WO2003075473A1 - Receiver apparatus - Google Patents

Receiver apparatus Download PDF

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Publication number
WO2003075473A1
WO2003075473A1 PCT/JP2003/001512 JP0301512W WO03075473A1 WO 2003075473 A1 WO2003075473 A1 WO 2003075473A1 JP 0301512 W JP0301512 W JP 0301512W WO 03075473 A1 WO03075473 A1 WO 03075473A1
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WO
WIPO (PCT)
Prior art keywords
signal
circuit
frequency
power
broadcast
Prior art date
Application number
PCT/JP2003/001512
Other languages
French (fr)
Japanese (ja)
Inventor
Shigetaka Noguchi
Takamitsu Kitayama
Shunichi Satoh
Original Assignee
Sharp Kabushiki Kaisha
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 Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Priority to AU2003211511A priority Critical patent/AU2003211511A1/en
Publication of WO2003075473A1 publication Critical patent/WO2003075473A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal

Definitions

  • the present invention relates to a receiving device such as a portable device for receiving a broadcast service signal such as digital terrestrial broadcasting.
  • a receiving device such as a portable device for receiving a broadcast service signal such as digital terrestrial broadcasting.
  • a transmission band 61 of about 6 MHz is divided into 13 segments 62, and all 13 segments are converted into one channel of HDTV (high-definition television).
  • HDTV high-definition television
  • Fig. 6 (b) 13 segments can be divided into a maximum of three layers, and in addition to fixed reception layers 64 and 66, mobile reception layer 65 can be set. It is. Since the modulation scheme is arbitrarily determined for each layer, the mobile reception layer is located at the center of the frequency band to facilitate radio wave reception and reduce the system load on the mobile receiver.
  • One segment is allocated, and a DQPSK modulation method that is resistant to interference and interference is used as the modulation method.
  • terrestrial digital broadcasting for mobiles may not provide broadcasting services early in the morning or late at night due to viewing demand and maintenance, etc., so it is always possible to receive broadcasting services even within the broadcasting area That is not to say.
  • the location of the mobile terminal is not fixed, there is a possibility that the mobile terminal may go out of the broadcasting service area.
  • FIG. 7 shows an example of a configuration of a receiver having a carrier sense.
  • This receiving device includes an antenna 101, a band-pass filter 102, a high-frequency amplifier 104, a detection circuit 105, a local oscillator 107, a demodulation circuit 108, a control circuit 109, and a memory. It consists of a circuit 110.
  • a frequency converter 106 and a power distributor 103 are arranged.
  • the detection circuit 105 connected to the power divider 103 detects the received power, so that at least the high-frequency amplifier circuit 104 and the frequency converter 106 always have a power supply. It is necessary to supply power, and there is a problem if the intention is to reduce power consumption like a mobile terminal.
  • the power divider 103 and the frequency converter 106 can use passive elements such as resistors, capacitors, coils, and diodes, which are passive elements, and there is no need to supply power to themselves. Therefore, power consumption can be reduced.
  • passive elements such as resistors, capacitors, coils, and diodes, which are passive elements, and there is no need to supply power to themselves. Therefore, power consumption can be reduced.
  • a passive mixer using the passive element there is a problem that a loss of received power increases when a received signal is frequency-converted. In this case, in order to operate the receiving device normally, it is necessary to compensate for the loss of the received power, and the high-frequency amplifier 104 requires a high gain, so that the power is excessively consumed.
  • an object of the present invention is to provide a receiving apparatus capable of achieving both low power consumption and determination of the presence / absence of a broadcasting service for a mobile object in view of the above problems. Disclosure of the invention
  • a first invention is a receiving apparatus for receiving a broadcast service signal, comprising: a detection circuit that detects a signal of a specific broadcast frequency band among the received signals; and an amplification circuit that amplifies the received signal.
  • a demodulation circuit that demodulates an amplified signal of the amplification circuit; and a signal detected by the detection circuit, when the signal detected is a level that can be demodulated by the demodulation circuit, supplies power to the amplification circuit, and a signal detected by the detection circuit.
  • a control circuit that does not supply power to the amplifier circuit if the demodulation circuit is at a level that cannot be demodulated.
  • a second invention is the receiving device according to the first invention, wherein the detection circuit includes a local oscillation unit that outputs a local signal corresponding to the specific broadcast frequency band, based on the local signal. Frequency converting means for converting the received signal into an intermediate frequency signal or a baseband signal corresponding to the specific broadcast frequency, and detecting means for detecting the intensity of the intermediate frequency signal or the baseband signal.
  • a third invention is the receiving device according to the second invention, wherein the frequency conversion means of the detection circuit is a passive mixer.
  • a fourth invention is the receiving device according to the first invention, wherein the demodulation circuit converts the received signal into an intermediate signal corresponding to the specific broadcast frequency based on a local signal output by the local oscillation unit.
  • Item 2 The receiving device according to Item 1.
  • a bandpass filter for passing a signal of a specific broadcast frequency band out of the received signal, and a detection circuit for detecting a signal passing through the bandpass filter
  • An amplifier circuit for amplifying the signal passed through the band-pass filter; a demodulation circuit for demodulating the amplified signal of the amplifier circuit; and a signal detected by the detection circuit as long as the signal can be demodulated by the demodulation circuit.
  • Control means for supplying power to the amplification circuit, and not supplying power to the amplification circuit if there is no signal detected by the detection circuit or if the level cannot be demodulated by the demodulation circuit. It is characterized by the following.
  • a sixth invention is the receiver according to the fifth invention, wherein the band-pass filter is provided with filters that pass only the frequency band of one broadcast channel by the number of broadcast channels to be received.
  • a switch for selecting a signal in a frequency band of a specific broadcast channel from among the signals passing through the band-pass filter is provided.
  • a seventh invention is a receiving apparatus for receiving a signal of a broadcast service, wherein the function of amplifying the received signal, an amplifying circuit capable of switching a function of bypassing the received signal, and a specific broadcast signal of the bypassed received signal are provided.
  • a detection circuit that detects a signal in a frequency band; a demodulation circuit that demodulates an amplified signal of the amplification circuit; a detection signal that bypasses the amplification circuit and is detected by the detection circuit;
  • a control circuit for amplifying the received signal by the amplifying circuit only when the demodulation circuit can demodulate the signal.
  • FIG. 1 is a block diagram illustrating a configuration of a receiving apparatus according to the first embodiment.
  • FIG. 2 is a flowchart showing the operation of the receiving apparatus according to the first embodiment and the second embodiment.
  • FIG. 3 is a block diagram showing a configuration of a receiving apparatus according to the second embodiment.
  • FIG. 4 is a block diagram illustrating a configuration of a receiving device according to the third embodiment.
  • FIG. 5 is a flowchart showing an operation of the receiving apparatus according to the third embodiment.
  • FIG. 6 is a diagram illustrating broadcast waves of a terrestrial digital TV for mobile terminals.
  • FIG. 7 is a diagram illustrating an example of a conventional receiving apparatus. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a block diagram showing a configuration of a receiving apparatus according to the first embodiment
  • FIG. 2 is a flowchart showing a method of detecting a broadcast according to the first embodiment.
  • the receiver shown in Fig. 1 has an antenna 1, a bandpass filter 2, a power divider 3, a high-frequency amplifier 4, a detector 5, a first frequency converter 6, a baseband demodulator 8, a control circuit 9, and a memory. It is composed of a circuit 10.
  • the detection circuit 5 includes a local oscillation unit configured by a local oscillator 7 and a detection unit configured by other functional blocks 11 in the detection circuit 5.
  • the local oscillator 7 also has a function of supplying a local signal to the first frequency converter 6.
  • the antenna 1 for receiving terrestrial digital broadcasting for mobiles is connected to a bandpass filter 2 with a wide passband characteristic that allows the broadcast frequency band of all channels to pass, and the bandpass filter 2 is connected to a power divider 3 I have.
  • Power distributor 3 Connected to the amplifier (LNA) 4a and the second frequency converter 5a to divide the broadcast received signal power into the first received signal (SI G11) and the second received signal (SI G12) have.
  • the first received signal (SIG11) is input to the low noise amplifier 4a and is amplified by a certain gain of the low noise amplifier 4a.
  • the noise amplifier 4a is connected to the variable gain amplifier 4b, and the variable gain amplifier 4b receives the power amplification corresponding to the gain set by the control circuit 9 according to the received signal power. Do.
  • the variable gain amplifier 4b is connected to the first frequency converter 6, and the first frequency converter 6 receives a local signal corresponding to a broadcast frequency band from the local oscillator 7 to thereby input the first input signal. Down converted to the first baseband signal (SIG11B).
  • the first frequency converter 6 is connected to the oral pass filter 8a, and the oral pass filter 8a removes unnecessary frequency band noise from the first baseband signal (SIG11B).
  • the low-pass filter 8a is connected to the baseband signal amplifier 8b, and the baseband signal amplifier 8b converts the input first baseband signal to the input voltage of the first AZD converter 8c connected to its own subsequent stage. Adjust the level of the first base span signal to match the range.
  • the first AZD converter 8c converts the input first baseband signal from analog to digital, and digitizes the baseband signal to the OFDM demodulator 8d connected to its own stage. Send.
  • the OFDM demodulator 8d demodulates the digitized baseband signal and sends the demodulated broadcast signal to the television receiver.
  • the second received signal (SIG12) distributed from the power distributor 3 is input to the second frequency converter 5a, and the port is adjusted to the frequency band of the received channel input from the local oscillator 7.
  • the one base signal is down-converted into a second baseband signal (SI Gl 2B).
  • the second frequency converter 5a is connected to the low-pass filter 5b, and the low-pass filter 5b is present in the input second baseband signal. It removes noise components including broadcast signals other than the tuned channel, and sends only pure broadcast signals to the RSSI (received signal strength display) circuit 5c connected to the subsequent stage.
  • the RSSI circuit 5c outputs an RSSI current signal according to the power level of the input second baseband signal, and the RSSI output current signal is converted to the RSSI voltage signal by the current-voltage converter 5d connected to the subsequent stage. Convert to The current-to-voltage converter 5d is connected to the second A / D converter 5e, and the second AZD converter 5e converts the RSSI voltage signal from analog to digital and sends it to the control circuit 9. Send the digitized RSSI signal.
  • the control circuit 9 detects the power level of the broadcast signal at the end of the antenna 1 based on the conversion table in which the R SSI signal is stored in the storage circuit 10 in advance. Further, the control circuit 9 controls the gain of the variable gain amplifier 4b and determines the presence / absence of a broadcast wave in accordance with the detected power level at the antenna 1 end, and also controls various settings such as setting the frequency of the local oscillator 7. Controls the function block.
  • the detection circuit 5 When a terminal device equipped with the receiving device according to the first embodiment of the present invention attempts to receive terrestrial digital broadcasting for mobile objects, in the first step S11, the detection circuit 5, the control Power is supplied to the circuit 9 and the storage circuit 10, and no power is supplied to the high-frequency amplifier circuit 4 and the baseband demodulation circuit 8. Since the antenna 1, the bandpass filter 2, and the power divider 3 are passive elements and do not require power supply, the broadcast detection operation functions normally.
