受信部１１ｄのデジタル信号ｓ３１だけでなく、第２受信部５０のデジタル信号ｓ６１を用いて、第１受信部１１ｄの受信処理を行うことができる。これにより、第１受信部１１ｄにおけるデジタル放送の受信特性が劣化することを抑制できる。 According to this, not only the digital signal s31 of the first receiving unit 11d but also the digital signal s61 of the second receiving unit 50 can be used to perform the reception processing of the first receiving unit 11d. As a result, it is possible to suppress deterioration of the reception characteristics of the digital broadcast in the first receiving unit 11d.
　また、第２受信部５０は、ＶＨＦ－Ｌｏｗ帯受信用またはＶＨＦ－Ｈｉｇｈ帯受信用のアンテナ２ｈから入力されたＶＬ信号またはＶＨ信号を受信処理し、もしくは、複数のアンテナ２ａ～２ｄのうちの１つのアンテナ（例えば２ｄ）から入力された地上波デジタル放送の放送信号を受信処理してもよい。 Further, the second receiving unit 50 receives and processes the VL signal or VH signal input from the antenna 2h for VHF-Low band reception or VHF-High band reception, or among a plurality of antennas 2a to 2d. The broadcast signal of the terrestrial digital broadcast input from one antenna (for example, 2d) may be received and processed.
　この構成によれば、少ない回路規模で、チャネルサーチを行い、また、ＶＬ信号およびＶＨ信号の受信を行うことができる。 According to this configuration, channel search can be performed and VL signals and VH signals can be received with a small circuit scale.
　また、複数の第１受信部１１ａ～１１ｄ、第１の合成部３３、第１の誤り訂正部３５、第２受信部５０および第２の誤り訂正部３６は、１つのＬＳＩチップＣＰ１に含まれていてもよい。 Further, a plurality of first receiving units 11a to 11d, a first combining unit 33, a first error correcting unit 35, a second receiving unit 50, and a second error correcting unit 36 are included in one LSI chip CP1. May be.
　この構成によれば、例えば、アンテナ（例えば２ｄ）から第２受信部５０に電力を取り出すための分岐部ｎ１をＬＳＩチップＣＰ１内に設けることができ、デジタル放送受信装置１を構成するＬＳＩチップＣＰ１を搭載するプリント基板を簡素化することができる。 According to this configuration, for example, a branch portion n1 for extracting power from the antenna (for example, 2d) to the second receiving unit 50 can be provided in the LSI chip CP1, and the LSI chip CP1 constituting the digital broadcast receiving device 1 can be provided. The printed circuit board on which the device is mounted can be simplified.
　（実施の形態２）
　［２－１．デジタル放送受信装置の構成］
　実施の形態２に係るデジタル放送受信装置１Ａについて説明する。実施の形態２では、第２受信部５０で受信処理したノイズ情報を含む信号に基づいて、第１受信部１１ａ内で伝送される信号からノイズを除去する例について説明する。 (Embodiment 2)
[2-1. Configuration of digital broadcast receiver]
The digital broadcast receiving device 1A according to the second embodiment will be described. In the second embodiment, an example of removing noise from a signal transmitted in the first receiving unit 11a based on a signal including noise information received and processed by the second receiving unit 50 will be described.
　まず、比較のため、従来のデジタル放送受信装置１０１の構成について説明する。 First, for comparison, the configuration of the conventional digital broadcast receiving device 101 will be described.
　図１１は、従来のデジタル放送受信装置１０１の構成を示す図である。 FIG. 11 is a diagram showing the configuration of the conventional digital broadcast receiving device 101.
　従来のデジタル放送受信装置１０１は、第１受信部１１ａと、第１の誤り訂正部３５とを備える。第１受信部１１ａは、アンテナ２ａから入力されたデジタル放送の放送信号を受信処理して第１受信処理信号ｓａを出力する。第１の誤り訂正部３５は、第１受信処理信号ｓａに対して第１の誤り訂正処理を行い、誤り訂正処理後の信号を映像・音声出力部３ａへ出力する。 The conventional digital broadcast receiving device 101 includes a first receiving unit 11a and a first error correcting unit 35. The first receiving unit 11a receives and processes the broadcast signal of the digital broadcast input from the antenna 2a and outputs the first reception processing signal sa. The first error correction unit 35 performs the first error correction processing on the first reception processing signal sa, and outputs the signal after the error correction processing to the video / audio output unit 3a.
　従来のデジタル放送受信装置１０１には、車両で発生した妨害波（例えばインパルスノイズ、スプリアスノイズなど）の影響を低減するため、第１受信部１１ａに、ノイズ除去およびノイズ低減を目的とした回路が実装されている。しかしながら、１つのアンテナ２ａから入力された、デジタル放送波および妨害波が混在した信号から、妨害波の信号成分を適切に除去することは困難であった。 In the conventional digital broadcast receiving device 101, in order to reduce the influence of interference waves (for example, impulse noise, spurious noise, etc.) generated in the vehicle, the first receiving unit 11a has a circuit for noise removal and noise reduction. It is implemented. However, it has been difficult to appropriately remove the signal component of the interfering wave from the signal in which the digital broadcasting wave and the interfering wave are mixed, which is input from one antenna 2a.
　それに対し、実施の形態２に係るデジタル放送受信装置１Ａは、入力された妨害波（ノイズ）を適切に除去するため、以下に示す構成を備えている。 On the other hand, the digital broadcast receiving device 1A according to the second embodiment has the following configuration in order to appropriately remove the input interference wave (noise).
　図１２は、実施の形態２に係るデジタル放送受信装置１Ａの構成を示す図である。なお、図１２には、デジタル放送などの放送信号が入力されるアンテナ２ａ、妨害波が入力されるアンテナ２ｊ、および、映像・音声を出力する映像・音声出力部３ａも示されている。 FIG. 12 is a diagram showing the configuration of the digital broadcast receiving device 1A according to the second embodiment. Note that FIG. 12 also shows an antenna 2a to which a broadcast signal such as a digital broadcast is input, an antenna 2j to which an interfering wave is input, and a video / audio output unit 3a for outputting video / audio.
　アンテナ２ｊは、アンテナ２ａとは異なる他のアンテナであり、妨害波を発信するノイズ源（ノイズ発生機器）の近くに配置される。アンテナ２ｊには、例えば、デジタル放送受信装置１Ａの外部で発生した妨害波が入力される。 The antenna 2j is another antenna different from the antenna 2a, and is arranged near a noise source (noise generating device) that emits an interfering wave. For example, an interfering wave generated outside the digital broadcast receiving device 1A is input to the antenna 2j.
　デジタル放送受信装置１Ａは、第１受信部１１ａと、第１の誤り訂正部３５と、第２受信部５０とを備えている。また、デジタル放送受信装置１Ａは、ＰＬＬＡ１２およびＰＬＬＢ１３を備えている。 The digital broadcast receiving device 1A includes a first receiving unit 11a, a first error correcting unit 35, and a second receiving unit 50. Further, the digital broadcast receiving device 1A includes PLLA 12 and PLLB 13.
　第１受信部１１ａ、アンテナ２ａから入力されたデジタル放送の放送信号を受信処理して第１受信処理信号ｓａを出力する。第１受信部１１ａは、チューナ部２１、ＡＤ変換部３１および復調部３２を備えている。チューナ部２１は、実施の形態１と同様に、第１の増幅部２２、ミキサ部２３、帯域フィルタ２４および第２の増幅部２５によって構成されている。 The broadcast signal of the digital broadcast input from the first receiving unit 11a and the antenna 2a is received and processed, and the first reception processing signal sa is output. The first receiving unit 11a includes a tuner unit 21, an AD conversion unit 31, and a demodulation unit 32. The tuner unit 21 is composed of a first amplification unit 22, a mixer unit 23, a band filter 24, and a second amplification unit 25, as in the first embodiment.
　ＡＤ変換部３１は、第２の増幅部２５で増幅されたアナログ信号をデジタル信号ｓ３１に変換して復調部３２へ出力する。復調部３２は、デジタル信号ｓ３１を復調し、第１受信部１１ａの出力信号である第１受信処理信号ｓａを出力する。本実施の形態の復調部３２は、第１受信部１１ａ内にて伝送される信号からノイズを除去するためのノイズ除去部８０を備えている。ノイズ除去部８０の詳細については後述する。 The AD conversion unit 31 converts the analog signal amplified by the second amplification unit 25 into a digital signal s31 and outputs it to the demodulation unit 32. The demodulation unit 32 demodulates the digital signal s31 and outputs the first reception processing signal sa which is the output signal of the first reception unit 11a. The demodulation unit 32 of the present embodiment includes a noise removal unit 80 for removing noise from the signal transmitted in the first reception unit 11a. The details of the noise removing unit 80 will be described later.
　第１の誤り訂正部３５は、第１受信処理信号ｓａに対して第１の誤り訂正処理を行い、誤り訂正処理後の信号を映像・音声出力部３ａへ出力する。なお、第１の誤り訂正部３５は、復号処理を行ってもよい。 The first error correction unit 35 performs the first error correction processing on the first reception processing signal sa, and outputs the signal after the error correction processing to the video / audio output unit 3a. The first error correction unit 35 may perform decoding processing.
　第２受信部５０は、外部で発生した妨害波を入力するために付加された受信部である。第２受信部５０は、妨害波によって入力された信号を受信処理し、ノイズ情報を含む第２受信処理信号ｓ２を第１受信部１１ａへ出力する。 The second receiving unit 50 is a receiving unit added to input an externally generated interfering wave. The second receiving unit 50 receives and processes the signal input by the interference wave, and outputs the second reception processing signal s2 including the noise information to the first receiving unit 11a.
　第２受信部５０は、チューナ部５１、ＡＤ変換部６１および復調部６２を備えている。チューナ部５１は、実施の形態１と同様に、第１の増幅部５２、ミキサ部５３、帯域フィルタ５４および第２の増幅部５５によって構成されている。 The second receiving unit 50 includes a tuner unit 51, an AD conversion unit 61, and a demodulation unit 62. The tuner section 51 is composed of a first amplification section 52, a mixer section 53, a band filter 54, and a second amplification section 55, as in the first embodiment.
　ＡＤ変換部６１は、第２の増幅部５５で増幅されたアナログ信号をデジタル信号ｓ６１に変換して復調部６２へ出力する。復調部６２は、デジタル信号ｓ６１を復調し、第２受信部５０の出力信号である第２受信処理信号ｓ２を第１受信部１１ａの復調部３２へ出力する。 The AD conversion unit 61 converts the analog signal amplified by the second amplification unit 55 into a digital signal s61 and outputs it to the demodulation unit 62. The demodulation unit 62 demodulates the digital signal s61 and outputs the second reception processing signal s2, which is the output signal of the second reception unit 50, to the demodulation unit 32 of the first reception unit 11a.
　前述したように、第１受信部１１ａの復調部３２は、ノイズ除去部８０を備えている。アンテナ２ａおよびアンテナ２ｊに同一のノイズ源の信号が入力される場合、アンテナ２ａから入力された信号およびアンテナ２ｊから入力された信号には相関がある。そこで、デジタル放送受信装置１Ａでは、第２受信部５０から出力された第２受信処理信号ｓ２を利用し、第１受信部１１ａ内にて伝送される信号に対しノイズ除去を行う。 As described above, the demodulation unit 32 of the first receiving unit 11a includes a noise removing unit 80. When the signals of the same noise source are input to the antenna 2a and the antenna 2j, there is a correlation between the signal input from the antenna 2a and the signal input from the antenna 2j. Therefore, the digital broadcast receiving device 1A uses the second reception processing signal s2 output from the second receiving unit 50 to remove noise from the signal transmitted in the first receiving unit 11a.
　このように、本実施の形態のデジタル放送受信装置１Ａは、第２受信部５０から出力された第２受信処理信号ｓ２を利用し、第１受信部１１ａ内にて伝送される信号に対しノイズ除去を行う。これにより、デジタル放送受信装置１Ａにおいて、デジタル放送の受信特性が劣化することを抑制できる。 As described above, the digital broadcast receiving device 1A of the present embodiment uses the second reception processing signal s2 output from the second receiving unit 50, and makes noise with respect to the signal transmitted in the first receiving unit 11a. Perform removal. As a result, it is possible to prevent the digital broadcast receiving device 1A from deteriorating the reception characteristics of the digital broadcast.
　［２－２．ノイズ除去部の構成］
　次に、ノイズ除去部８０の構成について図１３および図１４を参照しながら説明する。 [2-2. Configuration of noise removal unit]
Next, the configuration of the noise removing unit 80 will be described with reference to FIGS. 13 and 14.
　図１３は、デジタル放送受信装置１Ａのノイズ除去部８０の構成を示す図である。 FIG. 13 is a diagram showing the configuration of the noise removing unit 80 of the digital broadcast receiving device 1A.
　ノイズ除去部８０は、復調部３２にて復調処理した後のデジタル情報信号ｓ３２に対してノイズ除去を行うことで、ノイズが除去された後のノイズ除去信号ｓ８２を第１の誤り訂正部３５へ出力する。 The noise removing unit 80 removes noise from the digital information signal s32 after the demodulation processing by the demodulation unit 32, so that the noise removing signal s82 after the noise is removed is sent to the first error correction unit 35. Output.
　図１３に示すように、ノイズ除去部８０は、信号調整部８１および加減算部８２を有している。信号調整部８１には、第２受信部５０から出力されたノイズ情報を含む第２受信処理信号ｓ２が入力される。信号調整部８１は、第２受信処理信号ｓ２の振幅、位相およびタイミングの少なくとも１つを調整（補正）し、調整後のノイズ情報信号ｓ８１を加減算部８２へ出力する。加減算部８２には、復調部３２で復調処理された後のデジタル情報信号ｓ３２および調整後のノイズ情報信号ｓ８１が入力される。加減算部８２は、デジタル情報信号ｓ３２から調整後のノイズ情報信号ｓ８１を差し引き、ノイズ除去信号ｓ８２を出力する。このようにノイズ除去部８０は、ノイズ情報を含む第２受信処理信号ｓ２に基づいてノイズ除去処理を行い、処理された処理信号を第１の誤り訂正部３５へ出力する。 As shown in FIG. 13, the noise removing unit 80 has a signal adjusting unit 81 and an addition / subtraction unit 82. The second reception processing signal s2 including the noise information output from the second reception unit 50 is input to the signal adjustment unit 81. The signal adjusting unit 81 adjusts (corrects) at least one of the amplitude, phase, and timing of the second reception processing signal s2, and outputs the adjusted noise information signal s81 to the addition / subtraction unit 82. The digital information signal s32 after the demodulation processing by the demodulation unit 32 and the noise information signal s81 after adjustment are input to the addition / subtraction unit 82. The addition / subtraction unit 82 subtracts the adjusted noise information signal s81 from the digital information signal s32, and outputs the noise removal signal s82. In this way, the noise removing unit 80 performs noise removing processing based on the second reception processing signal s2 including noise information, and outputs the processed processing signal to the first error correction unit 35.
