WO2008050387A1 - Dispositif de réception, son procédé, son programme et son support d'enregistrement - Google Patents

Dispositif de réception, son procédé, son programme et son support d'enregistrement Download PDF

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Publication number
WO2008050387A1
WO2008050387A1 PCT/JP2006/321071 JP2006321071W WO2008050387A1 WO 2008050387 A1 WO2008050387 A1 WO 2008050387A1 JP 2006321071 W JP2006321071 W JP 2006321071W WO 2008050387 A1 WO2008050387 A1 WO 2008050387A1
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WO
WIPO (PCT)
Prior art keywords
unit
reception
received signal
switching
selection
Prior art date
Application number
PCT/JP2006/321071
Other languages
English (en)
Japanese (ja)
Inventor
Satoru Suzuki
Original Assignee
Pioneer Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Corporation filed Critical Pioneer Corporation
Priority to JP2008540818A priority Critical patent/JPWO2008050387A1/ja
Priority to PCT/JP2006/321071 priority patent/WO2008050387A1/fr
Publication of WO2008050387A1 publication Critical patent/WO2008050387A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0808—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching comparing all antennas before reception
    • 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
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44209—Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards

Definitions

  • the present invention relates to a reception device, a reception processing method used in the reception device, a reception processing program for executing the reception processing method, and a recording medium on which the reception processing program is recorded.
  • broadcast wave receivers such as televisions and radios have been mounted on many moving objects such as vehicles.
  • Patent Document 1 As a technology of a receiving apparatus that performs strong diversity reception, a reception signal from an antenna that is receiving the best broadcast wave among a plurality of antennas is selected, and an image based on the selected reception signal is selected.
  • Patent Document 1 A technique for reproducing and outputting audio has been proposed (see Patent Document 1: hereinafter referred to as “conventional example”).
  • an orthogonal frequency division multiplex (hereinafter also referred to as “OFDM”) signal with a guard interval is added.
  • OFDM orthogonal frequency division multiplex
  • received signals selected from a plurality of received signals from a plurality of antennas are sequentially switched, and the respective signal powers are compared. Based on the result of this comparison, the signal received from the antenna with the highest signal power is selected! / Speak.
  • FFT Fast Fourier Transform
  • Patent Document 1 Japanese Patent No. 3793448
  • the received signal of a plurality of antenna forces is switched during a period other than the FFT window period, and the signal levels are compared. Then, the received signal from the antenna to be selected is determined within the FFT window period according to the comparison result. [0006] For this reason, in the conventional technique, the level of the signal received by each antenna is compared in a limited period other than the FFT window period in which the FFT processing is to be performed, which is different from the actual processing target period. Therefore, there was a possibility of making an incorrect decision when deciding the received signal with the optimum antenna power due to the erroneous detection of the signal level.
  • One of the problems to be solved by the present invention is to respond to a strong demand.
  • the present invention has been made in view of the above circumstances, and a receiving device and a receiving processing method that can appropriately perform reproduction of an image or sound performed by receiving a broadcast wave with a simple configuration.
  • the purpose is to provide.
  • a receiving apparatus that receives broadcast waves and reproduces at least one of video and audio, and includes antenna means having a plurality of antennas; Selecting means for selecting and outputting one of a plurality of received signals; storage means for storing information of the received signal selected by the selecting means; received signal selected by the selecting means Receiving state detection means for detecting the state of the received signal; optimal reception at the present time among the plurality of received signals based on the detection result by the receiving state detection means while sequentially switching the reception signals selected by the selection means An optimum reception signal detection means for detecting a signal and issuing a selection command for the optimum reception signal to the selection means; and the optimum reception signal detection of the reception signal selected by the selection means; In a predetermined period before the start of switching by the means, the information saving means for saving the information received by the selection signal in the storage means is selected by the selection means; and selected by the selection means Based on the information stored in the storage unit by the information storage unit over a switching
  • Reproduction content estimation means for estimating the content of reproduction in at least one of the video and audio; and during a period other than the switching period, reproduction output based on a selection result by the selection means and During the switching period, the playback content And a reproduction output means for performing reproduction output based on a result of estimation by the estimation means.
  • the present invention is a reception processing program characterized by causing an arithmetic means to execute the reception processing method of the present invention.
  • a recording medium on which the reception processing program of the present invention is recorded so as to be readable by a calculation means.
  • FIG. 1 is a block diagram schematically showing a configuration of a receiving apparatus according to a first embodiment of the present invention.
  • FIG. 2 is a block diagram showing a configuration of a received signal processing unit in FIG. 1.
  • FIG. 3 is a flow chart for explaining a process for switching to an optimum received signal by the receiving apparatus of FIG. 1.
  • FIG. 4 is a flowchart for explaining optimum received signal selection processing in FIG.
  • FIG. 5 is a block diagram schematically showing a configuration of a receiving apparatus according to a second embodiment of the present invention.
  • 6 is a block diagram showing the configuration of the received signal processing unit of FIG.
  • FIG. 7 is a flow chart for explaining a process for switching to an optimum received signal by the receiving apparatus of FIG. 5.
  • FIG. 8 is a block diagram schematically showing a configuration of a receiving apparatus according to a third embodiment of the present invention.
  • FIG. 9 is a block diagram showing a configuration of a reception signal processing unit of FIG.
  • FIG. 10 is a flow chart for explaining a process for switching to an optimum received signal by the receiving apparatus of FIG.
  • FIG. 11 is a block diagram schematically showing a configuration of a receiving apparatus according to a fourth embodiment of the present invention.