  • step S12 initialization is performed to return the number N of detection tests to 0.
  • step S13 power is supplied to the detection circuit 5, the control circuit 9, and the storage circuit 10, and the transmission and reception signals are transmitted. Try to detect.
  • the method of detecting the broadcast signal is based on the power conversion table provided in the storage circuit 10 in advance, and based on the RSSI signal detected by the detection circuit 5,
  • the control circuit 9 detects the received power at the tener 1.
  • step S14 an operation of adding 1 to the number of detection tests N is performed, and the number of detections is counted up.
  • step S15 the control circuit 9 determines whether the received power at the antenna 1 end is equal to or greater than a threshold (for example, equal to or greater than 180 Od Bm). It is determined that the signal can be received, and the process proceeds to step S16. If the received power is less than the threshold, the process proceeds to step S18, and if the number of detection tests N is smaller than the specified number of detection tests A, the broadcast is detected again in step S13 after a predetermined time has elapsed. .
  • a threshold for example, equal to or greater than 180 Od Bm
  • step S19 it is determined that the environment is not in a state where broadcasts can be received, and the detection circuit 5, the control circuit 9, and the storage circuit 1 Stop power supply to 0 and end broadcast detection.
  • the reason why the receiver detects broadcasts multiple times is to cope with cases where the mobile terminal equipped with the receivers cannot be received accidentally due to shadows or obstructions, etc.
  • the detection accuracy of the broadcast signal is improved.
  • step S16 power supply to the high-frequency amplifier circuit 4 and the baseband demodulation circuit 8 is started, and a normal broadcast signal receiving operation is started (step S17).
  • the passive mixer (second frequency converter 5a) that down-converts the high-frequency signal to the baseband signal is provided before the detection circuit, so that only the circuit before the high-frequency amplifier 4 can operate. Detection of received signals becomes possible, and the first frequency converter 6 of the high-frequency amplifier 4 and the demodulation circuit 8 (active mixer: using a transistor, an active element such as an FET (Field Effect Transistor)) It is possible to completely stop the power supply to circuits with large power consumption such as mixers.
  • active mixer using a transistor, an active element such as an FET (Field Effect Transistor)
  • the first frequency converter 6 for down-converting the received signal preferably uses an active mixer to prevent loss of the received signal.
  • the second frequency converter 5a included in the detection circuit 5 since the second frequency converter 5a included in the detection circuit 5 only needs to be able to confirm the presence or absence of a signal, the loss amount (about 7 to 10 dB) of the passive mixer hardly matters.
  • a mixer can be used for the frequency conversion means.
  • the local oscillator 7 included in the detection circuit 5 can be shared with the one used for the first frequency converter 6, there is no need to separately provide a local oscillator. Therefore, it is possible to simultaneously reduce power consumption and determine whether or not to provide a mobile broadcasting service.
  • FIG. 3 is a block diagram showing the configuration of the receiving device according to the second embodiment.
  • the receiver shown in Fig. 3 consists of an antenna 1, a bandpass filter group circuit 22, a power divider 3, a high-frequency amplifier circuit 4, a detection circuit 25, a first frequency converter 6, a local oscillator 7, and a baseband demodulation circuit 8. , A control circuit 29, and a storage circuit 30.
  • the function of each block constituting the receiving apparatus and the processing of a broadcast reception signal will be described.
  • An antenna 1 for receiving terrestrial digital broadcasts for mobile objects is connected to a first high-frequency switch circuit 22a.
  • the first high-frequency switch circuit 22 a performs a path switching operation of a received signal based on a control signal issued from the control circuit 29 in accordance with a frequency band of a broadcast to be received.
  • the function of selecting only one reception channel from a plurality of broadcast channels and detecting the signal strength is based on the frequency of the local oscillator 7 input to the second frequency converter 5a. In the second embodiment, this is realized by switching the band-pass filters (2 2 c 1 to 22 cn) in the band-pass filter group circuit 22.
  • the first high-frequency switch circuit 22a is connected in parallel with n bandpass filters from a bandpass filter (22c1) to a bandpass filter (22cn). N is the number of channels to receive.
  • the other of the n band-pass filters is connected to a second high-frequency switch circuit 22b that performs the same operation as the first high-frequency switch circuit 22a.
  • the wave switch circuit 22a and the second high-frequency switch circuit 22b are provided is that impedance matching with respect to the antenna 1 at the preceding stage and the power divider 3 at the subsequent stage is facilitated, and the signal to a path other than the signal path selected is selected. This is to suppress the wraparound.
  • the other terminal of the second high-frequency switch circuit 22b is a power divider having a function of dividing the broadcast reception signal power into a first reception signal (SIG 21) and a second reception signal (SIG 22). Connected to 3.
  • One of the output terminals of the power divider 3 is connected to the low-noise amplifier 4a to transmit the first received signal (SIG21), and the other output terminal is connected to the RSSI circuit 25c of the detection circuit 25 and Send out the received signal (SI G22).
  • the low-noise amplifier 4a receives the first received signal (S)
  • IG21 is amplified and sent to the variable gain amplifier 4b connected after itself.
  • the variable gain amplifier 4b determines the amount of gain based on the control signal set by the control circuit 29 according to the received signal power strength, and amplifies the power of the input first received signal.
  • the variable gain amplifier 4b is connected to the first frequency converter 6, and the first frequency converter 6 receives a local signal matched to the broadcast frequency band from the local oscillator 7 so that the first The received signal is down-converted to the first baseband signal (SIG21B).
  • the first frequency converter 6 is connected to the low-pass filter 8a, and the single-pass filter 8a removes unnecessary frequency band noise from the input first baseband signal (SIG21B).
  • the low-pass filter 8a is connected to the first baseband signal amplifier 8b, and the baseband signal amplifier 8b converts the input first baseband signal to the first AZD converter 8c connected to the subsequent stage. Adjust the signal level to match the input voltage range.
  • the first AZD converter 8c converts the level-adjusted first baseband signal from analog to digital, and sends the digitized baseband signal to the OFDM demodulator 8d connected to itself.
  • the OFDM demodulator 8d demodulates the digitized baseband signal and sends the demodulated broadcast signal to a television receiver.
  • the second received signal (SIG 2 2) distributed from the power divider 3 is sent to the RSSI circuit 25 c, and the RSSI current signal corresponding to the power level of the second received signal (SIG 2 2) And the RSSI current signal is converted to the RSSI voltage signal by the current-voltage converter 25 d connected to the subsequent stage.
  • the current-to-voltage converter 25 d is connected to the second AZD converter 25 e, which converts the RSSI output voltage signal from analog to digital, Send the RSSI signal after digital conversion to 9.
  • the control circuit 29 detects the power level of the broadcast signal at the end of the antenna 1 based on the conversion table in which the RSSI signal is stored in the storage circuit 30 in advance. In addition, the control circuit 29 controls the gain of the variable gain amplifier 4b and determines the presence or absence of a broadcast wave in accordance with the detected power level at the antenna end, and also sets various functions such as setting the frequency of the local oscillator 7. Is controlled.
  • the method for detecting digital terrestrial broadcasting for mobile objects according to the second embodiment can be performed in the same manner as in the first embodiment shown in FIG.
  • the bandpass filter circuit 22 that transmits only the frequency band of one segment composed of the layers for mobile reception among the broadcast signals in accordance with the number of channels. Since the power supply to the circuits directly related to the demodulation of the received signal after the circuit 4 can be completely stopped, it is possible to simultaneously reduce the power consumption and determine whether or not there is a mobile broadcasting service.
  • FIG. 4 is a block diagram showing a configuration of a receiving apparatus according to the third embodiment
  • FIG. 5 is a flowchart showing a method of detecting a broadcast according to the third embodiment.
  • the receiver shown in Fig. 4 has an antenna 1, a band-pass filter 2, a high-frequency amplifier 34, a detector 35, a first frequency converter 6, a local oscillator 7, a baseband demodulator 38, a control circuit 39, It is composed of a storage circuit 40.
  • the antenna 1 for receiving digital terrestrial broadcasting for mobiles is connected to a bandpass filter 2 with a wide passband characteristic that passes the broadcasting frequency band of all channels, and the bandpass filter 2 is connected to a low noise amplifier 3 4a Have been.
  • the low noise amplifier 34 a selects whether to bypass or amplify the received signal based on the control signal generated from the control circuit 39.
  • the open-ended noise amplifier 34a is connected to the variable gain amplifier 34b, and the variable gain amplifier 34b bypasses or amplifies the received signal based on the control signal generated by the control circuit 39. Select whether to do so.
  • the speech noise amplifier 34a and the variable gain amplifier 34b have a function of bypassing the received signal, and do not perform the amplification operation while the received signal is bypassed. Only a small amount of power consumption is needed to maintain the state of the S (Co-operating metal-oxide semiconductor) switch.
  • the variable gain amplifier 34 b is connected to the first frequency converter 6, and the first frequency converter 6 converts a received signal to a baseband by inputting a local signal matched to a broadcast frequency band from the local oscillator 7. Downconvert to a signal.
  • the first frequency converter 6 is connected to the low-pass filter 8a, and the single-pass filter 8a removes unnecessary frequency band noise from the input baseband signal.
  • the single-pass filter 8a is connected to a power divider 33, and the power divider 33 converts the input baseband signal into a first baseband signal (SIG31B) and a second baseband signal. (SIG32B).
  • One of the divided outputs of the power divider 33 that is, the first baseband signal (SIG31B) is input to the baseband amplifier 8b, and the other distributed output, that is, the second baseband signal (SIG31B). 2B) is input to the RSSI circuit 35c.
  • the baseband signal amplifier 8b converts the first baseband signal (SIG31B) to the input voltage range of the first AZD converter 8c connected to the subsequent stage. Adjust the signal level to.
  • the first A / D converter 8c converts the input first baseband signal from analog to digital, and sends the digitized baseband signal to the OFDM demodulator 8d connected to itself. .
  • the OFDM demodulator 8d demodulates the digitized baseband signal and sends the demodulated emission signal to the television receiver.
  • the second baseband signal After the second baseband signal is input to the RSSI (received signal strength indication) circuit 35c, the second baseband signal outputs an RSSI output signal corresponding to the power level of the second baseband signal, and is provided at a subsequent stage thereof.
  • the connected current-to-voltage converter 35 d converts the RSSI current signal into an RSSI voltage signal.
  • the current-to-voltage converter 35 d is connected to the second AZD converter 35 e, which converts the RSSI output voltage signal from analog to digital, The digitally converted RSSI signal is sent to the control circuit 39.
  • the control circuit 39 detects the power level of the broadcast signal at the end of the antenna 1 based on the conversion table in which the RSSI signal is stored in the storage circuit 40 in advance. Further, the control circuit 39 controls the gain of the variable gain amplifier 34 b and determines the presence / absence of broadcast waves in accordance with the detected power level at the antenna 1 end, and also sets the frequency of the local oscillator 7. Of each function block.