　なお、ノイズ除去部８０は、信号調整部８１にて振幅および位相等の調整を行う際、ノイズ除去後の受信品質がよくなるように、例えばノイズを打ち消すような補正係数を与えて調整を行ってもよい。また、ノイズ除去部８０は、アンテナ２ｊとノイズ源（ノイズ発生機器)との配置関係から予め算出された補正係数に基づいて上記調整を行ってもよい。 When the signal adjusting unit 81 adjusts the amplitude, phase, etc., the noise removing unit 80 adjusts by giving a correction coefficient that cancels out noise, for example, so that the reception quality after noise removal is improved. May be good. Further, the noise removing unit 80 may make the above adjustment based on a correction coefficient calculated in advance from the arrangement relationship between the antenna 2j and the noise source (noise generating device).
　以下、ノイズ除去部８０のさらに詳しい構成について説明する。 Hereinafter, a more detailed configuration of the noise removing unit 80 will be described.
　図１４は、図１３に示すノイズ除去部８０の詳細構成を示す図である。 FIG. 14 is a diagram showing a detailed configuration of the noise removing unit 80 shown in FIG.
　図１４に示すように、信号調整部８１は、フィルタ係数を有するフィルタ部８１ａ、および、相関関係を求める相関部８１ｂを有している。図１４には、デジタル情報信号ｓ３２が信号ｆ１（ｔ）で示され、ノイズ情報を含む第２受信処理信号ｓ２が信号ｆ５（ｔ）で示され、調整後のノイズ情報信号ｓ８１が信号Ｆ５（ｔ）で示され、ノイズ除去信号ｓ８２が信号（ｆ１（ｔ）－Ｆ５（ｔ））で示されている。 As shown in FIG. 14, the signal adjusting unit 81 has a filter unit 81a having a filter coefficient and a correlation unit 81b for obtaining a correlation. Figure 14 is a digital information signal s32 is indicated by the signal f 1 (t), the second reception processing signal s2 containing noise information is indicated by the signal f 5 (t), the adjusted noise information signal s81 signal It is indicated by F 5 (t), and the noise reduction signal s82 is indicated by a signal (f 1 (t) -F 5 (t)).
　まず、フィルタ部８１ａに、ノイズ情報を含む信号ｆ５（ｔ）が入力される。フィルタ部８１ａは、適宜更新されるフィルタ係数に基づいて信号ｆ５（ｔ）に対して振幅、位相およびタイミングの少なくとも１つを調整し、調整後のノイズ情報信号である信号Ｆ５（ｔ）を加減算部８２に出力する。加減算部８２には、信号Ｆ５（ｔ）およびデジタル情報信号である信号ｆ１（ｔ）が入力される。加減算部８２は、信号ｆ１（ｔ）から信号Ｆ５（ｔ）を差し引くことで、ノイズ除去信号である信号（ｆ１（ｔ）－Ｆ５（ｔ））を生成する。 First, the filter unit 81a, the signal f 5 containing noise information (t) is input. Filter unit 81a adjusts the amplitude, at least one of phase and timing for the signal f 5 (t) based on the filter coefficients to be appropriately updated, the signal F 5 is a noise information signal after adjustment (t) Is output to the addition / subtraction unit 82. A signal F 5 (t) and a signal f 1 (t), which is a digital information signal, are input to the addition / subtraction unit 82. Subtraction unit 82, by subtracting the signal F 5 (t) from the signal f 1 (t), and generates a signal which is a noise reduction signal (f 1 (t) -F 5 (t)).
　相関部８１ｂは、信号（ｆ１（ｔ）－Ｆ５（ｔ））と信号ｆ５（ｔ）との相関をとり、相関に対応したフィルタ係数をフィルタ部８１ａへ出力する。具体的には、相関部８１ｂは、（式１）に示すように、信号（ｆ１（ｔ）－Ｆ５（ｔ））と信号ｆ５（ｔ）とを掛け合わせることで相関ｅ（ｍ，ｔ）を求める。 The correlation unit 81b correlates the signal (f 1 (t) -F 5 (t)) with the signal f 5 (t), and outputs the filter coefficient corresponding to the correlation to the filter unit 81a. Specifically, as shown in (Equation 1), the correlation unit 81b multiplies the signal (f 1 (t) −F 5 (t)) by the signal f 5 (t) to correlate e (m). , T) is calculated.
Figure JPOXMLDOC01-appb-M000001
Figure JPOXMLDOC01-appb-M000001
　相関部８１ｂは、信号（ｆ１（ｔ）－Ｆ５（ｔ））と信号ｆ５（ｔ－ｍ）との相関（ｍ，ｔ）が無くなるようにフィルタ係数を決定する。ここで相関が無くなるとは、ノイズを除去した信号（ｆ１（ｔ）－Ｆ５（ｔ））にノイズ情報を含む信号ｆ５（ｔ）が含まれていないことを意味する。フィルタ係数は、例えば、ＭＭＳＥ（Ｍｉｎｉｍｕｍ　Ｍｅａｎ　Ｓｑｕａｒｅ　Ｅｒｒｏｒ）、ＬＭＳ（Ｌｅａｓｔ　Ｍｅａｎ　Ｓｑｕａｒｅ）、または、ＲＬＳ（Ｒｅｃｕｒｓｉｖｅ　Ｌｅａｓｔ　Ｓｑｕａｒｅ）などの適応フィルタを用いた演算によって求められる。 The correlation unit 81b determines the filter coefficient so that the correlation (m, t) between the signal (f 1 (t) −F 5 (t)) and the signal f 5 (tm) disappears. Here, when the correlation disappears, it means that the signal f 5 (t) containing the noise information is not included in the signal from which the noise has been removed (f 1 (t) -F 5 (t)). The filter coefficient can be obtained by calculation using an adaptive filter such as MMSE (Minimum Mean Square), LMS (Least Mean Square), or RLS (Recursive First Square).
　なお、（式１）におけるｍはタップ位置を表す。信号ｆ５（ｔ）に関してタイミングのずれがない場合、タップ数は１で、ｍ＝０に設定されるが、タイミングのずれがある場合、複数のタップ数が設定される。例えば、タップ数が３である場合、ｍ＝－１，０，１に設定される。複数のタップが設定されると、それに応じた複数のフィルタ係数が導出される。 In addition, m in (Equation 1) represents a tap position. If there is no deviation of the timing with respect to the signal f 5 (t), the number of taps is 1, but is set to m = 0, if there is a difference in timing, the number plurality of taps are set. For example, when the number of taps is 3, m = -1,0,1 is set. When a plurality of taps are set, a plurality of filter coefficients corresponding to the taps are derived.
　相関部８１ｂは、複数のタップで表された（式１）に基づいて複数の相関をとり、（式２）に示すように複数のフィルタ係数ｃｔ＋１（ｍ）を導出し、フィルタ部８１ａへ出力する。 The correlation unit 81b obtains a plurality of correlations based on (Equation 1) represented by a plurality of taps, derives a plurality of filter coefficients ct + 1 (m) as shown in (Equation 2), and sends them to the filter unit 81a. Output.
Figure JPOXMLDOC01-appb-M000002
Figure JPOXMLDOC01-appb-M000002
　フィルタ部８１ａは、入力されたフィルタ係数に基づいて、信号ｆ５（ｔ）を調整し、信号Ｆ５（ｔ）を出力する。ノイズ除去部８０は、これらの処理を所定時間に繰り返し、信号（ｆ１（ｔ）－Ｆ５（ｔ））と信号ｆ５（ｔ－ｍ）との相関が無くなるようにフィルタ係数を更新する。これによりノイズ除去部８０は、ノイズ除去処理を実行する。 Filter unit 81a based on the input filter coefficient, and adjusts the signal f 5 (t), and outputs the signal F 5 a (t). The noise removing unit 80 repeats these processes at a predetermined time, and updates the filter coefficient so that the correlation between the signal (f 1 (t) −F 5 (t)) and the signal f 5 (tm) disappears. .. As a result, the noise removing unit 80 executes the noise removing process.
　なお、（式２）におけるμは所定のステップサイズである。ステップサイズμを大きくすると収束の速さや追従性が高まるが、ばたつきが大きくなり、収束後に残留する誤差が大きくなる。ステップサイズμは、デジタル放送受信装置１Ａに求められる追従性や残留誤差の大きさに合わせ適宜設定される。 Note that μ in (Equation 2) is a predetermined step size. Increasing the step size μ increases the speed of convergence and followability, but the fluttering increases and the error remaining after convergence increases. The step size μ is appropriately set according to the followability and the magnitude of the residual error required for the digital broadcast receiving device 1A.
　なお、上記では、フィルタ係数が、信号（ｆ１（ｔ）－Ｆ５（ｔ））と信号ｆ５（ｔ－ｍ）との相関が無くなるように更新されているが、それに限られず、ノイズ除去後の受信品質（ガード相関や受信信号の変調誤差比）に基づいて、フィルタ係数が更新されてもよい。フィルタ係数は逐次更新されるが、ノイズ除去後の信号が所定の受信品質値を満たした場合に、フィルタ係数の更新が停止されてもよいし、フィルタ係数の更新のステップサイズを現在のステップサイズより小さくしてもよい。 In the above, the filter coefficient is updated so that there is no correlation between the signal (f 1 (t) -F 5 (t)) and the signal f 5 (tm), but the noise is not limited to this. The filter coefficient may be updated based on the reception quality after removal (guard correlation or modulation error ratio of the received signal). The filter coefficient is updated sequentially, but when the signal after noise removal meets a predetermined reception quality value, the update of the filter coefficient may be stopped, and the step size for updating the filter coefficient is set to the current step size. It may be smaller.
　また、図１３および図１４では、加減算部８２が、デジタル情報信号ｓ３２から調整後のノイズ情報信号ｓ８１を差し引く減算器である例を示したが、それに限られない。例えば、フィルタ係数を差し引く係数にした場合、加減算部８２は加算器であってもよい。 Further, in FIGS. 13 and 14, an example is shown in which the addition / subtraction unit 82 is a subtractor for subtracting the adjusted noise information signal s81 from the digital information signal s32, but the present invention is not limited to this. For example, when the coefficient is obtained by subtracting the filter coefficient, the addition / subtraction unit 82 may be an adder.
　また、上記では、ノイズ除去部８０が、復調部３２にて復調処理したデジタル情報信号ｓ３２に対してノイズ除去を行う例を示したが、それに限られない。ノイズ除去部８０は、周波数変換（キャリア周波数のずれの補正と中間周波数信号をベースバンドへ変換する処理）した信号、または、レート変換（サンプリングタイミングの補正）した信号に対してノイズ除去を行ってもよいし、周波数変換する前の信号に対してノイズ除去を行ってもよい。また、ノイズ除去部８０は、ＦＦＴ（Ｆａｓｔ　Ｆｏｕｒｉｅｒ　Ｔｒａｎｓｆｏｒｍ）変換前やＦＦＴ変換後の信号に対してノイズ除去を行ってもよい。 Further, in the above, an example in which the noise removing unit 80 removes noise from the digital information signal s32 demodulated by the demodulating unit 32 is shown, but the present invention is not limited to this. The noise removing unit 80 removes noise from a frequency-converted signal (correction of carrier frequency deviation and conversion of an intermediate frequency signal to a baseband) or rate-converted (sampling timing correction) signal. Alternatively, noise removal may be performed on the signal before frequency conversion. Further, the noise removing unit 80 may remove noise from the signal before the FFT (Fast Fourier Transform) conversion or after the FFT conversion.
　また、ノイズ除去部８０は、常時動作するのでなく、その時々に動作してノイズ除去を行うような間欠動作を行ってもよい。また、ノイズ除去部８０は、間欠動作を行い、間欠動作のうちの作動期間にノイズ除去信号ｓ８２を出力し、間欠動作のうちの非作動期間にノイズ除去を行わずにデジタル情報信号ｓ３２を出力してもよい。また、ノイズ除去部８０は常時動作するが、係数の更新は間欠的に更新するとしてもよい。 Further, the noise removing unit 80 does not always operate, but may perform an intermittent operation such that it operates at each time to remove noise. Further, the noise removing unit 80 performs an intermittent operation, outputs a noise removing signal s82 during the operating period of the intermittent operation, and outputs a digital information signal s32 without performing noise removing during the non-operating period of the intermittent operation. You may. Further, although the noise removing unit 80 always operates, the coefficient may be updated intermittently.
　図１５は、デジタル放送受信装置１Ａに入力されるノイズの一例を示す図である。図１５には、車載ノイズが、ｘ（μｓ）およびｙ（μｓ）の周期で発生している例が示されている。図１５に示すように、ノイズが間欠的に発生している場合、ノイズ除去部８０は、間欠的に発生するノイズに合わせてノイズ除去を行ってもよい。ノイズの発生しない期間は、誤って必要な信号を除去することがないように、ノイズ除去部８０は、ノイズ除去の動作を停止してもよい。また、ノイズ除去部８０は、除去すべきノイズの強度に閾値を設け、閾値以上のノイズが発生した場合に、そのノイズを除去してもよい。 FIG. 15 is a diagram showing an example of noise input to the digital broadcast receiving device 1A. FIG. 15 shows an example in which vehicle-mounted noise is generated in a period of x (μs) and y (μs). As shown in FIG. 15, when noise is generated intermittently, the noise removing unit 80 may perform noise removal in accordance with the intermittently generated noise. During the period when noise is not generated, the noise removing unit 80 may stop the noise removing operation so as not to accidentally remove the necessary signal. Further, the noise removing unit 80 may set a threshold value for the intensity of the noise to be removed, and remove the noise when the noise exceeding the threshold value is generated.
　なお、ノイズ除去部８０が動作する期間は、第２受信部５０に入力された信号レベルが所定の値よりも大きいときであってもよいし、第２受信部５０の信号品質値が所定の値よりも小さいときであってもよい。また、第１受信部１１ａの信号品質値が所定の値よりも大きい値を示すときであってもよい。また、ノイズ除去部８０は、ノイズの発生周期、継続時間を予測して間欠的に動作してもよい。 The period during which the noise removing unit 80 operates may be when the signal level input to the second receiving unit 50 is higher than a predetermined value, or the signal quality value of the second receiving unit 50 is predetermined. It may be less than the value. Further, it may be when the signal quality value of the first receiving unit 11a shows a value larger than a predetermined value. Further, the noise removing unit 80 may operate intermittently by predicting the noise generation cycle and duration.