  • FIG. 12 is a block diagram showing a configuration of the reception signal processing unit of FIG. 11.
  • FIG. 13 is a flowchart for explaining a process of switching to an optimum received signal by the receiving apparatus of FIG. 11.
  • FIG. 14 is a flowchart for explaining optimum received signal determination processing in FIG.
  • FIG. 15 is a flowchart for explaining received signal switching and estimated output processing in FIG. 13.
  • a receiving apparatus that receives and processes broadcast waves subjected to OFDM modulation will be described as an example.
  • FIG. 1 is a block diagram illustrating a schematic configuration of a receiving device 100A according to the first embodiment.
  • the receiving device 100A has an antenna as an antenna means.
  • a tener unit 110, a control unit 120A as optimum reception signal detection means, an antenna switching unit 130 as selection means, and a reception signal processing unit 140A are provided.
  • the receiving device 100A includes an operation input unit 150, a sound output unit 160 as a part of the reproduction output means, and a display unit 170 as a part of the reproduction output means.
  • the antenna unit 110 receives broadcast waves.
  • the antenna unit 110 includes four antennas 111 to L 11. These antennas 111 ⁇ : L 11
  • antennas 111-111 are Located at the four corners of the roof. The reception results of antennas 111-111 are
  • the signals are output to the antenna switching unit 130 as numbers RF1 to RF4.
  • Control unit 120A controls the overall operation of receiving apparatus 100A. The operation of the receiving device 10 OA will be described later.
  • the antenna switching unit 130 selects one of the received signals RF1 to RF4 in accordance with a received signal selection command (ie, antenna switching command) ASL from the control unit 120A.
  • the reception signal selected by the antenna switching unit 130 is output to the reception signal processing unit 140A as the selection reception signal SRF.
  • the reception signal processing unit 140A processes the selected reception signal SRF from the antenna switching unit 130 under the control of the control unit 120A, and supplies the audio data ADT and display unit to the sound output unit 160. Image data ID T to be supplied to 170 is generated.
  • the reception signal processing unit 140A includes a tuner unit 141 and an OFDM demodulation unit 142 having a function of a reception state detection unit.
  • the received signal processing unit 140A includes a decoding unit 143A having functions as an optimum received signal detection unit, an information storage unit, and a reproduction content estimation unit, and a storage unit 144 as a storage unit. Further, the received signal processing unit 140A includes an audio processing unit 145 and an image processing unit 146.
  • Tuner section 141 transmits a signal of a channel to be selected (hereinafter also referred to as “desired station”) in accordance with channel selection command CSL from control unit 120A and automatic gain control signal AGC from OFDM demodulation section 144.
  • a channel selection signal S CH having an intermediate frequency is extracted from the selective reception signal SRF and output to the OFDM demodulator 142.
  • the tuner unit 141 includes an antenna input filter, a high frequency amplifier, a band pass filter (hereinafter also referred to as “RF filter”), a mixer ( A mixer), an intermediate frequency filter (hereinafter also referred to as “IF filter”), a local oscillation circuit, etc. (both not shown).
  • the low frequency component is removed by passing through the selective reception signal SRF power antenna input filter, and then specified by the automatic gain control signal AGC from the OFDM demodulator 142 by the high frequency amplifier. Amplified at the amplification factor. Such amplification is performed in order to set the signal level of the channel selection signal SCH within a predetermined range. For this reason, the automatic gain control signal AGC determines the signal level of the selected received signal SRF, and consequently the power of the broadcast wave of the desired station received by the antenna corresponding to the selected received signal SRF (hereinafter referred to as “received signal”). It comes to reflect!
  • the automatic gain control signal AGC is output from the OFDM demodulator 142 in digital form, but is used in a high-frequency amplifier after digital-analog conversion (hereinafter referred to as "DA conversion"). It's like! /
  • the signal amplified by the above-described high-frequency amplifier is generated by a local oscillation circuit in accordance with a channel selection command CSL from the control unit 120A in a mixer after a signal in a specific high-frequency range is extracted by an RF filter. Mixed with a local oscillation signal having a frequency corresponding to the desired station. Result of mixing by mixer IF signal is selected by IF filter. This selection result is subjected to analog-digital conversion (hereinafter referred to as “AD conversion”), and then output to the OFDM demodulator 142 as a channel selection signal SCH.
  • AD conversion analog-digital conversion
  • channel selection command CSL is used in the local oscillation circuit after being subjected to the force DA conversion output from the control unit 120A in digital form.
  • the OFDM demodulation unit 142 includes an orthogonal demodulation unit, an FFT unit, an error detection Z correction unit, and the like. This OFDM demodulator 142 performs OFDM demodulation processing on the channel selection signal SCH, and outputs the result as demodulated data DMD to the decoder 143A.
  • the OFDM demodulator 142 generates the above-described automatic gain control signal AGC based on the signal level of the channel selection signal SCH.
  • the generated automatic gain control signal AGC is output to the tuner unit 141 and the control unit 120A.
  • the OFDM demodulator 142 receives a bit in the OFDM demodulation result for the channel selection signal SCH. Detect error rate (BER). This detection result is output to the control unit 120A.
  • BER Detect error rate
  • BER detection by OFDM demodulator 142 is performed for m packet lengths.
  • the constant m is determined in advance based on broadcast wave transmission standards, experiments, simulations, and experiences.
  • the constant m may be a rational number that is not limited to an integer.
  • Decoding section 143A decodes demodulated data DMD encoded by the MPEG system, and generates demodulated audio data DAD and demodulated video data DID.