  • a high-frequency amplifier circuit 34 When a terminal device equipped with the receiving device according to the third embodiment of the present invention attempts to receive a terrestrial digital broadcast for a mobile object, in the first step S31, a high-frequency amplifier circuit 34 , The received signal passing through the band-pass filter 2 is directly input to the first frequency converter 6, passes through the single-pass filter 8 a and the power divider 33, and passes through the detection circuit 35. Is supplied with a second baseband signal.
  • step S31 power is supplied to the detection circuit 35, the control circuit 39, the storage circuit 40, the first frequency converter 6, and the local oscillator 7, and the high-frequency amplifier circuit 34 is in the switch state. Only a small amount of power is supplied to save the data, and no power is supplied to the other baseband demodulation circuits 38. Since the antenna 1, the band-pass filter 2, and the power divider 33 are passive elements and do not require power supply, the broadcast detection operation functions normally.
  • the detection circuit 35, the control circuit 39, and the storage circuit 40 are operated to try to detect a broadcast signal.
  • the broadcast signal is detected by the control circuit 39 detecting the received power at the antenna 1 end from the RSSI signal detected by the detection circuit 35 based on a power conversion table provided in the storage circuit 40 in advance. .
  • step S34 an operation of adding 1 to the number N of detection tests is performed, and the number of detection tests is counted up.
  • the control circuit 39 determines whether or not the received power at the antenna end is equal to or greater than a threshold (for example, equal to or greater than 180 dBm). Is determined to be receivable, and the process proceeds to step S36. If the received power is less than the threshold value, the process proceeds to step S38, and if the number of detection tests N is smaller than the specified number of detection tests A, the broadcast is detected again in step S33 after a certain time has elapsed.
  • a threshold for example, equal to or greater than 180 dBm
  • step S39 it is determined that the environment is not in a state where broadcasting can be received, and the detection circuit 35, the control circuit 39, and the storage circuit Stop power supply to 40 and end broadcast detection.
  • step S36 the bypass function of the high-frequency amplifier circuit 34 is released so that the normal reception signal amplification operation is performed, and power supply to the local oscillator 7 and the baseband demodulation circuit 38 is started.
  • step S37 To enter the normal broadcast signal receiving operation (step S37) o
  • the received signal bypasses the high-frequency amplifier circuit 34, so that the power supply of the high-frequency signal can be stopped or reduced to a small amount, so that the power consumption can be reduced and It is possible to simultaneously determine the presence or absence of a broadcast service for broadcasting.
  • the reception operation is started normally by supplying power to the high-frequency amplifier circuit 34.
  • the receiving apparatus uses the direct conversion method in which the frequency band is down-converted directly from a high frequency (RF) signal to a baseband signal.
  • the problem can be solved by using a method of down-converting to an intermediate frequency (IF) signal once.
  • the present invention if the signal detected by the detection circuit is at a level that can be demodulated by the demodulation circuit, power is supplied to the amplification circuit, and there is no signal detected by the detection circuit or demodulation cannot be performed by the demodulation circuit.
  • Control circuit that does not supply power to the amplifier circuit at any level, the power supply to the amplifier circuit, which consumes a large amount of power, can be completely stopped when it is not needed. It is possible to realize a receiving device that can simultaneously determine the presence or absence of a broadcast service for broadcasting.
  • the detection circuit when detecting the presence or absence of broadcasting in a specific narrow frequency band, is provided with frequency conversion means for down-converting a high-frequency signal to an intermediate frequency signal or a baseband signal, so that the signal can be received before the amplifier circuit operates.
  • the signal can be detected, and the power supply to the amplifier circuit can be completely stopped.
  • a high-frequency amplifier circuit is provided by providing, according to the number of channels, a band-pass filter that allows only a frequency band of one segment formed of a layer for mobile reception among broadcast signals to pass therethrough. Since the power supply to circuits directly related to subsequent demodulation of the received signal can be completely stopped, it is possible to simultaneously reduce power consumption and determine whether or not there is a broadcast service for mobiles.
  • the received signal bypasses the amplifier circuit, so that the power supply of the high-frequency signal can be stopped or reduced to a small amount.
  • the receiving operation is started normally by supplying power to the amplifier circuit.
  • the receiving device is suitable for a receiving device such as a portable device that receives a broadcast service signal such as a terrestrial digital broadcast, and can reduce power consumption and determine the presence or absence of a mobile service. .

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Television Receiver Circuits (AREA)

Abstract

A detecting circuit (5), a control circuit (9) and a memory circuit (10) are supplied with power, while a high frequency amplifying circuit (4) and a baseband demodulating circuit (8) are not supplied with power. Based on a power conversion table prepared and stored in the memory circuit (10), the control circuit (9) detects, from an RSSI signal detected by the detecting circuit (5), a reception power at an antenna (1). The control circuit (9) determines whether the reception power at the antenna terminal is greater than a threshold value (e.g., -80dBm). If so, the control circuit (9) judges that the broadcast signal is receivable. If so, supplying power for the high frequency amplifying circuit (4) and baseband demodulating circuit (8) is initiated to enter a normal broadcast signal reception operation.

Description

明 細 書  Specification
技術分野 Technical field
本発明は、 地上波デジタル放送等の放送サービス信号を受信する携帯機器等の 受信装置に関する。 背景技術  The present invention relates to a receiving device such as a portable device for receiving a broadcast service signal such as digital terrestrial broadcasting. Background art
従来から、 地上波のアナログテレビ放送を受信できる移動を前提とした携帯端 末が存在しているが、 伝送方式がマルチパスの影響を受けやすい点やアンテナ等 の受信性能の問題があり、 屋外や移動中の環境下では、 正常な放送受信ができな いことも多かった。  Conventionally, there is a mobile terminal that is assumed to be mobile that can receive terrestrial analog television broadcasting.However, the transmission method is susceptible to multipath, and there are problems with the receiving performance of antennas and other factors, and outdoor In a mobile environment or in a moving environment, normal broadcast reception was not possible in many cases.
前記の課題を解決するために、 近年、 地上波のテレビ放送において、 従来から のアナログ方式に変わる、 OFDM (Orthogonal Frequency DivisionMultiplex： 直交周波数分割多重） 方式を採用した地上波デジタルテレビの実用化が進められ ている。 OF DM方式は、 高速なデータ信号を低速で狭帯域なデータ信号に変換 し、 周波数軸上で並列に伝送することにより、 シンポル長を長くして全体に占め る符号間干渉を小さくすることができるので、 マルチパスによる影響を受けにく く、 移動中に受信しても画面が途切れたりする不具合が少ない等の利点がある。 地上波デジタルテレビ放送では、 図 6 (a) に示すように、 約 6 MHzの伝送 帯域 61を 13個のセグメント 62に分割して、 13個のセグメント全てを 1 チャンネルの HDTV (高品位テレビジョン） あるいは複数チャンネルの SDT V (標準画質テレビジョン）固定受信用に使用する方法がある。さらに、図 6 (b) に示すように 13個のセグメントを最大 3階層に分割して、 固定受信用の階層 6 4, 66のほかに、 移動体受信用の階層 65を設定することが可能である。 変調方式は各階層で任意に決められるので、 移動受信用の階層は電波の受信の 容易性と移動受信装置のシステム負荷軽減のために、 周波数帯の中心に位置するIn order to solve the above-mentioned problems, in recent years, terrestrial digital television broadcasting that adopts OFDM (Orthogonal Frequency Division Multiplex) has been promoted in practical use in terrestrial television broadcasting, replacing conventional analog systems. It has been. The OFDM system converts a high-speed data signal into a low-speed, narrow-band data signal and transmits it in parallel on the frequency axis, thereby shortening the symbol length and reducing intersymbol interference occupying the whole. It has the advantages of being less susceptible to the effects of multipath, and having fewer problems that the screen is interrupted even if it is received while moving. In terrestrial digital television broadcasting, as shown in Fig. 6 (a), a transmission band 61 of about 6 MHz is divided into 13 segments 62, and all 13 segments are converted into one channel of HDTV (high-definition television). Alternatively, there is a method used for fixed reception of multiple channels of SDT V (standard definition television). Furthermore, as shown in Fig. 6 (b), 13 segments can be divided into a maximum of three layers, and in addition to fixed reception layers 64 and 66, mobile reception layer 65 can be set. It is. Since the modulation scheme is arbitrarily determined for each layer, the mobile reception layer is located at the center of the frequency band to facilitate radio wave reception and reduce the system load on the mobile receiver.
1セグメントが割り当てられ、 変調方式も干渉や妨害に強い D Q P S K変調方式 等が使用される。 One segment is allocated, and a DQPSK modulation method that is resistant to interference and interference is used as the modulation method.
このように、 地上波デジタル放送では P D Aや携帯電話等の携帯機器に、 移動 受信用の地上波デジタル放送サービスを受信させる試みが行われている。  As described above, in terrestrial digital broadcasting, attempts are being made to allow mobile devices such as PDAs and mobile phones to receive terrestrial digital broadcasting services for mobile reception.
しかしながら、 移動体向けの地上波デジタル放送は、 視聴需要やメンテナンス 等の関係で、 早朝や深夜は放送サービスを行わない可能性があり、 放送エリア内 であっても、 必ずしも常時放送サービスが受信可能と言うわけではない。  However, terrestrial digital broadcasting for mobiles may not provide broadcasting services early in the morning or late at night due to viewing demand and maintenance, etc., so it is always possible to receive broadcasting services even within the broadcasting area That is not to say.
また、 移動体端末の存在位置は固定されているわけではないので、 移動体端末 が放送サービスのエリア外に出てしまう可能性もある。  Also, since the location of the mobile terminal is not fixed, there is a possibility that the mobile terminal may go out of the broadcasting service area.
このような状況では、放送サービスが時間的、空間的に受信可能かどうかチェッ クする必要がある。 放送サービスの確認方法としては、 移動受信用の階層 6 5の 伝送周波数帯に対してキヤリアセンスを行う方法がある。 キヤリアセンスを備え た受信機の構成例として、 図 7に示すものが知られている。 この受信装置は、 ァ ンテナ 1 0 1、 バンドパスフィルタ 1 0 2、 高周波増幅回路 1 0 4、 検出回路 1 0 5、 局部発振器 1 0 7、 復調回路 1 0 8、 制御回路 1 0 9、 記憶回路 1 1 0か ら構成されている。 復調回路 1 0 8内には周波数変換器 1 0 6と電力分配器 1 0 3が配されている。  In such a situation, it is necessary to check whether the broadcasting service can be received temporally and spatially. As a method of confirming the broadcast service, there is a method of performing carrier sensing on the transmission frequency band of the layer 65 for mobile reception. FIG. 7 shows an example of a configuration of a receiver having a carrier sense. This receiving device includes an antenna 101, a band-pass filter 102, a high-frequency amplifier 104, a detection circuit 105, a local oscillator 107, a demodulation circuit 108, a control circuit 109, and a memory. It consists of a circuit 110. In the demodulation circuit 108, a frequency converter 106 and a power distributor 103 are arranged.