　このように、実施の形態２のデジタル放送受信装置１Ａは、アンテナ２ａから入力されたデジタル放送の放送信号を受信処理して第１受信処理信号ｓａを出力する第１受信部１１ａと、アンテナ２ａとは異なるアンテナ２ｊから入力された信号を受信処理して第２受信処理信号ｓ２を第１受信部１１ａへ出力する第２受信部５０と、を備える。第２受信部５０は、外部で発生した妨害波によって入力された信号を受信処理して、ノイズ情報を含む第２受信処理信号ｓ２を第１受信部１１ａに出力する。第１受信部１１ａは、アンテナ２ａから入力された放送信号および第２受信部５０から出力された第２受信処理信号ｓ２に基づいて受信処理を行い、この受信処理後の処理信号を第１受信処理信号ｓａとして出力する。第１の誤り訂正部３５は、第１受信処理信号ｓａに対して第１の誤り処理を行う。 As described above, the digital broadcast receiving device 1A of the second embodiment receives and processes the broadcast signal of the digital broadcast input from the antenna 2a and outputs the first reception processing signal sa, and the antenna 2a and the first receiving unit 11a. A second receiving unit 50 that receives and processes a signal input from an antenna 2j different from the above and outputs a second reception processing signal s2 to the first receiving unit 11a. The second receiving unit 50 receives and processes the signal input by the interference wave generated externally, and outputs the second receiving processing signal s2 including the noise information to the first receiving unit 11a. The first receiving unit 11a performs reception processing based on the broadcast signal input from the antenna 2a and the second reception processing signal s2 output from the second receiving unit 50, and first receives the processed signal after the reception processing. Output as a processing signal sa. The first error correction unit 35 performs the first error processing on the first reception processing signal sa.
　なお、上記では、デジタル放送受信装置１Ａが、１つの第１受信部１１ａを備えている例を示したが、それに限られない。デジタル放送受信装置１Ａは、ダイバーシティ受信を行うために複数の第１受信部１１ａ～１１ｄ（図１８参照）を備えていてもよい。その場合、第２受信部５０から複数の第１受信部１１ａ～１１ｄのそれぞれに第２受信処理信号ｓ２が出力され、複数の第１受信部１１ａ～１１ｄのそれぞれは、複数のアンテナ２ａ～２ｄ（図１８参照）から入力された放送信号および第２受信部５０から出力された第２受信処理信号ｓ２に基づいて受信処理を行ってもよい。 Note that the above shows an example in which the digital broadcast receiving device 1A includes one first receiving unit 11a, but the present invention is not limited to this. The digital broadcast receiving device 1A may include a plurality of first receiving units 11a to 11d (see FIG. 18) for performing diversity reception. In that case, the second reception processing signal s2 is output from the second receiving unit 50 to each of the plurality of first receiving units 11a to 11d, and each of the plurality of first receiving units 11a to 11d has a plurality of antennas 2a to 2d. Reception processing may be performed based on the broadcast signal input from (see FIG. 18) and the second reception processing signal s2 output from the second reception unit 50.
　［２－３．実施の形態２の変形例１］
　実施の形態２の変形例１に係るデジタル放送受信装置１Ａについて説明する。この変形例１では、デジタル情報信号ｓ３２およびノイズ除去信号ｓ８２のうち、信号の受信品質が高いほうを第１受信処理信号ｓａとして出力する例について説明する。 [2-3. Modification 1 of the second embodiment]
The digital broadcast receiving device 1A according to the first modification of the second embodiment will be described. In the first modification, an example of outputting the digital information signal s32 and the noise removal signal s82 having the higher signal reception quality as the first reception processing signal sa will be described.
　図１６は、実施の形態２の変形例１に係るデジタル放送受信装置１Ａの構成の一部を示す図である。 FIG. 16 is a diagram showing a part of the configuration of the digital broadcast receiving device 1A according to the first modification of the second embodiment.
　図１６に示すように、第１受信部１１ａは、ノイズ除去部８０に加え、信号選択部９０を備えている。信号選択部９０は、ノイズ除去部８０の出力側、すなわちノイズ除去部８０と第１の誤り訂正部３５との間に設けられている。信号選択部９０は、受信品質判定部９１ａ、９１ｂと、比較部９２と、切替部９３と有している。 As shown in FIG. 16, the first receiving unit 11a includes a signal selection unit 90 in addition to the noise removing unit 80. The signal selection unit 90 is provided on the output side of the noise removal unit 80, that is, between the noise removal unit 80 and the first error correction unit 35. The signal selection unit 90 includes reception quality determination units 91a and 91b, a comparison unit 92, and a switching unit 93.
　受信品質判定部９１ａは、ノイズ除去処理が施されていないデジタル情報信号ｓ３２の受信品質を判定し、受信品質判定部９１ｂは、ノイズ除去部８０によってノイズ除去処理が施されたノイズ除去信号ｓ８２の受信品質を判定する。受信品質の判定基準は、例えば、所定周波数帯の信号強度およびノイズを考慮した５段階評価により予め設定されている。 The reception quality determination unit 91a determines the reception quality of the digital information signal s32 that has not been subjected to the noise removal processing, and the reception quality determination unit 91b is the noise removal signal s82 that has been subjected to the noise removal processing by the noise removal unit 80. Judge the reception quality. The criteria for determining the reception quality are set in advance by, for example, a five-step evaluation in consideration of the signal strength and noise in a predetermined frequency band.
　比較部９２は、受信品質判定部９１ａ、９１ｂの判定結果を比較し、切替部９３の作動を制御する。切替部９３は、比較部９２によって択一的に切り替えられるスイッチであり、ノイズ除去部８０と第１の誤り訂正部３５との間に設けられている。比較部９２は、判定結果に基づいて、信号の受信品質が高いほうを信号選択部９０の出力とする。例えば、比較部９２は、デジタル情報信号ｓ３２のほうがノイズ除去信号ｓ８２よりも信号の受信品質が高いと判定した場合、デジタル情報信号ｓ３２が出力されるように、切替部９３を作動させる。また、比較部９２は、ノイズ除去信号ｓ８２のほうがデジタル情報信号ｓ３２よりも信号の受信品質が高いと判定した場合、ノイズ除去信号ｓ８２が出力されるように切替部９３を作動させる。 The comparison unit 92 compares the determination results of the reception quality determination units 91a and 91b, and controls the operation of the switching unit 93. The switching unit 93 is a switch that can be selectively switched by the comparison unit 92, and is provided between the noise removing unit 80 and the first error correction unit 35. Based on the determination result, the comparison unit 92 sets the higher signal reception quality as the output of the signal selection unit 90. For example, when the comparison unit 92 determines that the digital information signal s32 has higher signal reception quality than the noise removal signal s82, the comparison unit 92 operates the switching unit 93 so that the digital information signal s32 is output. Further, when the comparison unit 92 determines that the noise removal signal s82 has higher signal reception quality than the digital information signal s32, the comparison unit 92 operates the switching unit 93 so that the noise removal signal s82 is output.
　信号選択部９０の出力信号は、第１受信部１１ａの第１受信処理信号ｓａとして第１の誤り訂正部３５へ出力される。この構成によれば、ノイズ除去を行う必要のない状況、または、ノイズ除去を行うことで却って受信品質を悪くする状況においても、安定した受信品質を確保することができる。 The output signal of the signal selection unit 90 is output to the first error correction unit 35 as the first reception processing signal sa of the first reception unit 11a. According to this configuration, stable reception quality can be ensured even in a situation where it is not necessary to perform noise removal or a situation in which reception quality is rather deteriorated by performing noise removal.
　なお、受信品質判定部９１ａ、９１ｂは、信号の搬送波対雑音比（Ｃ／Ｎ（Ｃ／Ｉ））によって受信品質を判定してもよい。また、受信品質判定部９１ａ、９１ｂは、ＯＦＤＭ（Ｏｒｔｈｏｇｏｎａｌ　Ｆｒｅｑｕｅｎｃｙ　Ｄｉｖｉｓｉｏｎ　Ｍｕｌｔｉｐｌｅｘｉｎｇ）時間領域のガードインターバルとコピー部分の相関の相関量から受信品質を判定してもよいし、ＦＦＴ後の周波数領域の受信信号のＭＥＲなどで受信品質を判定してもよい。 Note that the reception quality determination units 91a and 91b may determine the reception quality based on the carrier-to-noise ratio (C / N (C / I)) of the signal. Further, the reception quality determination units 91a and 91b may determine the reception quality from the correlation amount between the guard interval in the OFDM (Orthogonal Frequency Division Multiplexing) time domain and the copy portion, or the reception signal in the frequency domain after FFT. The reception quality may be determined by MER or the like.
　［２－４．実施の形態２の変形例２］
　実施の形態２の変形例２に係るデジタル放送受信装置１Ａについて説明する。この変形例２では、第１受信部１１ａが、第２受信部５０に対して同期情報を出力する例について説明する。 [2-4. Modification 2 of the second embodiment]
The digital broadcast receiving device 1A according to the second modification of the second embodiment will be described. In this modification 2, an example in which the first receiving unit 11a outputs synchronization information to the second receiving unit 50 will be described.
　図１７は、実施の形態２の変形例２に係るデジタル放送受信装置１Ａの構成を示す図である。 FIG. 17 is a diagram showing the configuration of the digital broadcast receiving device 1A according to the second modification of the second embodiment.
　図１７に示すように、変形例２のデジタル放送受信装置１Ａでは、第１受信部１１ａが、第２受信部５０の作動を第１受信部１１ａの作動に同期させるための同期情報を第２受信部５０へ出力する。具体的には、第１受信部１１ａの復調部３２が、上記の同期情報を第２受信部５０の復調部６２へ出力する。第２受信部５０は、受け付けた同期情報に基づいて、受信処理を行う。 As shown in FIG. 17, in the digital broadcast receiving device 1A of the second modification, the first receiving unit 11a provides the synchronization information for synchronizing the operation of the second receiving unit 50 with the operation of the first receiving unit 11a. Output to the receiving unit 50. Specifically, the demodulation unit 32 of the first reception unit 11a outputs the above synchronization information to the demodulation unit 62 of the second reception unit 50. The second receiving unit 50 performs reception processing based on the received synchronization information.
　同期情報には、通常受信時の信号におけるキャリア周波数のずれ量やサンプリングのずれ量に関する情報が含まれている。例えば、第２受信部５０に接続されるアンテナ２ｊは、主として妨害波を受信するために配置されるため、地上波デジタル放送の信号電力が低く、デジタル放送に対してキャリア周波数の同期やサンプリングの同期が困難となる場合がある。そこで、第１受信部１１ａで取得したキャリア周波数のずれ量やサンプリングのずれ量を含む同期情報を、第２受信部５０に出力することで、第２受信部５０にてキャリア周波数の同期やサンプリングの同期が可能となる。 The synchronization information includes information on the amount of carrier frequency deviation and the amount of sampling deviation in the signal during normal reception. For example, since the antenna 2j connected to the second receiving unit 50 is arranged mainly for receiving the interfering wave, the signal power of the terrestrial digital broadcasting is low, and the carrier frequency is synchronized or sampled with respect to the digital broadcasting. It may be difficult to synchronize. Therefore, by outputting the synchronization information including the carrier frequency deviation amount and the sampling deviation amount acquired by the first receiving unit 11a to the second receiving unit 50, the carrier frequency synchronization and sampling are performed by the second receiving unit 50. Can be synchronized.
　［２－５．効果等］
　本実施の形態のデジタル放送受信装置１Ａは、アンテナ２ａから入力されたデジタル放送の放送信号を受信処理して第１受信処理信号ｓａを出力する第１受信部１１ａと、アンテナ２ａとは異なるアンテナ２ｊから入力された信号を受信処理して第２受信処理信号ｓ２を第１受信部１１ａへ出力する第２受信部５０と、を備える。第１受信部１１ａは、アンテナ２ａから入力された放送信号および第２受信部５０から出力された第２受信処理信号ｓ２に基づいて受信処理を行い、この受信処理後の処理信号を第１受信処理信号ｓａとして出力する。誤り訂正部３５は、第１受信処理信号ｓａに対して誤り処理を行う。 [2-5. Effect, etc.]
The digital broadcast receiving device 1A of the present embodiment has a first receiving unit 11a that receives and processes a digital broadcast broadcast signal input from the antenna 2a and outputs a first reception processing signal sa, and an antenna different from the antenna 2a. A second receiving unit 50 that receives and processes the signal input from 2j and outputs the second reception processing signal s2 to the first receiving unit 11a is provided. The first receiving unit 11a performs reception processing based on the broadcast signal input from the antenna 2a and the second reception processing signal s2 output from the second receiving unit 50, and first receives the processed signal after the reception processing. Output as a processing signal sa. The error correction unit 35 performs error processing on the first reception processing signal sa.
　このように、第２受信部５０から出力された第２受信処理信号ｓ２を利用し、第１受信部１１ａ内にて伝送される信号に対しノイズ除去を行うことで、デジタル放送の受信特性が劣化することを抑制できる。 In this way, by using the second reception processing signal s2 output from the second reception unit 50 and removing noise from the signal transmitted in the first reception unit 11a, the reception characteristics of digital broadcasting can be improved. Deterioration can be suppressed.
　また、第２受信部５０は、外部で発生した妨害波によって入力された信号を上記入力された信号とし、受信処理して、ノイズ情報を含む第２受信処理信号ｓ２を第１受信部１１ａに出力してもよい。 Further, the second receiving unit 50 uses the signal input by the disturbing wave generated externally as the input signal, performs reception processing, and sends the second reception processing signal s2 including noise information to the first receiving unit 11a. It may be output.
　このように、第２受信部５０が、妨害波によって入力された信号を受信処理して第２受信処理信号ｓ２を出力することで、第１受信部１１ａは、ノイズ情報を含む第２受信処理信号ｓ２を利用してノイズ除去を行うことができる。これにより、第１受信部１１ａにおけるデジタル放送の受信特性が劣化することを抑制できる。 In this way, the second receiving unit 50 receives and processes the signal input by the interference wave and outputs the second receiving processing signal s2, so that the first receiving unit 11a performs the second receiving processing including noise information. Noise can be removed by using the signal s2. As a result, it is possible to suppress deterioration of the reception characteristics of the digital broadcast in the first receiving unit 11a.
　また、第２受信部５０は、複数のアンテナ２ａ～２ｄよりもノイズ源の近くに位置する他のアンテナ２ｊから入力された信号を上記入力された信号とし、受信処理してもよい。 Further, the second receiving unit 50 may use the signal input from another antenna 2j located closer to the noise source than the plurality of antennas 2a to 2d as the input signal and perform reception processing.