  • the demodulated audio data DAD and demodulated video data DID generated in this way are output to the audio processing unit 145 and the video processing unit 146.
  • the decoding unit 143A stores the decoding result in the storage unit 144 each time decoding is performed. At the time of such storage, the decoding unit 143A uses the storage area in the storage unit 144 as a so-called ring buffer, and displays video data for the latest plural (for example, five) screens and the display of the recent plural screens. Save audio data over time.
  • the decoding unit 143A executes the estimation output process under the control of the control unit 120A.
  • the decoding unit 143A estimates a decoding result based on the demodulated data DMD using a recent decoding result stored in the storage unit 144.
  • the decoding unit 143A outputs the estimation result to the audio processing unit 145 and the video processing unit 146 as demodulated audio data DAD and demodulated video data DID.
  • the estimated output process is started upon receipt of the estimated output process start command EPR for the control unit 120A.
  • the estimated output process stop command EPP is received from the control unit 120A, the estimated output process ends.
  • the audio processing unit 145 generates audio data ADT based on the demodulated audio data DAD.
  • the generated audio data ADT is output toward the sound output unit 160.
  • the video processing unit 146 generates image data IDT based on the demodulated video data DID.
  • the generated image data IDT is output to the display unit 170.
  • the operation input unit 150 includes a key unit provided in the main body of the receiving device 100A, or a remote input device including the key unit.
  • a touch panel provided on the display unit 170 is used as the key provided on the main body. Can do.
  • a configuration for inputting voice can be adopted.
  • the result of operation input to the operation input unit 150 is sent to the control unit 120A as operation input data IPD.
  • the sound output unit 160 (i) converts the audio data A DT received from the received signal processing unit 140A into an analog signal, and (ii) converts the analog signal output from the DA converter. An amplifier for amplifying; and (iii) a speech power for converting the amplified analog signal into sound. This sound output unit 160 outputs broadcast sound from the desired station.
  • the display unit 170 includes (i) a display device such as a liquid crystal display panel, an organic EL (Electro Luminescence) panel, a PDP (Plasma Display Panel), and (ii) image data received from the reception signal processing unit 140A.
  • the display unit 170 displays broadcast video from the desired station.
  • the control unit 120A controls the antenna switching unit 130 and the received signal processing unit 140A to realize video and audio reproduction processing corresponding to the desired station. Specifically, the control unit 120A responds to the user's designation input of the desired station to the operation input unit 150, and receives the channel selection command CSL of the desired station in the received signal processing unit 140A (more specifically, the tuner unit). 141).
  • the control unit 120A also monitors the BER for which the received signal processing unit 140A (more specifically, the OFDM demodulation unit 142) is also reported. Based on the monitoring result, a plurality of antennas 111 to 1 are used in order to receive and reproduce the broadcast wave from the desired desired station.
  • the number switching process is performed.
  • control unit 120A issues a received signal selection instruction ASL, an estimated output process start instruction EPR, and an estimated output process stop instruction EPP as appropriate. Details of the optimum received signal switching process performed in this way will be described later.
  • the optimum received signal switching is performed.
  • the description will be given mainly focusing on the processing.
  • selection of received signal RF1 is designated to antenna switching unit 130 by control unit 120A force selection command ASL.
  • the estimation output process accompanying the issuance of the estimation output process start instruction EPR by the control unit 120A is performed.
  • receiving apparatus 100A when the user inputs a desired station designation to operation input unit 150, a notification to that effect is sent to control unit 120A. Upon receiving this report, the control unit 120A sends the channel selection command CSL of the desired station to the tuner unit 141 in the reception signal processing unit 140A.
  • the tuner unit 141 Upon receiving the channel selection command CSL, the tuner unit 141 extracts the received signal from the desired station in the received signal RF1, which is the selected received signal SRF, which is output from the antenna switching unit 130, and uses it as the selected signal SCH. To the OFDM demodulator 142. The OFDM demodulation unit 142 that has received the channel selection signal SCH demodulates the channel selection signal SCH and sends it to the decoding unit 143A as demodulated data DMD. In parallel with the powerful demodulation process, the OFDM demodulator 142 generates an automatic gain control signal AGC and sends it to the tuner unit 141 and the control unit 120A, and sends the bit error rate BER to the control unit 120A.
  • AGC automatic gain control signal
  • the decoding unit 143A Upon receiving the demodulated data DMD, the decoding unit 143A decodes the demodulated data DMD encoded by the MPEG method, and outputs the demodulated audio data DAD and demodulated video data DID to the audio processing unit 145 and the video processing unit 146. Send. In parallel with the powerful decoding process, the decoding unit 143A sequentially stores the decoding results in the storage unit 144.
  • the audio processing unit 145 Upon receiving the demodulated audio data DAD, the audio processing unit 145 generates audio data ADT and sends it to the audio output unit 160. As a result, the signal is output from the speaker of the broadcast audio / sound output unit 160 from the desired station based on the received signal RF1.
  • the video processing unit 146 that has received the demodulated video data DID generates image data IDT and sends it to the display unit 160. As a result, it is displayed on the display device of the broadcast image power display unit 170 from the desired station based on the received signal RF1.
  • step S 11 in the optimum reception signal switching process shown in FIG. 3 is executed.
  • control unit 120A force OFDM
  • the BER reported from the demodulator 142 is monitored to determine whether or not the BER value is greater than a predetermined threshold THV. If the result of this determination is negative (step S11: N), the control unit 120A determines that the selection of the received signal at the present time is appropriate, and repeats step S11.