図 7の受信装置は、 電力分配器 1 0 3に接続される検出回路 1 0 5で受信電力 の検出を行うので、 最低でも高周波増幅回路 1 0 4と周波数変換器 1 0 6に常時 電源を供給する必要があり、 携帯端末のように消費電力の抑制を意図した場合に は問題がある。  In the receiver shown in Fig. 7, the detection circuit 105 connected to the power divider 103 detects the received power, so that at least the high-frequency amplifier circuit 104 and the frequency converter 106 always have a power supply. It is necessary to supply power, and there is a problem if the intention is to reduce power consumption like a mobile terminal.
電力分配器 1 0 3と周波数変換器 1 0 6は、 抵抗、 コンデンサ、 コイル、 ダイ オードなどの受動素子であるパッシブ素子を使用することが可能であり、 それ自 体に電源を与える必要がないので電力消費を抑制できるが、 周波数変換器 1 0 6 に該パッシブ素子を使用するパッシブミキサを使用した場合には、 受信信号を周 波数変換する際に受信電力の損失が大きくなるという問題がある。 この場合に、 受信装置を正常に動作させるには受信電力の損失補償が必要であり、 高周波増 器 1 0 4は高いゲインが必要となるので、 電力を余計に消費してしまう。 The power divider 103 and the frequency converter 106 can use passive elements such as resistors, capacitors, coils, and diodes, which are passive elements, and there is no need to supply power to themselves. Therefore, power consumption can be reduced. In the case where a passive mixer using the passive element is used, there is a problem that a loss of received power increases when a received signal is frequency-converted. In this case, in order to operate the receiving device normally, it is necessary to compensate for the loss of the received power, and the high-frequency amplifier 104 requires a high gain, so that the power is excessively consumed.
従って、 本発明の目的は、 上記の課題を鑑み、 低消費電力化と移動体向け放送 サ一ビスの有無の判別が両立可能な受信装置を提供することにある。 発明の開示  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a receiving apparatus capable of achieving both low power consumption and determination of the presence / absence of a broadcasting service for a mobile object in view of the above problems. Disclosure of the invention
前記課題を解決するために、 第 1の発明は、 放送サービス信号を受信する受信 装置において、 受信信号のうち特定の放送周波数帯の信号を検出する検出回路と 、 受信信号を増幅する増幅回路と、 前記増幅回路の増幅信号を復調する復調回路 と、 前記検出回路の検出した信号が前記復調回路で復調可能なレベルであれば、 前記増幅回路に電源を供給し、 前記検出回路の検出した信号がないか、 あるいは 前記復調回路で復調不能なレベルであれば、 前記増幅回路に電源を供給しない制 御回路とを備えたことを特徴とする。  In order to solve the above-mentioned problems, a first invention is a receiving apparatus for receiving a broadcast service signal, comprising: a detection circuit that detects a signal of a specific broadcast frequency band among the received signals; and an amplification circuit that amplifies the received signal. A demodulation circuit that demodulates an amplified signal of the amplification circuit; and a signal detected by the detection circuit, when the signal detected is a level that can be demodulated by the demodulation circuit, supplies power to the amplification circuit, and a signal detected by the detection circuit. Or a control circuit that does not supply power to the amplifier circuit if the demodulation circuit is at a level that cannot be demodulated.
第 2の発明は、 第 1の発明記載の受信装置であって、 前記検出回路は、 前記特 定の放送周波数帯に応じたローカル信号を出力する局部発振手段と、 該ロ一カル 信号に基づいて前記受信信号を前記特定の放送周波数に対応した中間周波数信号 或いはベースバンド信号に変換する周波数変換手段と、 該中間周波数信号或いは 該ベースバンド信号の強度を検出する検出手段を備えたことを特徴とする。 第 3の発明は、 第 2の発明に記載の受信装置であって、 前記検出回路の周波数 変換手段は、 パッシブミキサであることを特徴とする。  A second invention is the receiving device according to the first invention, wherein the detection circuit includes a local oscillation unit that outputs a local signal corresponding to the specific broadcast frequency band, based on the local signal. Frequency converting means for converting the received signal into an intermediate frequency signal or a baseband signal corresponding to the specific broadcast frequency, and detecting means for detecting the intensity of the intermediate frequency signal or the baseband signal. And A third invention is the receiving device according to the second invention, wherein the frequency conversion means of the detection circuit is a passive mixer.
第 4の発明は、 第 1の発明記載の受信装置であって、 前記復調回路は、 前記局 部発振手段が出力するローカル信号に基づいて前記受信信号を前記特定の放送周 波数に対応した中間周波数信号或いはベースバンド信号に変換する周波数変換手 段を備え、 該周波数変換手段は、 アクティブミキサであることを特徴とする請求 項 1に記載の受信装置。 A fourth invention is the receiving device according to the first invention, wherein the demodulation circuit converts the received signal into an intermediate signal corresponding to the specific broadcast frequency based on a local signal output by the local oscillation unit. A frequency conversion means for converting the signal into a frequency signal or a baseband signal, wherein the frequency conversion means is an active mixer. Item 2. The receiving device according to Item 1.
第 5の発明は、 放送サービス信号を受信する受信装置において、 受信信号のう ち特定の放送周波数帯の信号を通すバンドパスフィル夕と、 前記バンドパスフィ ルタを通過した信号を検出する検出回路と、 前記バンドパスフィルタを通過した 信号を増幅する増幅回路と、 前記増幅回路の増幅信号を復調する復調回路と、 前 記検出回路の検出した信号が前記復調回路で復調可能なレベルであれば、 前記増 幅回路に電源を供給し、 前記検出回路の検出した信号がないか、 あるいは前記復 調回路で復調不能なレベルであれば、 前記増幅回路に電源を供給しない制御手段 とを備えたことを特徴とする。  According to a fifth aspect of the present invention, in the receiving apparatus for receiving a broadcast service signal, a bandpass filter for passing a signal of a specific broadcast frequency band out of the received signal, and a detection circuit for detecting a signal passing through the bandpass filter An amplifier circuit for amplifying the signal passed through the band-pass filter; a demodulation circuit for demodulating the amplified signal of the amplifier circuit; and a signal detected by the detection circuit as long as the signal can be demodulated by the demodulation circuit. Control means for supplying power to the amplification circuit, and not supplying power to the amplification circuit if there is no signal detected by the detection circuit or if the level cannot be demodulated by the demodulation circuit. It is characterized by the following.
第 6の発明は、 第 5の発明記載の受信機であって、 前記バンドパスフィルタは 、 1つの放送チャンネルの周波数帯のみを通すフィルタが、 受信する放送チャン ネル数だけ設けられており、 さらに、 前記バンドパスフィルタを通過する信号の うち特定の放送チヤンネルの周波数帯の信号を選択するスィツチを設けたことを 特徴とする。  A sixth invention is the receiver according to the fifth invention, wherein the band-pass filter is provided with filters that pass only the frequency band of one broadcast channel by the number of broadcast channels to be received. A switch for selecting a signal in a frequency band of a specific broadcast channel from among the signals passing through the band-pass filter is provided.
第 7の発明は、 放送サービスの信号を受信する受信装置において、 受信信号を 増幅する機能と、 受信信号をバイパスする機能を切り換え可能な増幅回路と、 バ ィパスされた受信信号のうち特定の放送周波数帯の信号を検出する検出回路と、 前記増幅回路の増幅信号を復調する復調回路と、 受信信号を前記増幅回路にバイ パスさせて前記検出回路に検出させ、 前記検出回路の検出信号が前記復調回路で 復調可能なレベルの場合のみ、 前記増幅回路に受信信号を増幅させる制御回路と を備えたことを特徴とする。  A seventh invention is a receiving apparatus for receiving a signal of a broadcast service, wherein the function of amplifying the received signal, an amplifying circuit capable of switching a function of bypassing the received signal, and a specific broadcast signal of the bypassed received signal are provided. A detection circuit that detects a signal in a frequency band; a demodulation circuit that demodulates an amplified signal of the amplification circuit; a detection signal that bypasses the amplification circuit and is detected by the detection circuit; A control circuit for amplifying the received signal by the amplifying circuit only when the demodulation circuit can demodulate the signal.
本発明においては、 増幅回路が機能する前に、 検出回路で検出した受信信号の レベルから復調可能であれば、 増幅回路を機能させるようにしたので、 低消費電 力化と、 移動体向け放送サービスの有無の判断が同時に可能になる。 図面の簡単な説明 図 1は、 第 1の実施の形態に係わる受信装置の構成を示すブロック図である。 図 2は、 第 1の実施の形態及び第 2の実施の形態に係わる受信装置の動作を示 す流れ図である。 In the present invention, if the demodulation can be performed from the level of the received signal detected by the detection circuit before the amplification circuit functions, the amplification circuit is made to function. It is possible to simultaneously determine the presence or absence of a service. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a block diagram illustrating a configuration of a receiving apparatus according to the first embodiment. FIG. 2 is a flowchart showing the operation of the receiving apparatus according to the first embodiment and the second embodiment.
図 3は、 第 2の実施の形態に係わる受信装置の構成を示すプロック図である。 図 4は、 第 3の実施の形態に係わる受信装置の構成を示すプロック図である。 図 5は、 第 3の実施の形態に係わる受信装置の動作を示す流れ図である。  FIG. 3 is a block diagram showing a configuration of a receiving apparatus according to the second embodiment. FIG. 4 is a block diagram illustrating a configuration of a receiving device according to the third embodiment. FIG. 5 is a flowchart showing an operation of the receiving apparatus according to the third embodiment.
図 6は、 移動体端末向けの地上波デジタルテレビの放送電波を説明した図であ る。  FIG. 6 is a diagram illustrating broadcast waves of a terrestrial digital TV for mobile terminals.
図 7は、 従来の受信装置の一例を示した図である。 発明を実施するための最良の形態  FIG. 7 is a diagram illustrating an example of a conventional receiving apparatus. BEST MODE FOR CARRYING OUT THE INVENTION
以下に、 本発明の実施の形態について図面を参照しながら説明する。  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
ぐ第 1の実施の形態 > First Embodiment>
図 1は第 1の実施の形態に係わる受信装置の構成を示すプロック図であり、 図 2は第 1の実施の形態に係わる放送の検出の方法を示した流れ図である。  FIG. 1 is a block diagram showing a configuration of a receiving apparatus according to the first embodiment, and FIG. 2 is a flowchart showing a method of detecting a broadcast according to the first embodiment.
図 1の受信装置は、 アンテナ 1、 バンドパスフィルタ 2、 電力分配器 3、 高周 波増幅回路 4、 検出回路 5、 第 1の周波数変換器 6、 ベースバンド復調回路 8、 制御回路 9、 記憶回路 1 0で構成されている。 検出回路 5は局部発振器 7で構成 される局部発振手段と、 検出回路 5内のその他の機能ブロック 1 1で構成される 検出手段を備えている。 また局部発振器 7は第 1の周波数変換器 6への口一カル 信号の供給機能も備えている。  The receiver shown in Fig. 1 has an antenna 1, a bandpass filter 2, a power divider 3, a high-frequency amplifier 4, a detector 5, a first frequency converter 6, a baseband demodulator 8, a control circuit 9, and a memory. It is composed of a circuit 10. The detection circuit 5 includes a local oscillation unit configured by a local oscillator 7 and a detection unit configured by other functional blocks 11 in the detection circuit 5. The local oscillator 7 also has a function of supplying a local signal to the first frequency converter 6.