　このように、第２受信部５０が、ノイズ源の近くに位置する他のアンテナ２ｊから入力された信号を受信処理して第２受信処理信号ｓ２を出力することで、第１受信部１１ａは、ノイズ情報を含む第２受信処理信号ｓ２を利用してノイズ除去を行うことができる。これにより、第１受信部１１ａにおけるデジタル放送の受信特性が劣化することを抑制できる。 In this way, the second receiving unit 50 receives and processes the signal input from the other antenna 2j located near the noise source and outputs the second receiving processing signal s2, so that the first receiving unit 11a , Noise can be removed by using the second reception processing signal s2 including noise information. As a result, it is possible to suppress deterioration of the reception characteristics of the digital broadcast in the first receiving unit 11a.
　また、複数の第１受信部１１ａ～１１ｄのそれぞれは、第１受信部１１ａ～１１ｄにて復調処理した後のデジタル情報信号ｓ３２に対してノイズ除去を行うノイズ除去部８０を有し、ノイズ除去部８０は、ノイズ情報を含む第２受信処理信号ｓ２に基づいてノイズ除去を行うことで、第２受信処理信号ｓ２に基づいて処理された処理信号を出力してもよい。 Further, each of the plurality of first receiving units 11a to 11d has a noise removing unit 80 that removes noise from the digital information signal s32 after the demodulation processing by the first receiving units 11a to 11d. The unit 80 may output the processed signal processed based on the second reception processing signal s2 by performing noise removal based on the second reception processing signal s2 including the noise information.
　このように、第１受信部１１ａ～１１ｄに設けられたノイズ除去部８０でノイズ除去を行うことで、第１受信部１１ａ～１１ｄにおけるデジタル放送の受信特性が劣化することを抑制できる。 In this way, by removing noise with the noise removing units 80 provided in the first receiving units 11a to 11d, it is possible to suppress deterioration of the reception characteristics of the digital broadcast in the first receiving units 11a to 11d.
　また、ノイズ除去部８０は、ノイズ情報を含む第２受信処理信号ｓ２に対して振幅、位相およびタイミングの少なくとも１つを調整した後の調整後のノイズ情報信号ｓ８１をデジタル情報信号ｓ３２から差し引くことで、ノイズ除去を行ってもよい。 Further, the noise removing unit 80 subtracts the adjusted noise information signal s81 after adjusting at least one of the amplitude, phase and timing with respect to the second reception processing signal s2 including the noise information from the digital information signal s32. Then, noise may be removed.
　これによれば、ノイズ除去部８０にてノイズを確実に除去することができ、デジタル放送の受信特性が劣化することを抑制できる。 According to this, noise can be reliably removed by the noise removing unit 80, and deterioration of the reception characteristics of digital broadcasting can be suppressed.
　また、ノイズ除去部８０は、フィルタ係数を有するフィルタ部８１ａを有し、フィルタ部８１ａは、フィルタ係数に基づいて、ノイズ情報を含む第２受信処理信号ｓ２に対して振幅、位相およびタイミングの少なくとも１つを調整することで、調整後のノイズ情報信号ｓ８１を生成してもよい。 Further, the noise removing unit 80 has a filter unit 81a having a filter coefficient, and the filter unit 81a has at least an amplitude, a phase, and a timing with respect to the second reception processing signal s2 including noise information based on the filter coefficient. By adjusting one of them, the adjusted noise information signal s81 may be generated.
　これによれば、ノイズ除去を行うための調整後のノイズ情報信号ｓ８１を適切に生成することができる。これにより、デジタル放送の受信特性が劣化することを抑制できる。 According to this, the noise information signal s81 after adjustment for performing noise removal can be appropriately generated. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
　また、ノイズ除去部８０は、相関部８１ｂを有し、相関部８１ｂは、デジタル情報信号ｓ３２から調整後のノイズ情報信号ｓ８１を除去した後のノイズ除去信号ｓ８２とノイズ情報を含む第２受信処理信号ｓ２との相関をとり、上記相関に対応したフィルタ係数をフィルタ部８１ａへ出力してもよい。 Further, the noise removing unit 80 has a correlation unit 81b, and the correlation unit 81b is a second reception process including the noise removing signal s82 after removing the adjusted noise information signal s81 from the digital information signal s32 and the noise information. It may correlate with the signal s2 and output the filter coefficient corresponding to the correlation to the filter unit 81a.
　これによれば、ノイズ除去を行うために必要なフィルタ係数を適切に求めることができる。これにより、デジタル放送の受信特性が劣化することを抑制できる。 According to this, the filter coefficient required for noise removal can be appropriately obtained. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
　また、フィルタ係数は、適応フィルタを用いた演算によって求められてもよい。 Further, the filter coefficient may be obtained by an operation using an adaptive filter.
　これによれば、フィルタ係数を適切に求めることができる。これにより、デジタル放送の受信特性が劣化することを抑制できる。 According to this, the filter coefficient can be appropriately obtained. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
　また、適応フィルタは、ＭＭＳＥ（Ｍｉｎｉｍｕｍ　Ｍｅａｎ　Ｓｑｕａｒｅ　Ｅｒｒｏｒ）、ＬＭＳ（Ｌｅａｓｔ　Ｍｅａｎ　Ｓｑｕａｒｅ）、または、ＲＬＳ（Ｒｅｃｕｒｓｉｖｅ　Ｌｅａｓｔ　Ｓｑｕａｒｅ）であってもよい。 Further, the adaptive filter may be MMSE (Minimum Mean Square Error), LMS (Least Mean Square), or RLS (Recursive Last Square).
　これによれば、フィルタ係数を適切に求めることができる。これにより、デジタル放送の受信特性が劣化することを抑制できる。 According to this, the filter coefficient can be appropriately obtained. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
　また、第１受信部１１ａは、デジタル情報信号ｓ３２およびノイズ除去信号ｓ８２のうち信号の受信品質が高いほうを第１受信処理信号ｓａとして第１の合成部３３へ出力してもよい。 Further, the first receiving unit 11a may output the higher signal reception quality of the digital information signal s32 and the noise removing signal s82 to the first combining unit 33 as the first receiving processing signal sa.
　この構成によれば、ノイズ除去を行う必要のない状況、または、ノイズ除去を行うことで却って受信品質を悪くする状況においても、安定した受信品質を確保することができる。これにより、第１受信部１１ａにおけるデジタル放送の受信特性が劣化することを抑制できる。 According to this configuration, stable reception quality can be ensured even in a situation where it is not necessary to remove noise or in a situation where the reception quality is deteriorated by removing noise. As a result, it is possible to suppress deterioration of the reception characteristics of the digital broadcast in the first receiving unit 11a.
　また、ノイズ除去部８０は、間欠動作を行い、間欠動作のうちの作動期間にノイズ除去信号ｓ８２を出力し、間欠動作のうちの非作動期間にノイズ除去を行わずにデジタル情報信号ｓ３２を出力してもよい。 Further, the noise removing unit 80 performs an intermittent operation, outputs a noise removing signal s82 during the operating period of the intermittent operation, and outputs a digital information signal s32 without performing noise removing during the non-operating period of the intermittent operation. You may.
　これによれば、ノイズの発生しない期間に、ノイズ除去を行うことで却って受信品質を悪くすることを防止できる。これにより、デジタル放送の受信特性が劣化することを抑制できる。 According to this, it is possible to prevent the reception quality from being deteriorated by removing the noise during the period when the noise is not generated. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
　また、第１受信部１１ａは、第２受信部５０の作動を第１受信部１１ａの作動に同期させるための同期情報を第２受信部５０へ出力してもよい。 Further, the first receiving unit 11a may output synchronization information for synchronizing the operation of the second receiving unit 50 with the operation of the first receiving unit 11a to the second receiving unit 50.
　これによれば、第２受信部５０の作動を第１受信部１１ａの作動に同期させることができ、第２受信部５０は、適切なタイミングで第２受信処理信号ｓ２を第１受信部１１ａに出力することができる。これにより、第１受信部１１ａにおいて適切なタイミングで受信処理を行い、デジタル放送の受信特性が劣化することを抑制できる。 According to this, the operation of the second receiving unit 50 can be synchronized with the operation of the first receiving unit 11a, and the second receiving unit 50 sends the second reception processing signal s2 to the first receiving unit 11a at an appropriate timing. Can be output to. As a result, the first receiving unit 11a can perform reception processing at an appropriate timing and suppress deterioration of the reception characteristics of digital broadcasting.
　（実施の形態３）
　［３－１．デジタル放送受信装置の構成］
　実施の形態３に係るデジタル放送受信装置１Ｂについて説明する。実施の形態３に係るデジタル放送受信装置１Ｂは、実施の形態１と実施の形態２とが組み合わされた形態を有している。 (Embodiment 3)
[3-1. Configuration of digital broadcast receiver]
The digital broadcast receiving device 1B according to the third embodiment will be described. The digital broadcast receiving device 1B according to the third embodiment has a form in which the first embodiment and the second embodiment are combined.
　図１８は、実施の形態３に係るデジタル放送受信装置１Ｂの構成を示す図である。なお、図１８には、デジタル放送などの放送信号が入力される複数のアンテナ２ａ、２ｂ、２ｃ、２ｄ、および、映像・音声を出力する映像・音声出力部３ａ、３ｂも示されている。 FIG. 18 is a diagram showing the configuration of the digital broadcast receiving device 1B according to the third embodiment. Note that FIG. 18 also shows a plurality of antennas 2a, 2b, 2c, 2d for inputting broadcast signals such as digital broadcasting, and video / audio output units 3a, 3b for outputting video / audio.
　デジタル放送受信装置１Ｂは、ダイバーシティ受信部１０と、第２受信部５０と、チャネル情報取得部４０と、を備える。 The digital broadcast receiving device 1B includes a diversity receiving unit 10, a second receiving unit 50, and a channel information acquisition unit 40.
　ダイバーシティ受信部１０は、複数の第１受信部１１ａ、１１ｂ、１１ｃ、１１ｄ、第１の合成部３３、第２の合成部３４、第１の誤り訂正部３５、第２の誤り訂正部３６、および、切替部７５を備えている。また、ダイバーシティ受信部１０は、ＰＬＬＡ１２およびＰＬＬＢ１３を備えている。 The diversity receiving unit 10 includes a plurality of first receiving units 11a, 11b, 11c, 11d, a first synthesis unit 33, a second synthesis unit 34, a first error correction unit 35, and a second error correction unit 36. And a switching unit 75 is provided. Further, the diversity receiving unit 10 includes PLLA 12 and PLLB 13.
　複数の第１受信部１１ａ～１１ｄは、複数のアンテナ２ａ～２ｄから入力されたデジタル放送の放送信号を受信処理して複数の第１受信処理信号ｓａ、ｓｂ、ｓｃ、ｓｄを出力する。第１受信部１１ａ～１１ｄのそれぞれは、チューナ部２１、ＡＤ変換部３１および復調部３２を備えている。チューナ部２１は、第１の増幅部２２、ミキサ部２３、帯域フィルタ２４および第２の増幅部２５によって構成されている。 The plurality of first reception units 11a to 11d receive and process the broadcast signals of digital broadcasting input from the plurality of antennas 2a to 2d, and output the plurality of first reception processing signals sa, sb, sc, and sd. Each of the first receiving units 11a to 11d includes a tuner unit 21, an AD conversion unit 31, and a demodulation unit 32. The tuner section 21 is composed of a first amplification section 22, a mixer section 23, a band filter 24, and a second amplification section 25.
　ＡＤ変換部３１は、第２の増幅部２５で増幅されたアナログ信号をデジタル信号ｓ３１に変換して復調部３２へ出力する。各復調部３２は、デジタル信号ｓ３１を復調し、第１受信部１１ａ～１１ｄの出力信号を出力する。 The AD conversion unit 31 converts the analog signal amplified by the second amplification unit 25 into a digital signal s31 and outputs it to the demodulation unit 32. Each demodulation unit 32 demodulates the digital signal s31 and outputs the output signals of the first receiving units 11a to 11d.
　また、各第１受信部１１ａ～１１ｄの復調部３２は、ノイズ除去部８０を備えている。このデジタル放送受信装置１Ｂでは、第２受信部５０から出力された第２受信処理信号ｓ２を利用して、第１受信部１１ａ～１１ｄ内にて伝送される信号に対しノイズ除去を行う。ノイズ除去部８０は、復調部３２にて復調処理した後のデジタル情報信号ｓ３２に対してノイズ除去を行うことで、ノイズが除去された後のノイズ除去信号ｓ８２を第１受信処理信号ｓａ～ｓｄとして出力する。 Further, the demodulation unit 32 of each of the first reception units 11a to 11d includes a noise removal unit 80. The digital broadcast receiving device 1B uses the second reception processing signal s2 output from the second receiving unit 50 to remove noise from the signals transmitted in the first receiving units 11a to 11d. The noise removing unit 80 removes noise from the digital information signal s32 after the demodulation processing by the demodulation unit 32, so that the noise removing signal s82 after the noise is removed is the first reception processing signals sa to sd. Output as.
　ノイズ除去部８０は、デジタル放送のチャネル周波数をサーチするチャネルサーチ時にノイズ除去を行わず、チャネルサーチをせずにデジタル放送を受信する通常受信時にノイズ除去を行ってもよい。ノイズ除去部８０は、通常受信時に連続動作あるいは間欠動作して、ノイズ除去を行ってもよい。 The noise removing unit 80 may not perform noise removal at the time of channel search for searching the channel frequency of digital broadcasting, and may perform noise removal at the time of normal reception of receiving digital broadcasting without performing channel search. The noise removing unit 80 may perform continuous operation or intermittent operation at the time of normal reception to remove noise.
　第１の合成部３３は、複数の第１受信部１１ａ～１１ｄから出力された複数の第１受信処理信号ｓａ～ｓｄの少なくとも２つを合成して第１合成信号ｓ３３を生成する。第１の合成部３３は、第１合成信号ｓ３３を第１の誤り訂正部３５へ出力する。 The first synthesis unit 33 synthesizes at least two of the plurality of first reception processing signals sa to sd output from the plurality of first reception units 11a to 11d to generate the first composite signal s33. The first synthesis unit 33 outputs the first synthesis signal s33 to the first error correction unit 35.