  • step S11 If the result of determination in step S11 is affirmative (step Sl 1: Y), control unit 120A determines that the selection of the received signal at the present time is not appropriate. Then, the process in the control unit 120A proceeds to step S12.
  • step S12 control unit 120A force estimation output processing start command EPR is sent to decoding unit 143A. Receiving this estimated output process start command EPR, the decoding unit 143A starts the estimated output process of step S13.
  • decoding section 143A stops the decoding process on demodulated data DMD from OFDM demodulation section 142. Subsequently, the decoding unit 143A reads the latest decoding result stored in the storage unit 144. Then, the decoding unit 143A decodes the demodulated data DMD based on the read decoding result, estimates the decoding result that would have been obtained, and outputs the demodulated audio data DAD and demodulated video data DID. To the audio processing unit 145 and the video processing unit 146.
  • the audio output is based on the estimation result by the decoding unit 143A and is output from the speaker of the audio / sound output unit 160 based on the estimation result by the decoding unit 143A.
  • step S14 an optimum received signal selection process is performed.
  • the selection of the reception signal by the next antenna is specified to the antenna switching unit 130 by the control unit 120A force selection command ASL. To do.
  • the antenna switching unit 130 Upon receiving this selection command ASL, the antenna switching unit 130 sends the reception signal from the designated next antenna to the tuner unit 141 as the selection reception signal SRF.
  • the BER of the broadcast wave component from the desired station in the specified received signal is detected by the OFDM demodulator 142 and reported to the control unit 120A. Is done.
  • control unit 120A obtains the BER of the signal received by the next antenna reported from OFDM demodulator 142.
  • step S23 the control unit 120A determines whether or not the BER has been acquired for all of the received signals RF1 to RF4, including the BER for RF1 acquired before the start of step S14. . If the result of this determination is negative (step S23: N), the process returns to step S21. Thereafter, the processes in steps S21 to S23 are repeated until the result of the determination in step S23 becomes affirmative.
  • step S24 the received signal that has the smallest BER among the four BERs acquired by the control unit 120A is determined as the optimum received signal.
  • step S25 the control unit 120A instructs the antenna switching unit 130 to select the optimum received signal determined by the selection command ASL.
  • the optimum switching signal at that time is sent from the antenna switching unit 130 to the OFDM demodulator 142 as the selected receiving signal SRF.
  • the OFDM demodulator 142 performs demodulation processing on the selected received signal SRF 1 and sends the demodulation result to the decoder 143A.
  • step S25 ends, the process of step S14 ends, and the process of the control unit 120A proceeds to step S15 of FIG.
  • control unit 120A force estimation output processing end command EPP is sent to decoding unit 143A.
  • the decoding unit 143A ends the estimated output process of step S13.
  • the decoding unit 143A that has finished the estimation output process decodes the demodulated data DMD, sends it to the audio processing unit 145 and the video processing unit 146 as demodulated audio data DAD and demodulated video data DID, and in parallel with the decoding process.
  • the decoding unit 143A resumes the process of sequentially storing the decoding results in the storage unit 144.
  • step S15 when the process of step S15 is completed, the process of the control unit 120A is performed in step S11. Return to. As a result, the monitoring of the BER reported from the OFDM demodulator 142 by the control unit 120A is resumed.
  • the received signal selected by the control unit 120A antenna switching unit 130 is sequentially switched to determine the optimum received signal. Then, the control unit 120A causes the antenna switching unit 130 to select the determined optimum received signal.
  • the decoding unit 143A force the demodulated data DMD from the OFDM demodulator 142 related to the optimum received signal is decoded to V, and if obtained The decoding result is stored in the storage unit 144 and estimated based on the latest decoding result. Then, based on the estimation result, sound is also output as the speaker power of the sound output unit 160, and an image is displayed on the display device of the display unit 170.
  • the first embodiment it is possible to appropriately reproduce video or audio performed by receiving broadcast waves with a simple configuration that does not give the user a sense of incongruity.
  • the second embodiment also receives a broadcast wave that is mounted on a vehicle and has been subjected to OFDM modulation after being coded by the MPEG method.
  • An example of a receiving device to be processed will be described.
  • FIG. 5 is a block diagram illustrating a schematic configuration of a receiving device 100B according to the second embodiment.
  • the receiving device 100B is different from the receiving device 100A according to the first embodiment in that it includes a control unit 120B instead of the control unit 120A, and instead of the received signal processing unit 140A.
  • the only difference is the provision of the received signal processing unit 140B.
  • the received signal processing unit 140B is different from the received signal processing unit 140A in that a decoder unit 143B is used instead of the decoder unit 143A. Only the point to prepare is different.
  • the decoder unit 143B decodes the decoded data DMD encoded by the MPEG method, and generates demodulated audio data DAD and demodulated video data DID.
  • the demodulated audio data DAD and demodulated video data DID thus generated are output to the audio processing unit 145 and the video processing unit 146.
  • the decoding unit 143B stores a part of the decoding result in the storage unit 144.
  • the decoding unit 143B uses the storage area in the storage unit 144 as a so-called ring buffer, and the video data of a predetermined area in the recent plural (for example, five) screens and the recent plural screens Save audio data for the display time of the specified area.
  • the predetermined area is an area sufficiently large for the estimated output process described later. This predetermined area is determined in advance based on the display method (for example, interlace method power non-interlace method) in the display unit 170, broadcast wave transmission standard, experiment, simulation, experience, and the like.
  • the decoding unit 143B executes an estimation output process based on the decoding result stored in the storage unit 144 under the control of the control unit 120B. This estimated output process is started when the estimated output process start command EPR from the control unit 120B is received and then the demodulated data DMD force from the OFDM demodulator 142 is related to the predetermined area. When the estimated output process is started, the decoding unit 143B reports the estimated output process start notification EPB to the control unit 120B.