次に、 受信装置を構成する各ブロックの機能と放送の受信信号の処理について 説明する。  Next, the function of each block constituting the receiving apparatus and the processing of a broadcast reception signal will be described.
移動体向け地上波デジタル放送を受信するアンテナ 1は、 全てのチャンネルの 放送周波数帯を通過させる広い通過帯域特性のバンドパスフィルタ 2に接続され、 バンドパスフィルタ 2は電力分配器 3に接続されている。 電力分配器 3は口一ノ ィズアンプ （LNA) 4 aと第 2の周波数変換器 5 aに接続され、 放送の受信信 号電力を第 1の受信信号 （S I G1 1) と第 2の受信信号 （S I G12) に分割 する機能を有している。 第 1の受信信号 （S I G11) はローノイズアンプ 4 a に入力され、 ローノイズアンプ 4 aが有する一定の利得分だけ増幅される。 口一 ノイズアンプ 4 aは可変利得増幅器 4 bに接続され、 可変利得増幅器 4 bは制御 回路 9が受信信号電力に応じて設定する利得分の電力増幅を入力した第 1の受信 信号の対して行う。 The antenna 1 for receiving terrestrial digital broadcasting for mobiles is connected to a bandpass filter 2 with a wide passband characteristic that allows the broadcast frequency band of all channels to pass, and the bandpass filter 2 is connected to a power divider 3 I have. Power distributor 3 Connected to the amplifier (LNA) 4a and the second frequency converter 5a to divide the broadcast received signal power into the first received signal (SI G11) and the second received signal (SI G12) have. The first received signal (SIG11) is input to the low noise amplifier 4a and is amplified by a certain gain of the low noise amplifier 4a. The noise amplifier 4a is connected to the variable gain amplifier 4b, and the variable gain amplifier 4b receives the power amplification corresponding to the gain set by the control circuit 9 according to the received signal power. Do.
可変利得増幅器 4 bは第 1の周波数変換器 6に接続され、 第 1の周波数変換器 6は、 放送周波数帯に応じたローカル信号を局部発振器 7から入力することによ り、 入力した第 1の受信信号を第 1のベースバンド信号 （S I G11 B) にダウ ンコンバートする。 第 1の周波数変換器 6は口一パスフィル夕 8 aに接続され、 口一パスフィル夕 8 aは第 1のベースバンド信号 （S I G11 B) から不要な周 波数帯のノイズを除去する。  The variable gain amplifier 4b is connected to the first frequency converter 6, and the first frequency converter 6 receives a local signal corresponding to a broadcast frequency band from the local oscillator 7 to thereby input the first input signal. Down converted to the first baseband signal (SIG11B). The first frequency converter 6 is connected to the oral pass filter 8a, and the oral pass filter 8a removes unnecessary frequency band noise from the first baseband signal (SIG11B).
ローパスフィルタ 8 aは、 ベースバンド信号増幅器 8 bに接続され、 ベースバ ンド信号増幅器 8 bは入力した第 1のベースバンド信号を自身の後段に接続され る第 1の AZD変換器 8 cの入力電圧範囲に適合するように第 1のべ一スパンド 信号のレベルを調整する。 第 1の AZD変換器 8 cは入力した第 1のべ一スパン ド信号をアナログからデジ夕 こ変換して、 自身の後段に接続される OF DM復 調器 8 dにデジタル化したベースバンド信号を送る。 OF DM復調器 8 dはデジ タル化したベースバンド信号の復調を行い、 テレビ受像器に復調した放送信号を 送る。  The low-pass filter 8a is connected to the baseband signal amplifier 8b, and the baseband signal amplifier 8b converts the input first baseband signal to the input voltage of the first AZD converter 8c connected to its own subsequent stage. Adjust the level of the first base span signal to match the range. The first AZD converter 8c converts the input first baseband signal from analog to digital, and digitizes the baseband signal to the OFDM demodulator 8d connected to its own stage. Send. The OFDM demodulator 8d demodulates the digitized baseband signal and sends the demodulated broadcast signal to the television receiver.
一方、 電力分配器 3から分配される第 2の受信信号 （S I G12) は、 第 2の 周波数変換器 5 aに入力され、 局部発振器 7から入力する受信したチャネルの周 波数帯に合わせた口一カル信号により、第 2のベースバンド信号（S I Gl 2B) にダウンコンバートされる。 第 2の周波数変換器 5 aはローパスフィルタ 5 bに 接続され、 ローパスフィルタ 5 bは入力した第 2のベースバンド信号中に存在す る同調したチャンネル以外の放送信号を含んだノイズ成分を除去し、 純粋な放送 信号のみを自身の後段に接続される R S S I (受信信号強度表示） 回路 5 cに送 る。 On the other hand, the second received signal (SIG12) distributed from the power distributor 3 is input to the second frequency converter 5a, and the port is adjusted to the frequency band of the received channel input from the local oscillator 7. The one base signal is down-converted into a second baseband signal (SI Gl 2B). The second frequency converter 5a is connected to the low-pass filter 5b, and the low-pass filter 5b is present in the input second baseband signal. It removes noise components including broadcast signals other than the tuned channel, and sends only pure broadcast signals to the RSSI (received signal strength display) circuit 5c connected to the subsequent stage.
R S S I回路 5 cは、 入力した第 2のベースバンド信号の電力レベルに応じた R S S I電流信号を出力し、自身の後段に接続される電流電圧変換器 5 dにより、 R S S I出力電流信号を R S S I電圧信号に変換する。 電流電圧変換器 5 dは第 2の A/D変換器 5 eに接続しており、 第 2の AZD変換器 5 eは、 R S S I電 圧信号をアナログからデジタルに変換して、 制御回路 9にデジタル化した R S S I信号を送る。  The RSSI circuit 5c outputs an RSSI current signal according to the power level of the input second baseband signal, and the RSSI output current signal is converted to the RSSI voltage signal by the current-voltage converter 5d connected to the subsequent stage. Convert to The current-to-voltage converter 5d is connected to the second A / D converter 5e, and the second AZD converter 5e converts the RSSI voltage signal from analog to digital and sends it to the control circuit 9. Send the digitized RSSI signal.
制御回路 9は、 前記 R S S I信号を記憶回路 1 0にあらかじめ記憶させておい た変換テーブルに基づいて、アンテナ 1端での放送信号の電力レベルを検出する。 さらに、 制御回路 9は検出したァンテナ 1端での電力レベルに応じて可変利得増 幅器 4 bのゲイン制御や放送電波の有無の判断を行う他に、 局部発振器 7の周波 数設定等の各機能プロックに対する制御を行う。  The control circuit 9 detects the power level of the broadcast signal at the end of the antenna 1 based on the conversion table in which the R SSI signal is stored in the storage circuit 10 in advance. Further, the control circuit 9 controls the gain of the variable gain amplifier 4b and determines the presence / absence of a broadcast wave in accordance with the detected power level at the antenna 1 end, and also controls various settings such as setting the frequency of the local oscillator 7. Controls the function block.
次に、 移動体向け地上波デジタル放送の検出の方法について、 主に図 2を用い て説明する。  Next, a method for detecting digital terrestrial broadcasting for mobile objects will be described mainly with reference to FIG.
本発明の第 1の実施の形態の受信装置を搭載した端末機器が、 移動体向け地上 波デジタル放送の受信を試みようとした場合に、 最初のステップ S 1 1では、 検 出回路 5、制御回路 9、記憶回路 1 0に電源供給を行い、高周波増幅回路 4、ベー スバンド復調回路 8には電源供給を行わない。 アンテナ 1、 バンドパスフィルタ 2、電力分配器 3については、パッシブ素子であり電源供給を必要としないので、 前記放送の検出動作は正常に機能する。  When a terminal device equipped with the receiving device according to the first embodiment of the present invention attempts to receive terrestrial digital broadcasting for mobile objects, in the first step S11, the detection circuit 5, the control Power is supplied to the circuit 9 and the storage circuit 10, and no power is supplied to the high-frequency amplifier circuit 4 and the baseband demodulation circuit 8. Since the antenna 1, the bandpass filter 2, and the power divider 3 are passive elements and do not require power supply, the broadcast detection operation functions normally.
次のステップ S 1 2で、 検出テスト回数 Nを 0に戻す初期設定を行い、 ステツ プ S 1 3で、 検出回路 5、 制御回路 9、 記憶回路 1 0に電源を供給して、 放送信 号の検出を試みる。 放送信号の検出の方法は、 記憶回路 1 0にあらかじめ備えら れた電力変換テーブルに基づいて、 検出回路 5で検出した R S S I信号よりアン テナ 1での受信電力を制御回路 9が検出する。 In the next step S12, initialization is performed to return the number N of detection tests to 0.In step S13, power is supplied to the detection circuit 5, the control circuit 9, and the storage circuit 10, and the transmission and reception signals are transmitted. Try to detect. The method of detecting the broadcast signal is based on the power conversion table provided in the storage circuit 10 in advance, and based on the RSSI signal detected by the detection circuit 5, The control circuit 9 detects the received power at the tener 1.
ステップ S 1 4では、 検出テスト回数 Nに 1を加える操作を行って、 検出回数 をカウントアップする。 ステップ S 1 5では、 制御回路 9はアンテナ 1端での受 信電力が閾値以上 （例えば一 8 O d Bm以上か） であるかどうかを判定し、 前記 受信電力が閾値以上であれば、 放送信号が受信可能であると判断してステップ S 1 6に進む。 前記受信電力が閾値未満であれば、 ステップ S 1 8に進み、 検出テ スト回数 Nが規定の検出テスト回数 Aより小さい場合は、 一定時間経過後にス テツプ S 1 3で再び放送の検出を試みる。  In step S14, an operation of adding 1 to the number of detection tests N is performed, and the number of detections is counted up. In step S15, the control circuit 9 determines whether the received power at the antenna 1 end is equal to or greater than a threshold (for example, equal to or greater than 180 Od Bm). It is determined that the signal can be received, and the process proceeds to step S16. If the received power is less than the threshold, the process proceeds to step S18, and if the number of detection tests N is smaller than the specified number of detection tests A, the broadcast is detected again in step S13 after a predetermined time has elapsed. .
もし、 検出テスト回数 Nが規定の検出テスト回数 Aと等しくなつた場合はス テツプ S 1 9で、 放送を受信できる環境にないと判断して、 検出回路 5、 制御回 路 9、 記憶回路 1 0への電源供給を停止して、 放送の検出を終了する。 放送の検 出を受信装置が複数回行うのは、 受信装置を搭載した移動体端末が、 物陰や遮蔽 物の影響でたまたま受信できない場合等に対処したものであり、 複数回受信を試 みれば、 放送信号の検出精度が向上する。  If the number N of detection tests is equal to the specified number A of detection tests, in step S19, it is determined that the environment is not in a state where broadcasts can be received, and the detection circuit 5, the control circuit 9, and the storage circuit 1 Stop power supply to 0 and end broadcast detection. The reason why the receiver detects broadcasts multiple times is to cope with cases where the mobile terminal equipped with the receivers cannot be received accidentally due to shadows or obstructions, etc. The detection accuracy of the broadcast signal is improved.