　第１の誤り訂正部３５は、第１合成信号ｓ３３に対して第１の誤り訂正処理を行う。本実施の形態において、第１の誤り訂正部３５は、チャネルサーチ時および通常受信時のそれぞれの時に、第１合成信号ｓ３３に対して第１の誤り訂正処理を行い、誤り訂正処理後の信号を映像・音声出力部３ａおよびチャネル情報取得部４０へ出力する。 The first error correction unit 35 performs the first error correction process on the first composite signal s33. In the present embodiment, the first error correction unit 35 performs the first error correction processing on the first composite signal s33 at each time of the channel search and the normal reception, and the signal after the error correction processing. Is output to the video / audio output unit 3a and the channel information acquisition unit 40.
　第２の合成部３４は、複数の第１受信部１１ａ～１１ｄから出力された複数の第１受信処理信号ｓａ～ｓｄの少なくとも２つを合成して第２合成信号ｓ３４を生成する。第２の合成部３４は、切替部３７を介して、第２合成信号ｓ３４を第２の誤り訂正部３６へ出力する。 The second synthesis unit 34 synthesizes at least two of the plurality of first reception processing signals sa to sd output from the plurality of first reception units 11a to 11d to generate the second composite signal s34. The second synthesis unit 34 outputs the second synthesis signal s34 to the second error correction unit 36 via the switching unit 37.
　第２受信部５０は、チャネルサーチを行う機能および妨害波を受信処理する機能を有している。第２受信部５０は、デジタル放送の放送信号の受信品質が所定の受信品質値を下回ったときにチャネルサーチを行い、チャネル情報の取得を開始する。また、第２受信部５０は、妨害波によって入力された信号を受信処理し、ノイズ情報を含む第２受信処理信号ｓ２を第１受信部１１ａへ出力する。 The second receiving unit 50 has a function of performing a channel search and a function of receiving and processing an interfering wave. The second receiving unit 50 performs a channel search when the reception quality of the broadcast signal of the digital broadcast falls below a predetermined reception quality value, and starts acquiring channel information. Further, the second receiving unit 50 receives and processes the signal input by the interference wave, and outputs the second receiving processing signal s2 including the noise information to the first receiving unit 11a.
　第２受信部５０は、アンテナ２ｄおよび第１受信部１１ｄの間の分岐部ｎ１から分岐して入力されたデジタル放送の放送信号を受信処理し、または、アンテナ２ｊから入力された妨害波の信号を受信処理し、第２受信処理信号ｓ２を出力する。これら２つの信号の受信処理の切替は、切替部７５の作動によって実行される。 The second receiving unit 50 receives and processes the broadcast signal of the digital broadcast branched and input from the branching unit n1 between the antenna 2d and the first receiving unit 11d, or the signal of the interfering wave input from the antenna 2j. Is received and processed, and the second reception processing signal s2 is output. Switching of the reception processing of these two signals is executed by the operation of the switching unit 75.
　第２受信部５０は、切替部７５、チューナ部５１、ＡＤ変換部６１および復調部６２を備えている。 The second receiving unit 50 includes a switching unit 75, a tuner unit 51, an AD conversion unit 61, and a demodulation unit 62.
　切替部７５は、分岐部ｎ１およびアンテナ２ｊとチューナ部５１との間に設けられている。切替部７５は、第２受信部５０に放送信号を入力する場合にチューナ部５１が分岐部ｎ１を介してアンテナ２ｄに接続されるように作動し、第２受信部５０に妨害波を入力する場合にチューナ部５１がアンテナ２ｊに接続されるように作動する。 The switching portion 75 is provided between the branch portion n1 and the antenna 2j and the tuner portion 51. When a broadcast signal is input to the second receiving unit 50, the switching unit 75 operates so that the tuner unit 51 is connected to the antenna 2d via the branch unit n1 and inputs an interfering wave to the second receiving unit 50. In this case, the tuner portion 51 operates so as to be connected to the antenna 2j.
　チューナ部５１は、第１の増幅部５２、ミキサ部５３、帯域フィルタ５４および第２の増幅部５５によって構成されている。 The tuner section 51 is composed of a first amplification section 52, a mixer section 53, a band filter 54, and a second amplification section 55.
　ＡＤ変換部６１は、第２の増幅部５５で増幅されたアナログ信号をデジタル信号ｓ６１に変換して復調部６２へ出力する。復調部６２は、デジタル信号ｓ６１を復調し、第２受信部５０の出力信号である第２受信処理信号ｓ２を出力する。第２受信部５０は、切替部３７を介して、第２受信処理信号ｓ２を第２の誤り訂正部３６へ出力する。 The AD conversion unit 61 converts the analog signal amplified by the second amplification unit 55 into a digital signal s61 and outputs it to the demodulation unit 62. The demodulation unit 62 demodulates the digital signal s61 and outputs the second reception processing signal s2, which is the output signal of the second reception unit 50. The second reception unit 50 outputs the second reception processing signal s2 to the second error correction unit 36 via the switching unit 37.
　第２の誤り訂正部３６は、第２合成信号ｓ３４および第２受信処理信号ｓ２のそれぞれに対して第２の誤り訂正処理を行う。例えば、第２の誤り訂正部３６は、通常受信時に、切替部３７の作動によって第２の合成部３４に接続され、第２合成信号ｓ３４に対して第２の誤り訂正処理を行い、誤り訂正処理後の信号を映像・音声出力部３ｂへ出力する。また、第２の誤り訂正部３６は、チャネルサーチ時に、切替部３７の作動によって第２受信部５０に接続され、第２受信処理信号ｓ２に対して第２の誤り訂正処理を行い、誤り訂正処理後の信号をチャネル情報取得部４０へ出力する。 The second error correction unit 36 performs a second error correction process on each of the second composite signal s34 and the second reception processing signal s2. For example, the second error correction unit 36 is connected to the second synthesis unit 34 by the operation of the switching unit 37 at the time of normal reception, performs the second error correction processing on the second synthesis signal s34, and performs error correction. The processed signal is output to the video / audio output unit 3b. Further, the second error correction unit 36 is connected to the second reception unit 50 by the operation of the switching unit 37 at the time of channel search, performs the second error correction processing on the second reception processing signal s2, and performs error correction. The processed signal is output to the channel information acquisition unit 40.
　また、第２受信部５０は、チャネルサーチ時に複数のアンテナ２ａ～２ｄのうちの少なくとも１つのアンテナ（例えばアンテナ２ｄ）から入力されたデジタル放送の放送信号を受信処理して、第２受信処理信号ｓ２を第２の誤り訂正部３６へ出力する。一方、第２受信部５０は、通常受信時に、他のアンテナ２ｊから入力された信号を受信処理して、ノイズ情報を含む第２受信処理信号ｓ２をノイズ除去部８０へ出力する。なお、これらのアンテナ２ｄまたはアンテナ２ｊの入力の切り替えは、切替部７５の作動によって行われる。 Further, the second receiving unit 50 receives and processes the broadcast signal of the digital broadcast input from at least one antenna (for example, the antenna 2d) of the plurality of antennas 2a to 2d at the time of channel search, and receives the second reception processing signal. Output s2 to the second error correction unit 36. On the other hand, the second receiving unit 50 receives and processes the signal input from the other antenna 2j at the time of normal reception, and outputs the second reception processing signal s2 including the noise information to the noise removing unit 80. The input switching of the antenna 2d or the antenna 2j is performed by the operation of the switching unit 75.
　チャネル情報取得部４０は、第１の誤り訂正部３５および第２の誤り訂正部３６から出力された信号に基づいてチャネル情報を取得する。メインコントローラ４は、取得したチャネル情報に基づいて、第１受信部１１ａ～１１ｄで受信するチャネルを選局し、第１受信部１１ａ～１１ｄへ選局指示する。また、メインコントローラ４は、第２受信部５０でチャネルサーチを行う際のチャネルを順に変更するように、第２受信部５０へ選局指示する。 The channel information acquisition unit 40 acquires channel information based on the signals output from the first error correction unit 35 and the second error correction unit 36. The main controller 4 selects a channel to be received by the first receiving units 11a to 11d based on the acquired channel information, and instructs the first receiving units 11a to 11d to select the channel. In addition, the main controller 4 instructs the second receiving unit 50 to select channels so that the channels when the second receiving unit 50 performs the channel search are changed in order.
　本実施の形態のデジタル放送受信装置１Ｂは、第１受信部１１ａ～１１ｄとは異なる第２受信部５０を備えており、第２受信部５０を用いてチャネルサーチを行う。そのため、チャネルサーチを行うために第１受信部１１ａ～１１ｄを使う必要がなく、第１受信部１１ａ～１１ｄを元々の用途である視聴用の受信部として使うことができる。そのため、デジタル放送の受信特性が劣化することを抑制できる。 The digital broadcast receiving device 1B of the present embodiment includes a second receiving unit 50 different from the first receiving units 11a to 11d, and performs a channel search using the second receiving unit 50. Therefore, it is not necessary to use the first receiving units 11a to 11d to perform the channel search, and the first receiving units 11a to 11d can be used as the receiving unit for viewing, which is the original purpose. Therefore, it is possible to suppress deterioration of the reception characteristics of digital broadcasting.
　また、デジタル放送受信装置１Ｂでは、第２受信部５０から出力された第２受信処理信号ｓ２を利用し、第１受信部１１ａ内にて伝送される信号に対しノイズ除去を行う。これにより、デジタル放送の受信特性が劣化することを抑制できる。 Further, the digital broadcast receiving device 1B uses the second reception processing signal s2 output from the second receiving unit 50 to remove noise from the signal transmitted in the first receiving unit 11a. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
　例えば、第２受信部をチャネルサーチ用の受信部として作動させる場合、切替部７５の作動によりアンテナ２ｄからの信号が入力され、復調した信号を第２の誤り訂正部で誤り訂正処理し、チャネル情報を取得する。また、第２受信部５０をノイズ除去用の受信部として作動させる場合、切替部７５の作動によりアンテナ２ｊからの信号が入力され、第２受信部５０で処理された信号に基づいて、第１受信部１１ａ～１１ｄの各復調部３２にてノイズを除去する。さらには、チャネルサーチをせずノイズ除去もしない場合には、第２受信部５０が第１受信部１１ａ～１１ｄと同一チャネルを受信している場合に限り、第２受信部５０内の中間信号ｓ５０を第１受信部（例えば１１ｄ）へ出力し、合成もしくは補正することで特性劣化を補償する。 For example, when the second receiving unit is operated as a receiving unit for channel search, a signal from the antenna 2d is input by the operation of the switching unit 75, the demodulated signal is error-corrected by the second error-correcting unit, and the channel is processed. Get information. Further, when the second receiving unit 50 is operated as a receiving unit for noise removal, a signal from the antenna 2j is input by the operation of the switching unit 75, and based on the signal processed by the second receiving unit 50, the first unit is used. Noise is removed by each demodulation unit 32 of the reception units 11a to 11d. Further, when the channel search is not performed and the noise is not removed, the intermediate signal in the second receiving unit 50 is limited to the case where the second receiving unit 50 is receiving the same channel as the first receiving units 11a to 11d. The s50 is output to the first receiving unit (for example, 11d), and the deterioration of the characteristics is compensated by combining or correcting.
　第２受信部５０を、ノイズ除去用として作動させるか、チャネルサーチ用として作動させるかは、ダイバーシティ受信部１０における信号の受信品質によって決定してもよい。例えば、受信品質として所定の受信品質値を設け、受信品質が所定の受信品質値の範囲内にある場合はノイズ除去用として作動させ、所定の受信品質値の範囲外であって所定の受信品質値よりも小さい場合は、チャネルサーチ用として作動させてもよい。 Whether the second receiving unit 50 is operated for noise removal or for channel search may be determined by the reception quality of the signal in the diversity receiving unit 10. For example, a predetermined reception quality value is set as the reception quality, and when the reception quality is within the range of the predetermined reception quality value, it is operated for noise removal, and the reception quality is outside the range of the predetermined reception quality value and is within the predetermined reception quality. If it is less than the value, it may be operated for channel search.
　また、ダイバーシティ受信部１０および第２受信部５０は、１つのＬＳＩチップで構成されていてもよい。また、ＡＤ変換部３１、復調部３２、第１の合成部３３、第２の合成部３４、第１の誤り訂正部３５および第２の誤り訂正部３６と、ＡＤ変換部６１および復調部６２とが、１つのＬＳＩチップで構成されてもよい。また、チューナ部２１、ＰＬＬＡ１２およびＰＬＬＢ１３と、チューナ部５１とが、１つのＬＳＩチップで構成されてもよい。また、チューナ部２１、ＰＬＬＡ１２およびＰＬＬＢ１３が１つのＬＳＩチップで構成され、チューナ部５１が１つのＬＳＩチップで構成され、上記のＬＳＩチップのうち少なくとも２つがパッケージ化されていてもよい。チャネル情報取得部４０は、上記のＬＳＩチップのいずれかに設けられていてもよい。 Further, the diversity receiving unit 10 and the second receiving unit 50 may be composed of one LSI chip. Further, the AD conversion unit 31, the demodulation unit 32, the first synthesis unit 33, the second synthesis unit 34, the first error correction unit 35 and the second error correction unit 36, and the AD conversion unit 61 and the demodulation unit 62. And may be composed of one LSI chip. Further, the tuner unit 21, PLLA 12 and PLLB 13, and the tuner unit 51 may be configured by one LSI chip. Further, the tuner unit 21, PLLA 12 and PLLB 13 may be composed of one LSI chip, the tuner unit 51 may be composed of one LSI chip, and at least two of the above LSI chips may be packaged. The channel information acquisition unit 40 may be provided on any of the above LSI chips.
　［３－２．アンテナの配置］
　次に、デジタル放送受信装置１Ｂに接続される複数のアンテナの配置について説明する。 [3-2. Antenna placement]
Next, the arrangement of a plurality of antennas connected to the digital broadcast receiving device 1B will be described.
　図１９は、デジタル放送受信装置１Ｂに接続されるアンテナの配置の一例を示す図である。図１９の（ａ）および（ｂ）は、アンテナ配置の異なる一例である。 FIG. 19 is a diagram showing an example of an arrangement of antennas connected to the digital broadcast receiving device 1B. 19 (a) and 19 (b) are examples of different antenna arrangements.
　図１９の（ａ）および（ｂ）には、車両である移動体５に、デジタル放送を受信する４つのアンテナ２ａ～２ｄと、妨害波を受信するアンテナ２ｊとが配置されている状態が示されている。妨害波を受信するアンテナ２ｊは、ノイズのレベルが所定の値よりも大きくなるように設置されている。このとき注意すべきは、たくさん存在する妨害波の中で、アンテナ２ｊは、アンテナ２ａ～２ｄに届く妨害波を受信する必要があり、それ以外のノイズを多く受信してはいけないということである。 19 (a) and 19 (b) show a state in which four antennas 2a to 2d for receiving digital broadcasting and antennas 2j for receiving interference waves are arranged on the moving body 5 which is a vehicle. Has been done. The antenna 2j that receives the jamming wave is installed so that the noise level becomes larger than a predetermined value. At this time, it should be noted that the antenna 2j needs to receive the interference wave reaching the antennas 2a to 2d among the many interference waves existing, and must not receive a lot of other noise. ..