  • the estimated output processing by the decoding unit 143B is terminated when the estimated output processing stop command EPP is received from the control unit 120B, as in the case of the decoding unit 143A.
  • control unit 120B Compared with control unit 120A, control unit 120B only waits for estimated output processing start notification EPB from decoding unit 143B, and starts optimum reception signal selection processing similar to step S14 described above. Differently.
  • the receiving apparatus 100B configured as described above will be described mainly focusing on the optimum received signal switching process.
  • the selection of the received signal RF1 is selected by the antenna switching module by the control unit 120B force selection command ASL.
  • the decoding unit 143B performs the estimated output process accompanying the issuance of the estimated output process start command EPR by the control unit 120B.
  • reception apparatus 100B normal reception processing other than optimal reception signal switching processing is executed in the same manner as in reception apparatus 100A according to the first embodiment.
  • step S31 in the optimum reception signal switching process shown in FIG. 7 is executed.
  • step S31 as in step S11 described above, the BER reported from the control unit 120B power OFDM demodulator 142 is monitored to determine whether or not the BER value is greater than a predetermined threshold THV. If the result of this determination is negative (step S31: N), the control unit 120B determines that the selection of the received signal at the present time is appropriate, and repeats step S31.
  • step S31 If the result of determination in step S31 is affirmative (step S31: Y), control unit 120B determines that the selection of the received signal at the present time is not appropriate. Then, the process in the control unit 120B proceeds to step S32.
  • step S32 control unit 120B force estimation output process start command EPR is sent to decoding unit 143B.
  • the decoding unit 143B waits in step S33 until the demodulated data DMD force from the OFDM demodulating unit 142 is related to the predetermined area. Then, when the demodulated data DMD is related to the predetermined area, the estimated output process of the decoding unit 143B force step S34 is started.
  • step S34 first, decoding section 143B stops decoding processing on demodulated data DMD from OFDM demodulating section 142, and reports estimated output processing start notification EPB to control unit 120B. Subsequently, the decoding unit 143B reads the latest decoding result stored in the storage unit 144. Then, the decoding unit 143B decodes the demodulated data DMD based on the read decoding result, estimates the decoding result that would have been obtained, and outputs the demodulated audio data DAD and the demodulated video data. Data DID is sent to the audio processing unit 145 and the video processing unit 146.
  • the sound based on the estimation result by the decoding unit 143B is output from the speaker of the sound output unit 160 and the decoding unit 143B.
  • the image power based on the result of the estimation is displayed on the display device of the display unit 170.
  • step S35 the process similar to the process in step S14 by the control unit 120A described above is executed by the control mute 120B.
  • an estimated output processing end command EPP is sent to decoding section 143B.
  • the decoding unit 143B ends the estimated output processing of step S34, decodes the demodulated data DMD, and uses the audio processing unit 145 and the video as demodulated audio data DAD and demodulated video data DID.
  • the decoding unit 143B resumes the process of sequentially storing the decoding result in the storage unit 144.
  • step S36 when the process of step S36 ends, the process of the control unit 120B returns to step S31. As a result, the monitoring of the BER reported from the OFDM demodulator 142 by the control unit 120B is resumed.
  • the control unit 120B force estimation output processing start command EPR is sent to the decoding unit 143B.
  • the decoding unit 143B waits for the demodulated data DMD from the OFDM demodulating unit 142 to be related to the predetermined area, and then sends the estimated output processing start notification EPB to the control unit. Report to 120B and start estimation output processing.
  • the control unit 120B Upon receiving the estimated output process start notification EPB, the control unit 120B sequentially switches the reception signals selected by the antenna switching unit 130 to determine the optimum reception signal. Then, the control unit 120B causes the antenna switching unit 30 to select the determined optimum received signal.
  • the decoding unit 143B decodes the demodulated data DMD from the OFDM demodulator 142 related to the optimal received signal.
  • the decoding result that would have been obtained is stored in the storage unit 144 and is estimated based on the latest decoding result. Then, based on the estimation result, sound is also output as the speaker power of the sound output unit 160, and an image is displayed on the display device of the display unit 170.
  • the third embodiment also receives a broadcast wave that is mounted on a vehicle and has been subjected to OFDM modulation after being coded by the MPEG method.
  • An example of a receiving device to be processed will be described.
  • FIG. 8 is a block diagram illustrating a schematic configuration of a receiving device 100C according to the third embodiment.
  • the receiving device 100C is different from the receiving device 100A according to the first embodiment in that it includes a control unit 120C instead of the control unit 120A, and instead of the received signal processing unit 140A. The only difference is that it has a received signal processing unit 140C.
  • the received signal processing unit 140C is different from the received signal processing unit 140A only in that a decoder unit 143C is provided instead of the decoder unit 143A.
  • the decoder unit 143C decodes the decoded data DMD encoded by the MPEG method, and generates demodulated audio data DAD and demodulated video data DID.
  • the demodulated audio data DAD and demodulated video data DID thus generated are output to the audio processing unit 145 and the video processing unit 146.
  • the decoding unit 143C upon receiving the estimated output processing start command EPR from the control unit 120C, the decoding unit 143C starts saving the decoding result in the storage unit 144. Then, the video data for a plurality of (for example, five) screens sufficient for the estimated output processing similar to the case of the first embodiment and the audio data over the display times of the recent plurality of screens are stored. . This way When the storage of the decoded result is completed, the decoding unit 143C starts the estimated output process and reports the estimated output process start notification EPC to the control unit 120C.