ステップ S 1 6では、 高周波増幅回路 4、 ベースバンド復調回路 8に電源の供 給を開始して、 通常の放送信号受信動作に入る （ステップ S 1 7 )。  In step S16, power supply to the high-frequency amplifier circuit 4 and the baseband demodulation circuit 8 is started, and a normal broadcast signal receiving operation is started (step S17).
このように、 検出回路の前段に高周波信号をベースバンド信号にダウンコン バートするパッシブミキサ （第 2の周波数変換器 5 a ) を設けたことにより、 高 周波増幅回路 4より前段の回路のみの動作で受信信号の検出が可能になり、 高周 波増幅器 4、 復調回路 8の第 1の周波数変換器 6 (アクティブミキサ： トランジ ス夕、 F E T (Field Ef fect Trans is tor) などの能動素子を用いたミキサ） 等の 消費電力が大きい回路の電源供給を完全に停止することができる。  In this way, the passive mixer (second frequency converter 5a) that down-converts the high-frequency signal to the baseband signal is provided before the detection circuit, so that only the circuit before the high-frequency amplifier 4 can operate. Detection of received signals becomes possible, and the first frequency converter 6 of the high-frequency amplifier 4 and the demodulation circuit 8 (active mixer: using a transistor, an active element such as an FET (Field Effect Transistor)) It is possible to completely stop the power supply to circuits with large power consumption such as mixers.
ここで、 受信信号をダウンコンバートする第 1の周波数変換器 6は受信信号の 損失を防ぐためにアクティブミキザの使用が望ましい。 一方、 検出回路 5に含ま れる第 2の周波数変換器 5 aは、 信号の有無が確認できれば良いのでパッシブミ キサの損失量 （7〜1 0 d B程度） はほとんど問題にならないので、 パッシブミ キサを周波数変換手段に使用できる。 また、 検出回路 5に含まれる局部発振器 7 は、 第 1の周波数変換器 6に使用するものと共用できるので、 別に局部発振手段 を設ける必要性はない。 ゆえに、 低消費電力化と、 移動体向け放送サービスの有 無の判断が同時に可能になる。 Here, the first frequency converter 6 for down-converting the received signal preferably uses an active mixer to prevent loss of the received signal. On the other hand, since the second frequency converter 5a included in the detection circuit 5 only needs to be able to confirm the presence or absence of a signal, the loss amount (about 7 to 10 dB) of the passive mixer hardly matters. A mixer can be used for the frequency conversion means. In addition, since the local oscillator 7 included in the detection circuit 5 can be shared with the one used for the first frequency converter 6, there is no need to separately provide a local oscillator. Therefore, it is possible to simultaneously reduce power consumption and determine whether or not to provide a mobile broadcasting service.
<第 2の実施の形態 > <Second embodiment>
図 3は第 2の実施の形態に係わる受信装置の構成を示すプロック図である。 図 3の受信装置は、 アンテナ 1、 バンドパスフィルタ群回路 2 2、 電力分配器 3、 高周波増幅回路 4、 検出回路 2 5、 第 1の周波数変換器 6、 局部発振器 7、 ベースバンド復調回路 8、 制御回路 2 9、 記憶回路 3 0で構成されている。 次に、 受信装置を構成する各ブロックの機能と放送の受信信号の処理について 説明する。  FIG. 3 is a block diagram showing the configuration of the receiving device according to the second embodiment. The receiver shown in Fig. 3 consists of an antenna 1, a bandpass filter group circuit 22, a power divider 3, a high-frequency amplifier circuit 4, a detection circuit 25, a first frequency converter 6, a local oscillator 7, and a baseband demodulation circuit 8. , A control circuit 29, and a storage circuit 30. Next, the function of each block constituting the receiving apparatus and the processing of a broadcast reception signal will be described.
移動体向け地上波デジタル放送を受信するアンテナ 1は、 第 1の高周波スィッ チ回路 2 2 aに接続されている。 第 1の高周波スィッチ回路 2 2 aは、 制御回路 2 9より発する制御信号に基づいて、 受信する放送の周波数帯に応じて、 受信信 号の経路切り替え動作を行う。  An antenna 1 for receiving terrestrial digital broadcasts for mobile objects is connected to a first high-frequency switch circuit 22a. The first high-frequency switch circuit 22 a performs a path switching operation of a received signal based on a control signal issued from the control circuit 29 in accordance with a frequency band of a broadcast to be received.
複数の放送チャンネルから 1つの受信チャンネルのみを選択して、 信号強度を 検出するための機能は、 第 1の実施の形態では第 2の周波数変換器 5 aに入力す る局部発振器 7の周波数を変えることにより実現しているが、 第 2の実施の形態 ではバンドパスフィルタ群回路 2 2中のバンドパスフィル夕 （2 2 c 1から 2 2 c n ) を切り換えることにより実現している。  In the first embodiment, the function of selecting only one reception channel from a plurality of broadcast channels and detecting the signal strength is based on the frequency of the local oscillator 7 input to the second frequency converter 5a. In the second embodiment, this is realized by switching the band-pass filters (2 2 c 1 to 22 cn) in the band-pass filter group circuit 22.
第 1の高周波スィッチ回路 2 2 aには、 バンドパスフィルタ （2 2 c 1 ) から バンドパスフィルタ （2 2 c n ) の n個のバンドパスフィル夕が並列に接続され ている。 前記 nは受信するチャンネル数である。 前記 n個のバンドパスフィルタ のもう一方は、 第 1の高周波スィッチ回路 2 2 aと同様の動作を行う第 2の高周 波スィッチ回路 2 2 bに接続されている。  The first high-frequency switch circuit 22a is connected in parallel with n bandpass filters from a bandpass filter (22c1) to a bandpass filter (22cn). N is the number of channels to receive. The other of the n band-pass filters is connected to a second high-frequency switch circuit 22b that performs the same operation as the first high-frequency switch circuit 22a.
ここで、 前記バンドパスフィルタ （2 2 c l〜2 2 c n) の前後に第 1の高周 波スィッチ回路 22 aおよび第 2の高周波スィッチ回路 22 bを設けた理由は、 前段のアンテナ 1と後段の電力分配器 3に対するインピーダンス整合を容易にし、 力 選択された信号経路以外の経路への信号の回り込みを抑制するためである。 第 2の高周波スィッチ回路 22 bのもう一方の端子は、 放送の受信信号電力を 第 1の受信信号 （ S I G 21 ) と第 2の受信信号 （ S I G 22 ) に分割する機能 を備えた電力分配器 3に接続されている。 電力分配器 3の出力端子の一方はロー ノイズアンプ 4 aに接続され第 1の受信信号 （S I G21) を送出し、 もう一方 の出力端子は検出回路 25の RSS I回路 25 cに接続され第 2の受信信号 （S I G22) を送出する。 Here, before and after the bandpass filter (22 cl to 22 cn), the first high frequency The reason why the wave switch circuit 22a and the second high-frequency switch circuit 22b are provided is that impedance matching with respect to the antenna 1 at the preceding stage and the power divider 3 at the subsequent stage is facilitated, and the signal to a path other than the signal path selected is selected. This is to suppress the wraparound. The other terminal of the second high-frequency switch circuit 22b is a power divider having a function of dividing the broadcast reception signal power into a first reception signal (SIG 21) and a second reception signal (SIG 22). Connected to 3. One of the output terminals of the power divider 3 is connected to the low-noise amplifier 4a to transmit the first received signal (SIG21), and the other output terminal is connected to the RSSI circuit 25c of the detection circuit 25 and Send out the received signal (SI G22).
ローノイズアンプ 4 aは、 自身が有する一定の利得分だけ第 1の受信信号 （S The low-noise amplifier 4a receives the first received signal (S
I G21) を増幅し、 自身の後段に接続されている可変利得増幅器 4bに送る。 可変利得増幅器 4 bは、 制御回路 29が受信信号電力強度に応じて設定する制御 信号に基づいて利得量を決定し、 入力した第 1の受信信号の電力増幅を行う。 可変利得増幅器 4 bは第 1の周波数変換器 6に接続され、 第 1の周波数変換器 6は、 放送周波数帯に合わせたローカル信号を局部発振器 7から入力することに より、 入力した第 1の受信信号を第 1のべ一スバンド信号 （S I G21B) にダ ゥンコンバートする。第 1の周波数変換器 6はローパスフィル夕 8 aに接続され、 口一パスフィルタ 8 aは入力した第 1のベースバンド信号 （S I G21B) から 不要な周波数帯のノィズを除去する。 IG21) is amplified and sent to the variable gain amplifier 4b connected after itself. The variable gain amplifier 4b determines the amount of gain based on the control signal set by the control circuit 29 according to the received signal power strength, and amplifies the power of the input first received signal. The variable gain amplifier 4b is connected to the first frequency converter 6, and the first frequency converter 6 receives a local signal matched to the broadcast frequency band from the local oscillator 7 so that the first The received signal is down-converted to the first baseband signal (SIG21B). The first frequency converter 6 is connected to the low-pass filter 8a, and the single-pass filter 8a removes unnecessary frequency band noise from the input first baseband signal (SIG21B).
ローパスフィルタ 8 aは、第 1のベースバンド信号増幅器 8 bに接続され、ベー スバンド信号増幅器 8 bは入力した第 1のベースバンド信号を自身の後段に接続 される第 1の AZD変換器 8 cの入力電圧範囲に適合するように信号レベルを調 整する。 第 1の AZD変換器 8 cはレベル調整された第 1のベースバンド信号を アナログからデジタルに変換して、 自身の後段に接続される OFDM復調器 8 d にデジタル化したベースバンド信号を送る。 OF DM復調器 8 dはデジタル化し たベースバンド信号の復調を行い、 テレビ受像器に復調した放送信号を送る。 一方、 電力分配器 3から分配される第 2の受信信号 （S I G 2 2 ) は、 R S S I回路 2 5 cに送られ、 第 2の受信信号 （S I G 2 2 ) の電力レベルに応じた R S S I電流信号を出力し、自身の後段に接続される電流電圧変換器 2 5 dにより、 R S S I電流信号を R S S I電圧信号に変換する。 電流電圧変換器 2 5 dは第 2 の AZD変換器 2 5 eに接続しており、 第 2の AZD変換器 2 5 eは、 R S S I 出力電圧信号をアナログからデジタルに変換して、 制御回路 2 9にデジタル変換 後の R S S I信号を送る。 The low-pass filter 8a is connected to the first baseband signal amplifier 8b, and the baseband signal amplifier 8b converts the input first baseband signal to the first AZD converter 8c connected to the subsequent stage. Adjust the signal level to match the input voltage range. The first AZD converter 8c converts the level-adjusted first baseband signal from analog to digital, and sends the digitized baseband signal to the OFDM demodulator 8d connected to itself. The OFDM demodulator 8d demodulates the digitized baseband signal and sends the demodulated broadcast signal to a television receiver. On the other hand, the second received signal (SIG 2 2) distributed from the power divider 3 is sent to the RSSI circuit 25 c, and the RSSI current signal corresponding to the power level of the second received signal (SIG 2 2) And the RSSI current signal is converted to the RSSI voltage signal by the current-voltage converter 25 d connected to the subsequent stage. The current-to-voltage converter 25 d is connected to the second AZD converter 25 e, which converts the RSSI output voltage signal from analog to digital, Send the RSSI signal after digital conversion to 9.