　例えば、ノイズのレベルを所定の値より大きくするには、地上波デジタル放送の信号とノイズとの電力比（Ｄ／Ｕ）が、Ｄ／Ｕ＜０（ｄＢ）となるように、アンテナ２ｊを設置する、または、アンテナ２ｊが、アンテナ２ａ～２ｄのＤ／Ｕ値よりも下回るＤ／Ｕ値となるように設置する。 For example, in order to make the noise level higher than a predetermined value, the antenna 2j is set so that the power ratio (D / U) between the terrestrial digital broadcasting signal and the noise is D / U <0 (dB). It is installed, or the antenna 2j is installed so that the D / U value is lower than the D / U value of the antennas 2a to 2d.
　例えば、アンテナ２ａ～２ｄに届く妨害波を受信するアンテナ２ｊはノイズ源（図１９に示す破線）の近くで、かつ、アンテナ２ａ～２ｄの近くに配置する。具体的には、アンテナ２ｊを、アンテナ２ａ～２ｄのうちノイズ源に近いアンテナ群（フロントアンテナ群またはリアアンテナ群）と、ノイズ源との中間地点付近に配置する。図１９の（ａ）に示す例では、ノイズ源はボンネット付近にあり、アンテナ２ａ～２ｄのうちアンテナ２ａ、２ｂが、アンテナ２ｃ、２ｄよりも強く影響を受ける。この場合、アンテナ２ｊをダッシュボード付近に設置する。また、図１９の（ｂ）に示す例では、ノイズ源は車体中央付近にあり、アンテナ２ａ～２ｄのうちアンテナ２ｃ、２ｄが、アンテナ２ａ、２ｄより強く影響を受ける。この場合、アンテナ２ｊを後部座席付近に設置する。 For example, the antenna 2j that receives the interference wave reaching the antennas 2a to 2d is arranged near the noise source (broken line shown in FIG. 19) and near the antennas 2a to 2d. Specifically, the antenna 2j is arranged near an intermediate point between the antenna group (front antenna group or rear antenna group) of the antennas 2a to 2d that is close to the noise source and the noise source. In the example shown in FIG. 19A, the noise source is near the bonnet, and the antennas 2a and 2b of the antennas 2a to 2d are more strongly affected than the antennas 2c and 2d. In this case, the antenna 2j is installed near the dashboard. Further, in the example shown in FIG. 19B, the noise source is located near the center of the vehicle body, and the antennas 2c and 2d of the antennas 2a to 2d are more strongly affected than the antennas 2a and 2d. In this case, the antenna 2j is installed near the rear seat.
　ここでノイズ源とは、デジタル放送受信装置１Ｂ本体や、ラジオ機器、ＩＴＳ、ＬＴＥ、ＥＴＣ、ＡＤＡＳ、Ｖ２Ｘなどの通信機器や、ドライブレコーダーまたはＡＤＡＳなどの録画・カメラ機器や、ＨＩＤヘッドライト、ドアミラー、ワイパーなどのモーターや、電源ライン、電気自動車などのバッテリーや、その他機器のバッテリーなどである。 Here, the noise source is a digital broadcast receiving device 1B main body, a radio device, a communication device such as ITS, LTE, ETC, ADAS, V2X, a recording / camera device such as a drive recorder or ADAS, a HID headlight, a door mirror. , Motors such as wipers, power lines, batteries for electric vehicles, and batteries for other equipment.
　なお、図１９に示すアンテナ配置は一例であり、４つのアンテナ２ａ～２ｄをすべてフロントアンテナに配置してもよい。ノイズを正しく検知させるためアンテナ２ｊに接続されるチューナ部５１は、アンテナ２ａ～２ｄで受信するチャネルと同じチャネルを選局してもよいし、異なるチャネルを選局してもよい。 Note that the antenna arrangement shown in FIG. 19 is an example, and all four antennas 2a to 2d may be arranged on the front antenna. The tuner section 51 connected to the antenna 2j in order to correctly detect noise may select the same channel as the channel received by the antennas 2a to 2d, or may select a different channel.
　［３－３．効果等］
　本実施の形態のデジタル放送受信装置１Ｂは、複数のアンテナ２ａ～２ｄから入力されたデジタル放送の放送信号を受信処理して複数の第１受信処理信号ｓａ～ｓｄを出力する複数の第１受信部１１ａ～１１ｄと、複数の第１受信処理信号ｓａ～ｓｄの少なくとも２つを合成して第１合成信号ｓ３３を出力する第１の合成部３３と、第１合成信号ｓ３３に対して第１の誤り訂正処理を行う第１の誤り訂正部３５と、入力された信号を受信処理して第２受信処理信号ｓ２を出力する第２受信部５０と、第２受信処理信号ｓ２に対してまたは第２受信処理信号ｓ２に基づいて処理された処理信号に対して第２の誤り訂正処理を行う第２の誤り訂正部３６と、を備える。 [3-3. Effect, etc.]
The digital broadcast receiving device 1B of the present embodiment receives and processes digital broadcast broadcast signals input from a plurality of antennas 2a to 2d and outputs a plurality of first reception processed signals sa to sd. Units 11a to 11d, the first synthesis unit 33 that synthesizes at least two of the plurality of first reception processing signals sa to sd and outputs the first synthesis signal s33, and the first synthesis signal s33. With respect to the first error correction unit 35 that performs the error correction processing of the above, the second reception unit 50 that receives and processes the input signal and outputs the second reception processing signal s2, and the second reception processing signal s2. A second error correction unit 36 that performs a second error correction process on the processed signal processed based on the second reception processing signal s2 is provided.
　また、デジタル放送受信装置１Ｂは、アンテナ２ａ～２ｄとは異なるアンテナ２ｊから入力された信号を受信処理して第２受信処理信号ｓ２を第１受信部１１ａへ出力する第２受信部５０と、を備える。第１受信部１１ａは、アンテナ２ａから入力された放送信号および第２受信部５０から出力された第２受信処理信号ｓ２に基づいて受信処理を行い、この受信処理後の処理信号を第１受信処理信号ｓａとして出力する。 Further, the digital broadcast receiving device 1B has a second receiving unit 50 that receives and processes a signal input from an antenna 2j different from the antennas 2a to 2d and outputs a second receiving processing signal s2 to the first receiving unit 11a. To be equipped. The first receiving unit 11a performs reception processing based on the broadcast signal input from the antenna 2a and the second reception processing signal s2 output from the second receiving unit 50, and first receives the processed signal after the reception processing. Output as a processing signal sa.
　このように、デジタル放送受信装置１が、第１受信部１１ａ～１１ｄとは異なる第２受信部５０を備えることで、第２受信部５０を用いてチャネルサーチを行うことができる。そのため、チャネルサーチを行う際に第１受信部１１ａ～１１ｄを使う必要がなく、第１受信部１１ａ～１１ｄを元々の用途である視聴用の受信部として使うことができる。これにより、チャネルサーチを行う際に、デジタル放送の受信特性が劣化することを抑制できる。 As described above, since the digital broadcast receiving device 1 includes the second receiving unit 50 different from the first receiving units 11a to 11d, the channel search can be performed using the second receiving unit 50. Therefore, it is not necessary to use the first receiving units 11a to 11d when performing the channel search, and the first receiving units 11a to 11d can be used as the receiving unit for viewing, which is the original purpose. As a result, it is possible to suppress deterioration of the reception characteristics of digital broadcasting when performing a channel search.
　また、このように、第２受信部５０から出力された第２受信処理信号ｓ２を利用し、第１受信部１１ａ～１１ｄ内にて伝送される信号に対しノイズ除去を行うことで、第１受信部１１ａ～１１ｄにおけるデジタル放送の受信特性が劣化することを抑制できる。 Further, in this way, by using the second reception processing signal s2 output from the second reception unit 50 and performing noise removal on the signals transmitted in the first reception units 11a to 11d, the first It is possible to suppress deterioration of the reception characteristics of digital broadcasting in the receiving units 11a to 11d.
　また、ノイズ除去部８０は、デジタル放送のチャネル周波数をサーチするチャネルサーチ時にノイズ除去を行わず、チャネルサーチをせずにデジタル放送を受信する通常受信時にノイズ除去を行ってもよい。 Further, the noise removing unit 80 may not perform noise removal at the time of channel search for searching the channel frequency of digital broadcasting, and may perform noise removal at the time of normal reception of receiving digital broadcasting without performing channel search.
　これによれば、ノイズ除去を行う必要がある通常受信時において、確実にノイズ除去を行うことができる。これにより、デジタル放送の受信特性が劣化することを抑制できる。 According to this, it is possible to reliably remove noise at the time of normal reception when it is necessary to remove noise. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
　また、第２受信部５０は、チャネルサーチ時に複数のアンテナ２ａ～２ｄのうちの少なくとも１つのアンテナから入力されたデジタル放送の放送信号を受信処理して、第２受信処理信号ｓ２を第２の誤り訂正部３６へ出力し、通常受信時に他のアンテナ２ｊから入力された信号を受信処理して、ノイズ情報を含む第２受信処理信号ｓ２をノイズ除去部８０へ出力してもよい。 Further, the second receiving unit 50 receives and processes the broadcast signal of the digital broadcast input from at least one of the plurality of antennas 2a to 2d at the time of channel search, and receives the second reception processing signal s2 as the second. The signal may be output to the error correction unit 36, the signal input from the other antenna 2j at the time of normal reception may be received and processed, and the second reception processing signal s2 including the noise information may be output to the noise removal unit 80.
　これによれば、第２受信部５０から出力された第２受信処理信号ｓ２を、チャネルサーチのために利用したり、ノイズ除去のために利用したりすることができる。これにより、デジタル放送の受信特性が劣化することを抑制できる。 According to this, the second reception processing signal s2 output from the second reception unit 50 can be used for channel search or for noise removal. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
　また、ノイズ除去部８０は、通常受信時に連続動作あるいは間欠動作して、ノイズ除去を行ってもよい。 Further, the noise removing unit 80 may perform continuous operation or intermittent operation at the time of normal reception to remove noise.
　これによれば、ノイズの発生しない期間に、ノイズ除去を行うことで却って受信品質を悪くすることを防止できる。これにより、デジタル放送の受信特性が劣化することを抑制できる。 According to this, it is possible to prevent the reception quality from being deteriorated by removing the noise during the period when the noise is not generated. As a result, deterioration of the reception characteristics of digital broadcasting can be suppressed.
　また、他のアンテナ２ｊは、複数のアンテナ２ａ～２ｄのうちノイズ源に最も近い１以上のアンテナと、ノイズ源との略中間に配置されてもよい。 Further, the other antenna 2j may be arranged substantially in the middle between one or more antennas of the plurality of antennas 2a to 2d closest to the noise source and the noise source.
　この構成によれば、複数のアンテナ２ａ～２ｄのうちノイズ源に最も近いアンテナに入力されるノイズを、アンテナ２ｊを用いて第２受信部５０に入力することができる。これにより、第２受信部５０のノイズ情報を含む出力信号を利用して、第１受信部１１ａ～１１ｄ内にて伝送される信号に対しノイズ除去を行うことができる。これにより、第１受信部１１ａ～１１ｄにおけるデジタル放送の受信特性が劣化することを抑制できる。 According to this configuration, the noise input to the antenna closest to the noise source among the plurality of antennas 2a to 2d can be input to the second receiving unit 50 using the antenna 2j. As a result, noise can be removed from the signals transmitted in the first receiving units 11a to 11d by using the output signal including the noise information of the second receiving unit 50. As a result, deterioration of the reception characteristics of digital broadcasting in the first receiving units 11a to 11d can be suppressed.
　（その他の実施の形態）
　以上、本開示の態様に係るデジタル放送受信装置について、実施の形態等に基づいて説明したが、本開示は、この実施の形態に限定されるものではない。例えば、本明細書において記載した構成要素を任意に組み合わせて、また、構成要素のいくつかを除外して実現される別の実施の形態を本開示の実施の形態としてもよい。また、上記実施の形態に対して本開示の主旨、すなわち、請求の範囲に記載される文言が示す意味を逸脱しない範囲で当業者が思いつく各種変形を施して得られる変形例も本開示に含まれる。 (Other embodiments)
The digital broadcast receiving device according to the embodiment of the present disclosure has been described above based on the embodiment and the like, but the present disclosure is not limited to this embodiment. For example, another embodiment realized by arbitrarily combining the components described in the present specification and excluding some of the components may be the embodiment of the present disclosure. The present disclosure also includes modifications obtained by making various modifications that can be conceived by those skilled in the art without departing from the gist of the present disclosure, that is, the meaning indicated by the wording described in the claims. Is done.
　例えば、実施の形態では、第１受信処理信号ｓａ～ｓｄが同じチャネル周波数の信号に基づく信号である例を示したが、異なるチャネル周波数の信号に基づく信号であってもよい。例えば、第１受信処理信号ｓａ、ｓｂと、第１受信処理信号ｓｃ、ｓｄとが異なるチャネル周波数の信号に基づく信号であり、映像・音声出力部３ａから出力される映像・音声と、映像・音声出力部３ｂから出力される映像・音声とが異なっていてもよい。 For example, in the embodiment, the first reception processing signals sa to sd are signals based on signals having the same channel frequency, but signals based on signals having different channel frequencies may be used. For example, the first reception processing signals sa and sb and the first reception processing signals sc and sd are signals based on signals having different channel frequencies, and the video / audio output from the video / audio output unit 3a and the video / audio The video / audio output from the audio output unit 3b may be different.
　実施の形態では、地上波デジタル放送に対し説明を行ったが、本実施の形態のデジタル放送受信装置は、国内のＩＳＤＢ-Ｔに関わらず、ＤＶＢ－ＴやＤＶＢ－Ｔ２、ＤＴＭＢ、ＡＴＳＣ１．０、ＡＴＳＣ３．０等にも利用できる。 In the embodiment, the terrestrial digital broadcasting has been described, but the digital broadcasting receiving device of the present embodiment is DVB-T, DVB-T2, DTMB, ATSC1.0 regardless of ISDB-T in Japan. , ATSC3.0, etc.