  • the estimated output process by the decoding unit 143C ends when the estimated output process stop command EPP is received from the control unit 120C, as in the case of the decode unit 143A.
  • control unit 120C is different from the control unit 120A only in that it waits for the estimated output process start notification EPC from the decoding unit 143C and starts the optimum received signal selection process similar to step S14 described above.
  • the receiving apparatus 100C configured as described above will be described mainly focusing on the optimum received signal switching process.
  • selection of received signal RF1 is designated to antenna switching unit 130 by control unit 120C force selection command ASL.
  • the decoding unit 143C the estimated output process accompanying the issuance of the estimated output process start command EPR by the control unit 120C is performed.
  • step S41 in the optimum reception signal switching process shown in FIG. 10 is executed.
  • step S41 as in step S11 described above, the BER reported from the control unit 120C power OFDM demodulator 142 is monitored to determine whether or not the BER value is greater than a predetermined threshold THV. If the result of this determination is negative (step S41: N), the control unit 120C determines that the selection of the received signal at the present time is appropriate, and repeats step S41.
  • step S41 determines that the selection of the received signal at the present time is not appropriate. Then, the process in the control unit 120C proceeds to step S42.
  • step S42 control unit 120C force estimation output process start command EPR is sent to decoding unit 143C.
  • the decoding unit 143C receives the decoding result of the demodulated data DMD from the OFDM demodulation unit 142 in step S43. Save.
  • the decoding unit 143C receives the decoding result of the demodulated data DMD from the OFDM demodulation unit 142 in step S43. Save.
  • step S44 first, the decoding process on the demodulated data DMD from the decoding unit 143C power OFDM demodulation unit 142 is stopped, and the estimated output processing start notification EPC is reported to the control unit 120C. Subsequently, the decoding unit 143C performs estimation output processing similar to the processing in step S13 by the decoding unit 143A in the first embodiment. The result of the estimation output processing in step S44 is sent to the audio processing unit 145 and the video processing unit 146 as demodulated audio data DAD and demodulated video data DID.
  • the audio output is based on the estimation result by the decoding unit 143C and is output from the speaker of the audio / sound output unit 160 based on the estimation result by the decoding unit 143C.
  • step S45 the process similar to the process in step S14 by the control unit 120A described above is executed by the control unit 120C.
  • an estimated output processing end command EPP is sent to decoding section 143C.
  • the decoding unit 143C ends the estimated output processing of step S44, decodes the demodulated data DMD, and uses the audio processing unit 145 and the video as demodulated audio data DAD and demodulated video data DID. Processing to be sent to the processing unit 146 is resumed.
  • step S46 ends, the process of the control unit 120C returns to step S41. As a result, monitoring of the BER reported from the OFDM demodulator 142 by the control unit 120C is resumed.
  • the control unit 120C force estimation output processing start command EPR is sent to the decoding unit 143C.
  • the decoding unit 143C stores the decoding result of the demodulated data DMD from the OFDM demodulating unit 142 by an amount sufficient for the estimated output processing.
  • the decoding unit 143C reports the estimated output process start notification EPC to the control unit 120C and starts the estimated output process.
  • the control unit 120C Upon receiving the estimated output processing start notification EPC, the control unit 120C sequentially switches the reception signals selected by the antenna switching unit 130 to determine the optimum reception signal. Then, the control unit 120C causes the antenna switching unit 30 to select the determined optimum received signal.
  • the decoding unit 143C will demodulate the demodulated data DMD from the OFDM demodulator 142 related to the optimal received signal V, and it may have been obtained.
  • the decoding result is stored in the storage unit 144 and estimated based on the latest decoding result. Then, based on the estimation result, sound is also output as the speaker power of the sound output unit 160, and an image is displayed on the display device of the display unit 170.
  • the video or sound that is performed by receiving a broadcast wave with a simple configuration that does not give the user a sense of incongruity. Voice reproduction can be performed appropriately.
  • the fourth embodiment also receives a broadcast wave that is mounted on a vehicle and has been subjected to OFDM modulation after MPEG code encoding is performed.
  • An example of a receiving device to be processed will be described.
  • FIG. 11 is a block diagram illustrating a schematic configuration of a receiving device 100D according to the fourth embodiment.
  • the receiving device 100D is provided with a control unit 120D instead of the control unit 120A as compared with the receiving device 100A according to the first embodiment, and instead of the received signal processing unit 140A. Equipped with reception signal processing unit 140D Only the point is different.
  • reception signal processing unit 140D differs from reception signal processing unit 140A only in that it includes a decoder unit 143D instead of decoder unit 143A.
  • the decoder unit 143D decodes the decoded data DMD encoded by the MPEG method, and generates demodulated audio data DAD and demodulated video data DID.
  • the demodulated audio data DAD and demodulated video data DID thus generated are output to the audio processing unit 145 and the video processing unit 146.
  • the decoding unit 143C sequentially stores the decoding results in the storage unit 144 in the same manner as the decoder unit 143A.
  • the decoding unit 143D selects the specified received signal according to the selection command ASL. Command. Thereafter, the decoding unit 143D reports to the control unit 120D a received signal switching report SWA indicating that switching to the designated received signal has been performed.
  • the decoding unit 143D when receiving the received signal switching request SWR of the control unit 120D force when the estimated output process is not being performed, the decoding unit 143D starts the estimated output process. In the estimation output process, the decoding unit 143D performs the same process as the estimation output process by the decoding unit 143A.