制御回路 2 9は、 前記 R S S I信号を記憶回路 3 0にあらかじめ記億させてお いた変換テーブルに基づいて、 アンテナ 1端での放送信号の電力レベルを検出す る。 さらに、 制御回路 2 9は検出したアンテナ端での電力レベルに応じて可変利 得増幅器 4 bのゲイン制御や放送電波の有無の判断を行う他に、 局部発振器 7の 周波数設定等の各機能ブロックに対する制御を行う。  The control circuit 29 detects the power level of the broadcast signal at the end of the antenna 1 based on the conversion table in which the RSSI signal is stored in the storage circuit 30 in advance. In addition, the control circuit 29 controls the gain of the variable gain amplifier 4b and determines the presence or absence of a broadcast wave in accordance with the detected power level at the antenna end, and also sets various functions such as setting the frequency of the local oscillator 7. Is controlled.
第 2の実施の形態の移動体向け地上波デジタル放送の検出の方法は、 図 2に示 す第 1の実施の形態と同様の方法で可能である。  The method for detecting digital terrestrial broadcasting for mobile objects according to the second embodiment can be performed in the same manner as in the first embodiment shown in FIG.
このように、 放送信号のうち、 移動体受信用の階層で構成された 1つのセグメ ントの周波数帯のみを通過させるバンドパスフィル夕群回路 2 2をチャンネル数 に応じて備えることにより、 高周波増幅回路 4以降の受信信号の復調に直接関係 する回路の電源供給を完全に停止することができるので、 低消費電力化と、 移動 体向け放送サービスの有無の判断が同時に可能となる。  In this way, by providing the bandpass filter circuit 22 that transmits only the frequency band of one segment composed of the layers for mobile reception among the broadcast signals in accordance with the number of channels, high-frequency amplification is achieved. Since the power supply to the circuits directly related to the demodulation of the received signal after the circuit 4 can be completely stopped, it is possible to simultaneously reduce the power consumption and determine whether or not there is a mobile broadcasting service.
<第 3の実施の形態 > <Third embodiment>
図 4は第 3の実施の形態に係わる受信装置の構成を示すプロック図であり、 図 5は第 3の実施の形態に係わる放送の検出の方法を示した流れ図である。  FIG. 4 is a block diagram showing a configuration of a receiving apparatus according to the third embodiment, and FIG. 5 is a flowchart showing a method of detecting a broadcast according to the third embodiment.
図 4の受信装置は、アンテナ 1、バンドパスフィルタ 2、高周波増幅回路 3 4、 検出回路 3 5、 第 1の周波数変換器 6、 局部発振器 7、 ベースバンド復調回路 3 8、 制御回路 3 9、 記憶回路 4 0で構成されている。  The receiver shown in Fig. 4 has an antenna 1, a band-pass filter 2, a high-frequency amplifier 34, a detector 35, a first frequency converter 6, a local oscillator 7, a baseband demodulator 38, a control circuit 39, It is composed of a storage circuit 40.
次に、 受信装置を構成する各ブロックの機能と放送の受信信号の処理について 説明する。 Next, the function of each block constituting the receiving device and the processing of the broadcast received signal explain.
移動体向け地上波デジタル放送を受信するアンテナ 1は、 全てのチヤンネルの 放送周波数帯を通過させる広い通過帯域特性のバンドパスフィルタ 2に接続され、 バンドパスフィル夕 2はローノイズアンプ 3 4 aに接続されている。 ローノイズ アンプ 3 4 aは、 制御回路 3 9より発する制御信号に基づいて、 受信信号をバイ パスするか、 あるいは増幅するかが選択される。 口一ノイズアンプ 3 4 aは可変 利得増幅器 3 4 bに接続され、 可変利得増幅器 3 4 bは、 制御回路 3 9より発す る制御信号に基づいて、 受信信号をバイパスするか、 あるいはどの程度増幅する かを選択する。  The antenna 1 for receiving digital terrestrial broadcasting for mobiles is connected to a bandpass filter 2 with a wide passband characteristic that passes the broadcasting frequency band of all channels, and the bandpass filter 2 is connected to a low noise amplifier 3 4a Have been. The low noise amplifier 34 a selects whether to bypass or amplify the received signal based on the control signal generated from the control circuit 39. The open-ended noise amplifier 34a is connected to the variable gain amplifier 34b, and the variable gain amplifier 34b bypasses or amplifies the received signal based on the control signal generated by the control circuit 39. Select whether to do so.
ここで、 口一ノイズアンプ 3 4 aおよび可変利得増幅器 3 4 bは受信信号をバ ィパスする機能を有し、 受信信号をバイパスしている間は、 増幅動作を行わない ので、 C— M〇S (Co即 lementary- Metal Oxide Semiconductor)スィッチの状態を 保持するだけの微少な電力消費で済む。  Here, the speech noise amplifier 34a and the variable gain amplifier 34b have a function of bypassing the received signal, and do not perform the amplification operation while the received signal is bypassed. Only a small amount of power consumption is needed to maintain the state of the S (Co-operating metal-oxide semiconductor) switch.
可変利得増幅器 3 4 bは第 1の周波数変換器 6に接続され、 第 1の周波数変換 器 6は、 放送周波数帯に合わせたローカル信号を局部発振器 7から入力すること により、 受信信号をベースバンド信号にダウンコンバートする。 第 1の周波数変 換器 6はローパスフィル夕 8 aに接続され、 口一パスフィルタ 8 aは入力した ベースバンド信号から不要な周波数帯のノイズを除去する。  The variable gain amplifier 34 b is connected to the first frequency converter 6, and the first frequency converter 6 converts a received signal to a baseband by inputting a local signal matched to a broadcast frequency band from the local oscillator 7. Downconvert to a signal. The first frequency converter 6 is connected to the low-pass filter 8a, and the single-pass filter 8a removes unnecessary frequency band noise from the input baseband signal.
口一パスフィルタ 8 aは電力分配器 3 3に接続され、 電力分配器 3 3は入力し た前記ベースバンド信号を第 1のベースバンド信号（S I G 3 1 B)と第 2のべ一 スバンド信号 （S I G 3 2 B) に分配する。 電力分配器 3 3の一方の分配出力、 即ち第 1のベースバンド信号 （S I G 3 1 B) はベースバンド増幅器 8 bに入力 され、 もう一方の分配出力、 即ち第 2のベースバンド信号 （S I G 3 2 B) は R S S I回路 3 5 cに入力される。  The single-pass filter 8a is connected to a power divider 33, and the power divider 33 converts the input baseband signal into a first baseband signal (SIG31B) and a second baseband signal. (SIG32B). One of the divided outputs of the power divider 33, that is, the first baseband signal (SIG31B) is input to the baseband amplifier 8b, and the other distributed output, that is, the second baseband signal (SIG31B). 2B) is input to the RSSI circuit 35c.
ベースバンド信号増幅器 8 bは、 第 1のベースバンド信号 （S I G 3 1 B) を 自身の後段に接続される第 1の AZD変換器 8 cの入力電圧範囲に適合するよう に信号レベルを調整する。 第 1の A/D変換器 8 cは、 入力した第 1のベースバ ンド信号をアナログからデジタルに変換して、 自身の後段に接続される O F D M 復調器 8 dにデジタル化したベースバンド信号を送る。 O F DM復調器 8 dは、 デジタル化したベースバンド信号の復調を行い、 テレビ受像器に復調した放送信 号を送る。 The baseband signal amplifier 8b converts the first baseband signal (SIG31B) to the input voltage range of the first AZD converter 8c connected to the subsequent stage. Adjust the signal level to. The first A / D converter 8c converts the input first baseband signal from analog to digital, and sends the digitized baseband signal to the OFDM demodulator 8d connected to itself. . The OFDM demodulator 8d demodulates the digitized baseband signal and sends the demodulated emission signal to the television receiver.
一方、 第 2のベースバンド信号は、 R S S I (受信信号強度表示） 回路 3 5 c に入力された後に、 第 2のベースバンド信号の電力レベルに応じた R S S I出力 信号を出力し、 自身の後段に接続される電流電圧変換器 3 5 dにより、 R S S I 電流信号を R S S I電圧信号に変換する。 電流電圧変換器 3 5 dは、 第 2の AZ D変換器 3 5 eに接続しており、 第 2の AZD変換器 3 5 eは、 R S S I出力電 圧信号をアナログからデジタルに変換して、 制御回路 3 9にデジタル変換後の R S S I信号を送る。  On the other hand, after the second baseband signal is input to the RSSI (received signal strength indication) circuit 35c, the second baseband signal outputs an RSSI output signal corresponding to the power level of the second baseband signal, and is provided at a subsequent stage thereof. The connected current-to-voltage converter 35 d converts the RSSI current signal into an RSSI voltage signal. The current-to-voltage converter 35 d is connected to the second AZD converter 35 e, which converts the RSSI output voltage signal from analog to digital, The digitally converted RSSI signal is sent to the control circuit 39.
制御回路 3 9は、 前記 R S S I信号を記憶回路 4 0にあらかじめ記憶させてお いた変換テーブルに基づいて、 ァンテナ 1端での放送信号の電力レベルを検出す る。 さらに、 制御回路 3 9は、 検出したアンテナ 1端での電力レベルに応じて可 変利得増幅器 3 4 bのゲイン制御や放送電波の有無の判断を行う他に、 局部発振 器 7の周波数設定等の各機能プロックに対する制御を行う。  The control circuit 39 detects the power level of the broadcast signal at the end of the antenna 1 based on the conversion table in which the RSSI signal is stored in the storage circuit 40 in advance. Further, the control circuit 39 controls the gain of the variable gain amplifier 34 b and determines the presence / absence of broadcast waves in accordance with the detected power level at the antenna 1 end, and also sets the frequency of the local oscillator 7. Of each function block.
次に、 移動体向け地上波デジタル放送の検出の方法について、 主に図 5を用い て説明する。  Next, a method of detecting digital terrestrial broadcasting for mobiles will be described mainly with reference to FIG.