　また、本実施の形態のデジタル放送受信装置は、地上波デジタル放送に関わらず、ＩＳＤＢ－ＴｍｍやＩＳＤＢ－Ｔｓｂなどにも利用でき、さらには、ケーブルや衛星の各方式に利用してもよく、デジタル放送に限らず、通信やラジオなどにも利用できる。 Further, the digital broadcast receiving device of the present embodiment can be used for ISDB-Tmm, ISDB-Tsb, etc., regardless of terrestrial digital broadcasting, and may be used for each method of cable or satellite. It can be used not only for digital broadcasting but also for communication and radio.
　実施の形態では、チューナ部２１が、第１の増幅部、ミキサ部、帯域フィルタおよび第２の増幅部で構成されている例を示したが、チューナ部の構成はこれに限られない。チューナ部は、所望のチャネル周波数を中間周波数やベースバンドに変換する他の回路装置を備えていてもよい。 In the embodiment, an example is shown in which the tuner unit 21 is composed of a first amplification unit, a mixer unit, a band filter, and a second amplification unit, but the configuration of the tuner unit is not limited to this. The tuner unit may include other circuit devices that convert the desired channel frequency into an intermediate frequency or baseband.
　また、以下に示す形態も、本開示の一つまたは複数の態様の範囲内に含まれてもよい。 The forms shown below may also be included within the scope of one or more aspects of the present disclosure.
　（１）上記のデジタル放送受信装置を構成する構成要素の一部は、マイクロプロセッサ、ＲＯＭ、ＲＡＭ、ハードディスクユニット、ディスプレイユニット、キーボード、マウスなどから構成されるコンピュータシステムであってもよい。前記ＲＡＭまたはハードディスクユニットには、コンピュータプログラムが記憶されている。前記マイクロプロセッサが、前記コンピュータプログラムにしたがって動作することにより、その機能を達成する。ここでコンピュータプログラムは、所定の機能を達成するために、コンピュータに対する指令を示す命令コードが複数個組み合わされて構成されたものである。 (1) A part of the components constituting the above digital broadcast receiving device may be a computer system composed of a microprocessor, ROM, RAM, hard disk unit, display unit, keyboard, mouse and the like. A computer program is stored in the RAM or the hard disk unit. The microprocessor achieves its function by operating according to the computer program. Here, a computer program is configured by combining a plurality of instruction codes indicating commands to a computer in order to achieve a predetermined function.
　（２）上記のデジタル放送受信装置を構成する構成要素の一部は、１個のシステムＬＳＩ（Ｌａｒｇｅ　Ｓｃａｌｅ　Ｉｎｔｅｇｒａｔｉｏｎ：大規模集積回路）から構成されているとしてもよい。システムＬＳＩは、複数の構成部を１個のチップ上に集積して製造された超多機能ＬＳＩであり、具体的には、マイクロプロセッサ、ＲＯＭ、ＲＡＭなどを含んで構成されるコンピュータシステムである。前記ＲＡＭには、コンピュータプログラムが記憶されている。前記マイクロプロセッサが、前記コンピュータプログラムにしたがって動作することにより、システムＬＳＩは、その機能を達成する。 (2) A part of the components constituting the above digital broadcast receiving device may be composed of one system LSI (Large Scale Integration: large-scale integrated circuit). A system LSI is an ultra-multifunctional LSI manufactured by integrating a plurality of components on a single chip, and specifically, is a computer system including a microprocessor, ROM, RAM, and the like. .. A computer program is stored in the RAM. When the microprocessor operates according to the computer program, the system LSI achieves its function.
　（３）上記のデジタル放送受信装置を構成する構成要素の一部は、各装置に脱着可能なＩＣカードまたは単体のモジュールから構成されているとしてもよい。前記ＩＣカードまたは前記モジュールは、マイクロプロセッサ、ＲＯＭ、ＲＡＭなどから構成されるコンピュータシステムである。前記ＩＣカードまたは前記モジュールは、上記の超多機能ＬＳＩを含むとしてもよい。マイクロプロセッサが、コンピュータプログラムにしたがって動作することにより、前記ＩＣカードまたは前記モジュールは、その機能を達成する。このＩＣカードまたはこのモジュールは、耐タンパ性を有するとしてもよい。 (3) Some of the components constituting the above digital broadcast receiving device may be composed of an IC card or a single module that can be attached to and detached from each device. The IC card or the module is a computer system composed of a microprocessor, a ROM, a RAM, and the like. The IC card or the module may include the above-mentioned super multifunctional LSI. When the microprocessor operates according to a computer program, the IC card or the module achieves its function. This IC card or this module may have tamper resistance.
　（４）また、上記のデジタル放送受信装置を構成する構成要素の一部は、前記コンピュータプログラムまたは前記デジタル信号をコンピュータで読み取り可能な記録媒体、例えば、フレキシブルディスク、ハードディスク、ＣＤ－ＲＯＭ、ＭＯ、ＤＶＤ、ＤＶＤ－ＲＯＭ、ＤＶＤ－ＲＡＭ、ＢＤ（Ｂｌｕ－ｒａｙ（登録商標）　Ｄｉｓｃ）、半導体メモリなどに記録したものとしてもよい。また、これらの記録媒体に記録されている前記デジタル信号であるとしてもよい。 (4) Further, some of the components constituting the digital broadcast receiving device include the computer program or a recording medium capable of reading the digital signal by a computer, for example, a flexible disk, a hard disk, a CD-ROM, an MO, and the like. It may be recorded on a DVD, DVD-ROM, DVD-RAM, BD (Blu-ray (registered trademark) Disc), semiconductor memory, or the like. Further, it may be the digital signal recorded on these recording media.
　また、上記のデジタル放送受信装置を構成する構成要素の一部は、前記コンピュータプログラムまたは前記デジタル信号を、電気通信回線、無線または有線通信回線、インターネットを代表とするネットワーク、データ放送等を経由して伝送するものとしてもよい。 In addition, some of the components constituting the digital broadcast receiving device transmit the computer program or the digital signal via a telecommunication line, a wireless or wired communication line, a network represented by the Internet, data broadcasting, or the like. May be transmitted.
　（５）本開示は、上記に示す方法であるとしてもよい。また、これらの方法をコンピュータにより実現するコンピュータプログラムであるとしてもよいし、前記コンピュータプログラムからなるデジタル信号であるとしてもよい。 (5) The present disclosure may be the method shown above. Further, it may be a computer program that realizes these methods by a computer, or it may be a digital signal composed of the computer program.
　（６）また、本開示は、マイクロプロセッサとメモリを備えたコンピュータシステムであって、前記メモリは、上記コンピュータプログラムを記憶しており、前記マイクロプロセッサは、前記コンピュータプログラムにしたがって動作するとしてもよい。 (6) Further, the present disclosure is a computer system including a microprocessor and a memory, in which the memory stores the computer program, and the microprocessor may operate according to the computer program. ..
　（７）また、前記プログラムまたは前記デジタル信号を前記記録媒体に記録して移送することにより、または前記プログラムまたは前記デジタル信号を、前記ネットワーク等を経由して移送することにより、独立した他のコンピュータシステムにより実施するとしてもよい。 (7) Further, another independent computer by recording the program or the digital signal on the recording medium and transferring the program or the digital signal, or by transferring the program or the digital signal via the network or the like. It may be implemented by the system.
　（８）上記実施の形態及び上記変形例をそれぞれ組み合わせてもよい。 (8) The above-described embodiment and the above-mentioned modification may be combined.
　本開示のデジタル放送受信装置は、車両などの移動体に搭載される放送受信装置などに利用できる。 The digital broadcast receiving device of the present disclosure can be used as a broadcasting receiving device mounted on a moving body such as a vehicle.
１、１Ａ、１Ｂ　デジタル放送受信装置
２ａ、２ｂ、２ｃ、２ｄ、２ｅ、２ｈ、２ｊ　アンテナ
３ａ、３ｂ　映像・音声出力部
４　　メインコントローラ
５　　移動体
６ａ、６ｂ中継局
１０　ダイバーシティ受信部
１１ａ、１１ｂ、１１ｃ、１１ｄ　第１受信部
１２　ＰＬＬＡ
１３　ＰＬＬＢ
２１、５１　チューナ部
２２、５２　第１の増幅部
２３、５３　ミキサ部
２４、５４　帯域フィルタ
２５、５５　第２の増幅部
３１、６１　ＡＤ変換部
３２、６２　復調部
３３　第１の合成部
３４　第２の合成部
３５　第１の誤り訂正部
３６　第２の誤り訂正部
３７　切替部
４０　チャネル情報取得部
５０　第２受信部
７１　第３の増幅部
７２、７５　切替部
８０　ノイズ除去部
８１　信号調整部
８１ａ　フィルタ部
８１ｂ　相関部
８２　加減算部
９０　信号選択部
９１ａ、９１ｂ　受信品質判定部
９２　比較部
９３　切替部
ＣＰ１　ＬＳＩチップ
ｎ１　　分岐部
ｓａ、ｓｂ、ｓｃ、ｓｄ　第１受信処理信号
ｓ２　　第２受信処理信号
ｓ２２、ｓ５２　増幅信号
ｓ３１、ｓ６１　デジタル信号
ｓ３２　デジタル情報信号
ｓ３３　第１合成信号
ｓ３４　第２合成信号
ｓ５０　中間信号
ｓ８１　調整後のノイズ情報信号
ｓ８２　ノイズ除去信号 1,1A, 1B Digital broadcast receiver 2a, 2b, 2c, 2d, 2e, 2h, 2j Antenna 3a, 3b Video / audio output unit 4 Main controller 5 Mobile 6a, 6b Relay station 10 Diversity receiver 11a, 11b 11c, 11d 1st receiver 12 PLLA
13 PLLB
21, 51 Tuner section 22, 52 First amplification section 23, 53 Mixer section 24, 54 Band filter 25, 55 Second amplification section 31, 61 AD conversion section 32, 62 Demodition section 33 First synthesis section 34 First 2 synthesis unit 35 1st error correction unit 36 2nd error correction unit 37 Switching unit 40 Channel information acquisition unit 50 2nd receiving unit 71 3rd amplification unit 72, 75 Switching unit 80 Noise removing unit 81 Signal adjustment unit 81a Filter unit 81b Correlation unit 82 Addition / subtraction unit 90 Signal selection unit 91a, 91b Reception quality determination unit 92 Comparison unit 93 Switching unit CP1 LSI chip n1 Branch unit sa, sb, sc, sd First reception processing signal s2 Second reception processing signal s22, s52 Amplified signal s31, s61 Digital signal s32 Digital information signal s33 First composite signal s34 Second composite signal s50 Intermediate signal s81 Adjusted noise information signal s82 Noise removal signal

Claims (29)

  1. 　複数のアンテナから入力されたデジタル放送の放送信号を受信処理して複数の第１受信処理信号を出力する複数の第１受信部と、
    　前記複数の第１受信処理信号の少なくとも２つを合成して第１合成信号を出力する第１の合成部と、
    　前記第１合成信号に対して第１の誤り訂正処理を行う第１の誤り訂正部と、
    　入力された信号を受信処理して第２受信処理信号を出力する第２受信部と、
    　前記第２受信処理信号に対してまたは前記第２受信処理信号に基づいて処理された処理信号に対して第２の誤り訂正処理を行う第２の誤り訂正部と、
    　を備えるデジタル放送受信装置。     A plurality of first receivers that receive and process digital broadcast signals input from a plurality of antennas and output a plurality of first reception processing signals.
    A first compositing unit that synthesizes at least two of the plurality of first reception processing signals and outputs the first synthesized signal,
    A first error correction unit that performs a first error correction process on the first composite signal, and
    A second receiver that receives and processes the input signal and outputs the second reception processing signal,
    A second error correction unit that performs a second error correction process on the second reception processing signal or a processing signal processed based on the second reception processing signal.
    A digital broadcast receiver equipped with.
  2. 　前記第２受信部は、前記放送信号を前記入力された信号とし、当該入力された信号に対しチャネルサーチを行い、前記第２受信処理信号を出力する、
    　請求項１に記載のデジタル放送受信装置。     The second receiving unit uses the broadcast signal as the input signal, performs a channel search on the input signal, and outputs the second reception processing signal.
    The digital broadcast receiving device according to claim 1.
  3. 　さらに、前記第２の誤り訂正部から出力された信号に基づいて前記デジタル放送のチャネル情報を取得するチャネル情報取得部を備える、
    　請求項２に記載のデジタル放送受信装置。     Further, it includes a channel information acquisition unit that acquires channel information of the digital broadcast based on the signal output from the second error correction unit.
    The digital broadcast receiving device according to claim 2.
  4. 　前記第２受信部は、前記複数のアンテナのうちの少なくとも１つのアンテナから入力された前記放送信号を前記入力された信号とし、受信処理する、
    　請求項１～３のいずれか１項に記載のデジタル放送受信装置。     The second receiving unit uses the broadcast signal input from at least one of the plurality of antennas as the input signal and performs reception processing.
    The digital broadcast receiving device according to any one of claims 1 to 3.
  5. 　前記第２受信部は、前記複数のアンテナとは異なる他のアンテナから入力された前記放送信号を前記入力された信号とし、受信処理する、
    　請求項１～３のいずれか１項に記載のデジタル放送受信装置。     The second receiving unit uses the broadcast signal input from another antenna different from the plurality of antennas as the input signal and performs reception processing.
    The digital broadcast receiving device according to any one of claims 1 to 3.
  6. 　前記第１の誤り訂正部は、前記デジタル放送のチャネル周波数をサーチするチャネルサーチ時および前記チャネルサーチをせずに前記デジタル放送を受信する通常受信時のそれぞれの時に、前記第１の誤り訂正処理を行い、
    　前記第２の誤り訂正部は、前記チャネルサーチ時に前記第２の誤り訂正処理を行い、前記通常受信時に前記第２の誤り訂正処理を行わない、
    　請求項１～５のいずれか１項に記載のデジタル放送受信装置。     The first error correction unit performs the first error correction process at the time of channel search for searching the channel frequency of the digital broadcast and at the time of normal reception of receiving the digital broadcast without performing the channel search. And
    The second error correction unit performs the second error correction process at the time of the channel search, and does not perform the second error correction process at the time of the normal reception.
    The digital broadcast receiving device according to any one of claims 1 to 5.
  7. 　さらに、前記複数の第１受信部から出力された前記複数の第１受信処理信号の少なくとも２つを合成して第２合成信号を出力する第２の合成部を備え、
    　前記第２の合成部は、前記第２合成信号を前記第２の誤り訂正部へ出力し、
    　前記第２の誤り訂正部は、前記第２受信処理信号および前記第２合成信号のそれぞれに対して前記第２の誤り訂正処理を行う、
    　請求項４に記載のデジタル放送受信装置。     Further, it includes a second compositing unit that synthesizes at least two of the plurality of first reception processing signals output from the plurality of first receiving units and outputs a second combined signal.