  • the decoding unit 143D upon receiving the optimum signal determination notification SLA designating the type of received signal from the control unit 120D, the decoding unit 143D sends the selection of the designated received signal to the antenna switching unit 130 according to the selection command ASL. Command. Then, the decoding unit 143D stops the estimation output process.
  • control unit 120D controls the reception signal processing unit 140D to realize the reproduction processing of video and audio corresponding to the desired station. Specifically, the control unit 120D, like the control unit 120A, responds to the input of the desired station designation by the user to the operation input unit 150, and receives the channel selection command CSL of the desired station as the reception signal processing unit 140C. (For more details, send it to the tuner unit 141).
  • control unit 120D is similar to the control unit 120A in that the received signal processing unit 1 40D (more specifically, OFDM demodulator 142) also monitors the reported BER. Then, based on the monitoring result, in order to receive and reproduce the broadcast wave from the desired desired station, a plurality of antennas 111-: L 11 power received signals RF1-RF4 are selected. The best receiving
  • Optimal received signal switching processing for switching to a received signal is performed.
  • control unit 120D In the optimal received signal switching process, the control unit 120D appropriately issues a received signal switching request SWR and an optimal signal determination notification SLA. Details of the optimum received signal switching process performed in this way will be described later.
  • the receiving apparatus 100D configured as described above will be described mainly focusing on the optimum received signal switching process.
  • selection of received signal RF1 is designated to antenna switching unit 130 by control unit 120D force selection command ASL.
  • the decoding unit 143D performs an estimated output process! /.
  • step S51 in the optimum reception signal switching process shown in FIG. 13 is executed.
  • step S51 as in step S11 described above, the BER reported from the control unit 120D power OFDM demodulator 142 is monitored to determine whether or not the BER value is greater than a predetermined threshold THV. If the result of this determination is negative (step S51: N), the control unit 120D determines that the selection of the received signal at the present time is appropriate, and repeats step S51.
  • step S51 If the result of the determination in step S51 is affirmative (step S51: Y), control unit 120D determines that the selection of the received signal at the present time is not appropriate. Then, the process in the control unit 120D proceeds to step S52.
  • step S52 control unit 120D force optimum signal determination processing is performed.
  • the control unit 120D sends a request for switching to the next received signal by a received signal switching request SWR specifying the type of received signal. Decoder unit Sends to 143D.
  • step S62 the control unit 120D determines whether or not the received signal switching report SWA is also received by the decoder unit 143D. If the result of this determination is negative (step S62: N), the control unit 120D repeats the process of step S62.
  • step S63 the control unit 120D obtains the BER of the signal received by the next antenna reported from the OF DM demodulator 142.
  • step S64 the control unit 120D determines whether or not the BER has been acquired for all the received signals RF1 to RF4, including the BER for RF1 acquired before the start of step S52. . If the result of this determination is negative (step S64: N), the process returns to step S61. Thereafter, the processes in steps S61 to S64 are repeated until the determination result in step S64 becomes affirmative.
  • step S64 If the BER is acquired for all of the received signals RF1 to RF4 and the result of the determination in step S64 is affirmative (step S64; Y), the process proceeds to step S65.
  • step S65 the received signal having the smallest BER among the four BERs acquired by the control unit 120D force is determined as the optimum received signal.
  • step S65 When the process of step S65 is completed in this way, the process of step S52 is completed, and the process of the control unit 120D proceeds to step S54 of FIG.
  • step S54 the control unit 120D sends an optimum signal determination notification SLA designating the type of the optimum received signal and the received signal to the decoding unit 143D. Thereafter, the process of the control unit 120D returns to step S51. As a result, the monitoring power of the BER reported from the OFDM demodulator 142 by the control unit 120D is resumed.
  • the decoding unit 143D when receiving the received signal switching request SWR transmitted first by the control unit 120D in step S52, the decoding unit 143D starts the received signal switching and estimated output processing in step S53.
  • the decoding unit 143D force starts the estimated output process of step S71 and also starts the received signal switching process of steps S72 to S75.
  • step S71 the decoding unit 143D force the decoding unit 143A in the first embodiment
  • the same estimated output processing as the processing in step S13 is performed.
  • the result of the estimation output processing in step S71 is sent to the audio processing unit 145 and the video processing unit 146 as demodulated audio data DAD and demodulated video data DID.
  • the sound based on the estimation result by the decoding unit 143D is output from the speaker of the sound output unit 160, and the image power based on the estimation result by the decoding unit 143D is output. Displayed on the display device of display unit 170.
  • the decoding unit 143D performs a received signal selection process.
  • the decoding unit 143D selects the reception signal specified in the reception signal switching request SWR by the selection command ASL to the antenna switching unit 130. Command.
  • the decoding unit 143D sends a received signal switching report SWA to the control unit 120D.
  • step S73 the decoding unit 143D determines whether or not it has received the reception signal switching request SWR from the control unit 120D. If the result of this determination is affirmative (step S73: Y), the process returns to step S72.
  • step S73 If the result of determination in step S73 is negative (step S73: N), the process proceeds to step S74.
  • step S74 it is determined whether or not the optimum signal determination notification SLA of the control unit 120D force has been received as a selection result of the decoding unit 143D force received signal.
  • step S74: N If the result of the determination in step S74 is negative (step S74: N), the process returns to step S73. On the other hand, when the result of the determination in step S74 is affirmative (step S74: Y), the process proceeds to step S75.
  • step S75 the antenna switching unit 130 is commanded to select the received signal specified in the optimum signal determination notification SLA by the decoding unit 143D force selection command ASL.
  • step S75 When the process of step S75 is completed in this way, the decoding unit 143D ends the estimation output process of step S71. Thereby, the process of step S53 is completed. After that, the decoding unit 143D decodes the demodulated data DMD, and resumes the process of sending it to the audio processing unit 145 and the video processing unit 146 as demodulated audio data DAD and demodulated video data DID. At the same time, the process of saving the decoding result in the storage unit 144 is resumed.
  • the decoding unit 143D obtains the decoding result that would have been obtained if the demodulation data DMD from the OFDM demodulation unit 142 related to the optimal reception signal was performed. The estimation is made based on the latest decoding result stored in the storage unit 144. Based on the estimation result, sound is also output from the speaker output of the sound output unit 160, and an image is displayed on the display device of the display unit 170.
  • the present invention is not limited to the first to fourth embodiments described above, and various modifications are possible.
  • whether or not the selected received signal SRF is in an appropriate state for reception processing is determined based on the bit error rate (BER) in the selected received signal SRF. However, it may be determined based on the value of the automatic gain control signal AGC that reflects the power of the selected received signal SRF!
  • the decoding unit 143A to 143D force OFDM demodulation unit 142 for the optimum received signal during the optimum received signal selection process for both the image and the sound. If demodulated data from DMD was performed, The wax decoding result is estimated based on the latest decoding result stored in the storage unit 144. On the other hand, for the sound, the sound output unit 160 may output the sound immediately before the start of the optimum reception signal selection process with the volume reduced during the optimum reception signal selection process. Oh ,.
  • a modification similar to the modification of the first embodiment to the second embodiment may be performed on the third or fourth embodiment, or the third embodiment may be modified with respect to the first embodiment. Modifications similar to the modifications can be made to the second or fourth embodiment. Furthermore, the same modification as the modification of the first embodiment to the fourth embodiment is performed on the second or third embodiment.
  • the present invention is applied to a receiving device mounted on a vehicle.
  • the present invention is applied to a receiving device mounted on a moving body other than the vehicle. Apply it.
  • control unit, OFDM demodulation unit, decoding unit, audio processing unit, and video processing unit in the above embodiment are a central processing unit (CPU), a digital signal processor (DSP), and a read-only unit. It is configured as a computer as a calculation means equipped with a memory (ROM: Read Only Memory), a random access memory (RAM: Random Access Memory), etc., and a program prepared in advance is executed by the computer. You may make it perform the process in a form.
  • This program is recorded on a computer-readable recording medium such as a hard disk, a CD-ROM, or a DVD, and the recording medium force is also read out by the computer and executed.
  • this program may be obtained in the form recorded on a portable recording medium such as a CD-ROM or DVD, and may be obtained in the form of delivery via a network such as the Internet. Please do it.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Multimedia (AREA)
  • Radio Transmission System (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

Dans le cas où un signal de réception sélectionné par une unité de commutation d'antennes (130) parmi une pluralité de signaux de réception reçus par une pluralité d'antennes est jugé comme n'étant pas correct, une unité de commande (120A) commute dans le bon ordre les signaux de réception sélectionnés dans l'unité de commutation d'antennes (130), détermine le signal de réception optimum et amène l'unité de commutation d'antennes (130) à effectuer la sélection du signal de réception optimum. D'une part, pendant le traitement de sélection du signal de réception optimum, une unité de décodage (143A) estime un résultat de décodage, qui pourrait être obtenu si une DMD de données de décodage relativement au signal de réception optimum était effectuée, conformément à un résultat de décodage récent stocké dans une unité de mémoire (144). D'autre part, conformément au résultat estimé, un son est sorti d'une unité de sortie audio (160) et une image est affichée sur une unité d'affichage (170). En conséquence, la reproduction d'une vidéo ou d'un son effectuée en recevant une onde de diffusion peut être réalisée avec une structure simple.
PCT/JP2006/321071 2006-10-23 2006-10-23 Dispositif de réception, son procédé, son programme et son support d'enregistrement WO2008050387A1 (fr)

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JP2008540818A JPWO2008050387A1 (ja) 2006-10-23 2006-10-23 受信装置、その方法、そのプログラム、及び、その記録媒体
PCT/JP2006/321071 WO2008050387A1 (fr) 2006-10-23 2006-10-23 Dispositif de réception, son procédé, son programme et son support d'enregistrement

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH077464A (ja) * 1993-06-16 1995-01-10 Saakit Design:Kk ダイバーシティー受信機
JP2000138874A (ja) * 1998-11-04 2000-05-16 Sharp Corp デジタル放送受信装置
JP2002077005A (ja) * 2000-08-25 2002-03-15 Pioneer Electronic Corp 受信装置
JP2003134064A (ja) * 2001-10-26 2003-05-09 Hitachi Ltd デジタル放送補完方法およびデジタル放送受信システム
JP2006060709A (ja) * 2004-08-23 2006-03-02 Mobile Hoso Kk 受信装置及び受信方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH077464A (ja) * 1993-06-16 1995-01-10 Saakit Design:Kk ダイバーシティー受信機
JP2000138874A (ja) * 1998-11-04 2000-05-16 Sharp Corp デジタル放送受信装置
JP2002077005A (ja) * 2000-08-25 2002-03-15 Pioneer Electronic Corp 受信装置
JP2003134064A (ja) * 2001-10-26 2003-05-09 Hitachi Ltd デジタル放送補完方法およびデジタル放送受信システム
JP2006060709A (ja) * 2004-08-23 2006-03-02 Mobile Hoso Kk 受信装置及び受信方法

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