    The second synthesis unit outputs the second synthesis signal to the second error correction unit.
    The second error correction unit performs the second error correction processing on each of the second reception processing signal and the second composite signal.
    The digital broadcast receiving device according to claim 4.
  8. 　前記第１の誤り訂正部は、前記デジタル放送のチャネル周波数をサーチするチャネルサーチ時および前記チャネルサーチをせずに前記デジタル放送を受信する通常受信時のそれぞれの時に、前記第１合成信号に対して前記第１の誤り訂正処理を行い、
    　前記第２の誤り訂正部は、前記チャネルサーチ時に前記第２受信処理信号に対して前記第２の誤り訂正処理を行い、前記通常受信時に前記第２合成信号に対して前記第２の誤り訂正処理を行う、
    　請求項７に記載のデジタル放送受信装置。     The first error correction unit refers to the first composite signal at the time of channel search for searching the channel frequency of the digital broadcast and at the time of normal reception of receiving the digital broadcast without performing the channel search. The first error correction process is performed.
    The second error correction unit performs the second error correction processing on the second reception processing signal at the time of the channel search, and the second error correction on the second composite signal at the time of the normal reception. Do the processing,
    The digital broadcast receiving device according to claim 7.
  9. 　前記第２受信部は、さらに、前記第２受信処理信号を前記第１の合成部および第２の合成部へ出力し、
    　前記通常受信時において、前記複数の第１受信部および前記第２受信部が前記デジタル放送の同じチャネル周波数を受信している場合に、前記第１の合成部は、前記複数の第１受信処理信号および前記第２受信処理信号に基づいて前記第１合成信号を生成し、前記第２の合成部は、前記複数の第１受信処理信号および前記第２受信処理信号に基づいて前記第２合成信号を生成する、
    　請求項８に記載のデジタル放送受信装置。     The second reception unit further outputs the second reception processing signal to the first synthesis unit and the second synthesis unit.
    At the time of the normal reception, when the plurality of first receiving units and the second receiving unit are receiving the same channel frequency of the digital broadcast, the first combining unit performs the plurality of first receiving processes. The first composite signal is generated based on the signal and the second reception processing signal, and the second synthesis unit generates the second synthesis based on the plurality of first reception processing signals and the second reception processing signal. Generate a signal,
    The digital broadcast receiving device according to claim 8.
  10. 　前記第２受信部は、前記通常受信時において、前記複数の第１受信部のうちの１つの第１受信部および前記第２受信部が前記デジタル放送の同じチャネル周波数を受信している場合に、前記第２受信部内にて伝送される中間信号を前記１つの第１受信部へ出力し、
    　前記１つの第１受信部は、前記アンテナから入力された前記放送信号および前記中間信号に基づいて受信処理を行う、
    　請求項８に記載のデジタル放送受信装置。     When the first receiving unit and the second receiving unit of one of the plurality of first receiving units receive the same channel frequency of the digital broadcast at the time of the normal reception, the second receiving unit is used. , The intermediate signal transmitted in the second receiving unit is output to the one first receiving unit.
    The one first receiving unit performs reception processing based on the broadcast signal and the intermediate signal input from the antenna.
    The digital broadcast receiving device according to claim 8.
  11. 　前記１つの第１受信部および前記第２受信部のそれぞれは、前記放送信号を増幅して出力する増幅部を有し、
    　前記第２受信部は、前記第２受信部の前記増幅部から出力された増幅信号を前記１つの第１受信部へ出力し、
    　前記１つの第１受信部は、前記１つの第１受信部の前記増幅部から出力された増幅信号および前記第２受信部の前記増幅部から出力された増幅信号に基づいて受信処理を行う、
    　請求項１０に記載のデジタル放送受信装置。     Each of the one first receiving unit and the second receiving unit has an amplification unit that amplifies and outputs the broadcast signal.
    The second receiving unit outputs the amplified signal output from the amplifying unit of the second receiving unit to the one first receiving unit.
    The one first receiving unit performs reception processing based on the amplification signal output from the amplification unit of the one first receiving unit and the amplification signal output from the amplification unit of the second receiving unit.
    The digital broadcast receiving device according to claim 10.
  12. 　前記１つの第１受信部および前記第２受信部のそれぞれは、前記受信処理においてアナログ信号をデジタル信号に変換するＡＤ変換部を有し、
    　前記第２受信部は、前記第２受信部の前記ＡＤ変換部から出力したデジタル信号を前記１つの第１受信部へ出力し、
    　前記１つの第１受信部は、前記１つの第１受信部の前記ＡＤ変換部から出力されたデジタル信号および前記第２受信部の前記ＡＤ変換部から出力されたデジタル信号に基づいて受信処理を行う、
    　請求項１０に記載のデジタル放送受信装置。     Each of the one first receiving unit and the second receiving unit has an AD conversion unit that converts an analog signal into a digital signal in the reception process.
    The second receiving unit outputs a digital signal output from the AD conversion unit of the second receiving unit to the one first receiving unit.
    The one first receiving unit performs reception processing based on the digital signal output from the AD conversion unit of the one first receiving unit and the digital signal output from the AD conversion unit of the second receiving unit. Do, do
    The digital broadcast receiving device according to claim 10.
  13. 　前記第２受信部は、ＶＨＦ－Ｌｏｗ帯受信用またはＶＨＦ－Ｈｉｇｈ帯受信用のアンテナから入力されたＶＬ信号またはＶＨ信号を受信処理し、もしくは、前記複数のアンテナのうちの１つのアンテナから入力された地上波デジタル放送の前記放送信号を受信処理する、
    　請求項４に記載のデジタル放送受信装置。     The second receiving unit receives and processes the VL signal or VH signal input from the antenna for VHF-Low band reception or VHF-High band reception, or inputs from one of the plurality of antennas. Receiving and processing the broadcast signal of the terrestrial digital broadcast
    The digital broadcast receiving device according to claim 4.
  14. 　前記複数の第１受信部、前記第１の合成部、前記第１の誤り訂正部、前記第２受信部および前記第２の誤り訂正部は、１つのＬＳＩチップに含まれる、
    　請求項４に記載のデジタル放送受信装置。     The plurality of first receiving units, the first combining unit, the first error correcting unit, the second receiving unit, and the second error correcting unit are included in one LSI chip.
    The digital broadcast receiving device according to claim 4.
  15. 　前記第２受信部は、外部で発生した妨害波によって入力された信号を前記入力された信号とし、受信処理して、ノイズ情報を含む前記第２受信処理信号を出力する、
    　請求項１に記載のデジタル放送受信装置。     The second receiving unit uses a signal input by an externally generated interfering wave as the input signal, performs reception processing, and outputs the second reception processing signal including noise information.
    The digital broadcast receiving device according to claim 1.
  16. 　前記第２受信部は、前記複数のアンテナよりもノイズ源の近くに位置する他のアンテナから入力された信号を前記入力された信号とし、受信処理する、
    　請求項１５に記載のデジタル放送受信装置。     The second receiving unit uses signals input from other antennas located closer to the noise source than the plurality of antennas as the input signals and performs reception processing.
    The digital broadcast receiving device according to claim 15.
  17. 　前記複数の第１受信部のそれぞれは、前記第１受信部にて復調処理した後のデジタル情報信号に対してノイズ除去を行うノイズ除去部を有し、
    　前記ノイズ除去部は、ノイズ情報を含む前記第２受信処理信号に基づいて前記ノイズ除去を行うことで、前記第２受信処理信号に基づいて処理された処理信号を出力する、
    　請求項１６に記載のデジタル放送受信装置。     Each of the plurality of first receiving units has a noise removing unit that removes noise from the digital information signal after demodulation processing by the first receiving unit.
    The noise removal unit performs the noise removal based on the second reception processing signal including noise information, and outputs the processing signal processed based on the second reception processing signal.
    The digital broadcast receiving device according to claim 16.
  18. 　前記ノイズ除去部は、ノイズ情報を含む前記第２受信処理信号に対して振幅、位相およびタイミングの少なくとも１つを調整した後の調整後のノイズ情報信号を前記デジタル情報信号から差し引くことで、前記ノイズ除去を行う、
    　請求項１７に記載のデジタル放送受信装置。     The noise removing unit subtracts the adjusted noise information signal after adjusting at least one of the amplitude, phase, and timing with respect to the second reception processing signal including noise information from the digital information signal. Perform noise removal,
    The digital broadcast receiving device according to claim 17.
  19. 　前記ノイズ除去部は、フィルタ係数を有するフィルタ部を有し、
    　前記フィルタ部は、前記フィルタ係数に基づいて、ノイズ情報を含む前記第２受信処理信号に対して振幅、位相およびタイミングの少なくとも１つを調整することで、前記調整後のノイズ情報信号を生成する、
    　請求項１８に記載のデジタル放送受信装置。     The noise removing unit has a filter unit having a filter coefficient, and has a filter unit.
    The filter unit generates the adjusted noise information signal by adjusting at least one of the amplitude, phase, and timing of the second reception processing signal including noise information based on the filter coefficient. ,
    The digital broadcast receiving device according to claim 18.
  20. 　前記ノイズ除去部は、相関部を有し、
    　前記相関部は、前記デジタル情報信号から前記調整後のノイズ情報信号を除去した後のノイズ除去信号とノイズ情報を含む前記第２受信処理信号との相関をとり、前記相関に対応した前記フィルタ係数を前記フィルタ部へ出力する、
    　請求項１９に記載のデジタル放送受信装置。     The noise removing unit has a correlation unit and has a correlation unit.
    The correlation unit correlates the noise removal signal after removing the adjusted noise information signal from the digital information signal with the second reception processing signal including the noise information, and the filter coefficient corresponding to the correlation. Is output to the filter unit,
    The digital broadcast receiving device according to claim 19.
  21. 　前記フィルタ係数は、適応フィルタを用いた演算によって求められる、
    　請求項１９または２０に記載のデジタル放送受信装置。     The filter coefficient is obtained by an operation using an adaptive filter.
    The digital broadcast receiver according to claim 19 or 20.
  22. 　前記適応フィルタは、ＭＭＳＥ（Ｍｉｎｉｍｕｍ　Ｍｅａｎ　Ｓｑｕａｒｅ　Ｅｒｒｏｒ）、ＬＭＳ（Ｌｅａｓｔ　Ｍｅａｎ　Ｓｑｕａｒｅ）、または、ＲＬＳ（Ｒｅｃｕｒｓｉｖｅ　Ｌｅａｓｔ　Ｓｑｕａｒｅ）である、
    　請求項２１に記載のデジタル放送受信装置。     The adaptive filter is MMSE (Minimum Mean Square Error), LMS (Least Mean Square), or RLS (Recursive First Square).
    The digital broadcast receiving device according to claim 21.
  23. 　前記第１受信部は、前記デジタル情報信号および前記ノイズ除去信号のうち信号の受信品質が高いほうを前記第１受信処理信号として前記第１の合成部へ出力する、
    　請求項２０に記載のデジタル放送受信装置。     The first receiving unit outputs the higher signal reception quality of the digital information signal and the noise removing signal to the first combining unit as the first receiving processing signal.
    The digital broadcast receiving device according to claim 20.
  24. 　前記ノイズ除去部は、間欠動作を行い、前記間欠動作のうちの作動期間に前記ノイズ除去信号を出力し、前記間欠動作のうちの非作動期間に前記ノイズ除去を行わずに前記デジタル情報信号を出力する、
    　請求項２３に記載のデジタル放送受信装置。     The noise removing unit performs an intermittent operation, outputs the noise removing signal during the operating period of the intermittent operation, and outputs the digital information signal without performing the noise removing during the non-operating period of the intermittent operation. Output,
    The digital broadcast receiving device according to claim 23.
  25. 　前記第１受信部は、前記第２受信部の作動を前記第１受信部の作動に同期させるための同期情報を前記第２受信部へ出力する、
    　請求項１５～２２のいずれか１項に記載のデジタル放送受信装置。     The first receiving unit outputs synchronization information for synchronizing the operation of the second receiving unit with the operation of the first receiving unit to the second receiving unit.
    The digital broadcast receiving device according to any one of claims 15 to 22.
  26. 　前記ノイズ除去部は、前記デジタル放送のチャネル周波数をサーチするチャネルサーチ時に前記ノイズ除去を行わず、前記チャネルサーチをせずに前記デジタル放送を受信する通常受信時に前記ノイズ除去を行う、
    　請求項１７に記載のデジタル放送受信装置。     The noise removing unit does not remove the noise at the time of channel search for searching the channel frequency of the digital broadcast, and performs the noise removal at the time of normal reception of receiving the digital broadcast without performing the channel search.
    The digital broadcast receiving device according to claim 17.
  27. 　前記第２受信部は、前記チャネルサーチ時に前記複数のアンテナのうちの少なくとも１つのアンテナから入力された前記デジタル放送の放送信号を受信処理して、前記第２受信処理信号を前記第２の誤り訂正部へ出力し、前記通常受信時に前記他のアンテナから入力された前記信号を受信処理して、ノイズ情報を含む前記第２受信処理信号を前記ノイズ除去部へ出力する、
    　請求項２６に記載のデジタル放送受信装置。     The second receiving unit receives and processes the broadcast signal of the digital broadcast input from at least one of the plurality of antennas at the time of the channel search, and the second reception processing signal is the second error. The signal is output to the correction unit, the signal input from the other antenna at the time of normal reception is received and processed, and the second reception processing signal including noise information is output to the noise removal unit.
    The digital broadcast receiving device according to claim 26.
  28. 　前記ノイズ除去部は、前記通常受信時に連続動作あるいは間欠動作して、前記ノイズ除去を行う、
    　請求項２６または２７に記載のデジタル放送受信装置。     The noise removing unit performs continuous operation or intermittent operation during the normal reception to remove the noise.
    The digital broadcast receiver according to claim 26 or 27.
  29. 　前記他のアンテナは、前記複数のアンテナのうちノイズ源に最も近い１以上のアンテナと、前記のノイズ源との略中間に配置される
    　請求項１６に記載のデジタル放送受信装置。     The digital broadcast receiving device according to claim 16, wherein the other antenna is one or more antennas closest to the noise source among the plurality of antennas, and is arranged substantially in the middle of the noise source.
PCT/JP2020/024181 2019-06-21 2020-06-19 Digital broadcast reception device WO2020256123A1 (en)

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JPH0556434A (en) * 1991-08-23 1993-03-05 Sony Corp Satellite broadcast receiver
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JPH0556434A (en) * 1991-08-23 1993-03-05 Sony Corp Satellite broadcast receiver
JP2004172716A (en) * 2002-11-18 2004-06-17 Fujitsu Ten Ltd Diversity receiver
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