本発明の第 3の実施の形態の受信装置を搭載した端末機器が、 移動体向け地上 波デジタル放送の受信を試みようとした場合に、 最初のステップ S 3 1では高周 波増幅回路 3 4をバイパス状態にして、 バンドパスフィルタ 2を通過した受信信 号は第 1の周波数変換器 6に直接入力され、 口一パスフィルタ 8 aと電力分配器 3 3を経由して、 検出回路 3 5に第 2のベースバンド信号が入力される。 このス テツプ S 3 1では、 検出回路 3 5、 制御回路 3 9、 記憶回路 4 0、 第 1の周波数 変換器 6、 局部発振器 7に電源供給を行い、 高周波増幅回路 3 4はスィッチ状態 を保存するためだけに微少な電源を供給し、 その他のベースバンド復調回路 3 8 には電源供給を行わない。 アンテナ 1、 バンドパスフィルタ 2、 電力分配器 3 3 については、 パッシブ素子であり電源供給を必要としないので、 前記放送の検出 動作は正常に機能する。 When a terminal device equipped with the receiving device according to the third embodiment of the present invention attempts to receive a terrestrial digital broadcast for a mobile object, in the first step S31, a high-frequency amplifier circuit 34 , The received signal passing through the band-pass filter 2 is directly input to the first frequency converter 6, passes through the single-pass filter 8 a and the power divider 33, and passes through the detection circuit 35. Is supplied with a second baseband signal. In step S31, power is supplied to the detection circuit 35, the control circuit 39, the storage circuit 40, the first frequency converter 6, and the local oscillator 7, and the high-frequency amplifier circuit 34 is in the switch state. Only a small amount of power is supplied to save the data, and no power is supplied to the other baseband demodulation circuits 38. Since the antenna 1, the band-pass filter 2, and the power divider 33 are passive elements and do not require power supply, the broadcast detection operation functions normally.
次のステップ S 3 2で、 検出テスト回数 N= 0の初期設定を行い、 ステップ S In the next step S32, initial setting of the number of detection tests N = 0 is performed, and
3 3で、 検出回路 3 5、 制御回路 3 9、 記憶回路 4 0を動作させて、 放送信号の 検出を試みる。 放送信号の検出の方法は、 記憶回路 4 0にあらかじめ備えられた 電力変換テーブルに基づいて、 検出回路 3 5で検出した R S S I信号よりアンテ ナ 1端での受信電力を制御回路 3 9が検出する。 At 33, the detection circuit 35, the control circuit 39, and the storage circuit 40 are operated to try to detect a broadcast signal. The broadcast signal is detected by the control circuit 39 detecting the received power at the antenna 1 end from the RSSI signal detected by the detection circuit 35 based on a power conversion table provided in the storage circuit 40 in advance. .
ステップ S 3 4では、 検出テスト回数 Nに 1を加える操作を行って、 検出テス ト回数をカウントアップする。 ステップ S 3 5では、 制御回路 3 9はアンテナ端 での受信電力が閾値以上 (例えば一 8 0 d Bm以上か）であるかどうかを判定し、 前記受信電力が閾値以上であれば、 放送信号が受信可能であると判断してステツ プ S 3 6に進む。 前記受信電力が閾値未満であれば、 ステップ S 3 8に進み、 検 出テスト回数 Nが規定の検出テスト回数 Aより小さい場合は、 一定時間経過後に ステップ S 3 3で再び放送の検出を試みる。 もし、 検出テスト回数 Nが規定の検 出テスト回数 Aと等しくなつた場合はステップ S 3 9で、 放送を受信できる環境 にないと判断して、 検出回路 3 5、 制御回路 3 9、 記憶回路 4 0への電源供給を 停止して、 放送の検出を終了する。  In step S34, an operation of adding 1 to the number N of detection tests is performed, and the number of detection tests is counted up. In step S35, the control circuit 39 determines whether or not the received power at the antenna end is equal to or greater than a threshold (for example, equal to or greater than 180 dBm). Is determined to be receivable, and the process proceeds to step S36. If the received power is less than the threshold value, the process proceeds to step S38, and if the number of detection tests N is smaller than the specified number of detection tests A, the broadcast is detected again in step S33 after a certain time has elapsed. If the number N of detection tests is equal to the specified number A of detection tests, in step S39, it is determined that the environment is not in a state where broadcasting can be received, and the detection circuit 35, the control circuit 39, and the storage circuit Stop power supply to 40 and end broadcast detection.
ステップ S 3 6では、 高周波増幅回路 3 4のバイパス機能を解除して通常の受 信信号の増幅動作を行うようにするとともに、 局部発振器 7、 ベースバンド復調 回路 3 8に電源の供給を開始して、 通常の放送信号受信動作に入る （ステップ S 3 7 ) o  In step S36, the bypass function of the high-frequency amplifier circuit 34 is released so that the normal reception signal amplification operation is performed, and power supply to the local oscillator 7 and the baseband demodulation circuit 38 is started. To enter the normal broadcast signal receiving operation (step S37) o
このように、 放送信号の検出動作時には、 受信信号は高周波増幅回路 3 4をバ ィパスするため、 高周波信号の電源供給を停止あるいは微少な供給量にできるの で、低消費電力化と、移動体向け放送サービスの有無の判断が同時に可能になる。 放送信号の検出が確認された場合には、 高周波増幅回路 3 4に給電を行うことに より、 正常に受信動作が開始される。 In this way, during the detection operation of the broadcast signal, the received signal bypasses the high-frequency amplifier circuit 34, so that the power supply of the high-frequency signal can be stopped or reduced to a small amount, so that the power consumption can be reduced and It is possible to simultaneously determine the presence or absence of a broadcast service for broadcasting. When the detection of the broadcast signal is confirmed, the reception operation is started normally by supplying power to the high-frequency amplifier circuit 34.
以上、 これまでに説明した実施の形態の受信装置は、 高周波 （R F ) 信号から 直接ベースバンド信号に周波数帯をダウンコンバー卜するダイレクトコンバ一 ジョン方式を用いているが、 高周波 （R F) 信号を一度中間周波数 （I F ) 信号 にダウンコンバートする方式を用いても課題の解決は可能である。  As described above, the receiving apparatus according to the embodiments described above uses the direct conversion method in which the frequency band is down-converted directly from a high frequency (RF) signal to a baseband signal. The problem can be solved by using a method of down-converting to an intermediate frequency (IF) signal once.
本発明によれば、 検出回路の検出した信号が復調回路で復調可能なレベルであ れば、 増幅回路に電源を供給し、 検出回路の検出した信号がないか、 あるいは復 調回路で復調不能なレベルであれば、 増幅回路に電源を供給しない制御回路を備 えたので、 必要のないときは消費電力が大きい増幅回路の電源供給を完全に停止 することができ、 低消費電力化と移動体向け放送サービスの有無の判別が両立可 能な受信装置が実現できる。  According to the present invention, if the signal detected by the detection circuit is at a level that can be demodulated by the demodulation circuit, power is supplied to the amplification circuit, and there is no signal detected by the detection circuit or demodulation cannot be performed by the demodulation circuit. Control circuit that does not supply power to the amplifier circuit at any level, the power supply to the amplifier circuit, which consumes a large amount of power, can be completely stopped when it is not needed. It is possible to realize a receiving device that can simultaneously determine the presence or absence of a broadcast service for broadcasting.
特に、 特定の狭い周波数帯の放送の有無を検出において、 検出回路に高周波信 号を中間周波数信号或いはベースバンド信号にダウンコンバートする周波数変換 手段を設けたことにより、 増幅回路を動作させる前に受信信号の検出が可能にな り、 前記増幅回路の電源供給を完全に停止することができる。  In particular, when detecting the presence or absence of broadcasting in a specific narrow frequency band, the detection circuit is provided with frequency conversion means for down-converting a high-frequency signal to an intermediate frequency signal or a baseband signal, so that the signal can be received before the amplifier circuit operates. The signal can be detected, and the power supply to the amplifier circuit can be completely stopped.
また、 本発明によれば、 放送信号のうち、 移動受信用の階層で構成された 1つ のセグメントの周波数帯のみを通過させるバンドパスフィル夕をチャンネル数に 応じて備えることにより、 高周波増幅回路以降の受信信号の復調に直接関係する 回路の電源供給を完全に停止することができるので、 低消費電力化と、 移動体向 け放送サービスの有無の判断が同時に可能になる。  Further, according to the present invention, a high-frequency amplifier circuit is provided by providing, according to the number of channels, a band-pass filter that allows only a frequency band of one segment formed of a layer for mobile reception among broadcast signals to pass therethrough. Since the power supply to circuits directly related to subsequent demodulation of the received signal can be completely stopped, it is possible to simultaneously reduce power consumption and determine whether or not there is a broadcast service for mobiles.
また、 本発明によれば、 放送信号の検出動作時には、 受信信号は増幅回路をバ ィパスするため、 高周波信号の電源供給を停止あるいは微少な供給量にできるの で、低消費電力化と、移動体向け放送サービスの有無の判断が同時に可能になる。 放送信号の検出が確認された場合には、 前記増幅回路に給電を行うことにより、 正常に受信動作が開始される。 このため、 低消費電力化と、 移動体向け放送サ一 ビスの有無の判断が同時に可能になる。 産業上の利用可能性 Further, according to the present invention, during the operation of detecting a broadcast signal, the received signal bypasses the amplifier circuit, so that the power supply of the high-frequency signal can be stopped or reduced to a small amount. At the same time, it is possible to determine whether or not there is a broadcast service for the body. When the detection of the broadcast signal is confirmed, the receiving operation is started normally by supplying power to the amplifier circuit. As a result, low power consumption and broadcasting services for mobile At the same time, it is possible to determine the presence or absence of a screw. Industrial applicability
本発明に係る受信装置は、 地上波デジタル放送等の放送サービス信号を受信す る携帯機器等の受信装置に適しており、 低消費電力化と移動体向け放送サービス の有無の判別を可能とする。  INDUSTRIAL APPLICABILITY The receiving device according to the present invention is suitable for a receiving device such as a portable device that receives a broadcast service signal such as a terrestrial digital broadcast, and can reduce power consumption and determine the presence or absence of a mobile service. .

Claims

請 求 の 範 囲 The scope of the claims
1 . 放送サービス信号を受信する受信装置において、 1. In a receiving device for receiving a broadcast service signal,
受信信号のうち特定の放送周波数帯の信号を検出する検出回路と、  A detection circuit for detecting a signal in a specific broadcast frequency band among the received signals,
受信信号を増幅する増幅回路と、  An amplifier circuit for amplifying the received signal;
前記増幅回路の増幅信号を復調する復調回路と、  A demodulation circuit for demodulating an amplified signal of the amplification circuit;
前記検出回路の検出した信号が前記復調回路で復調可能なレベルであれば、 前 記増幅回路に電源を供給し、 前記検出回路の検出した信号がないか、 あるいは前 記復調回路で復調不能なレベルであれば、 前記増幅回路に電源を供給しない制御 回路とを備えたことを特徴とする受信装置。  If the signal detected by the detection circuit is at a level that can be demodulated by the demodulation circuit, power is supplied to the amplification circuit, and there is no signal detected by the detection circuit, or demodulation cannot be performed by the demodulation circuit. And a control circuit that does not supply power to the amplifier circuit if the level is a level.
2 . 前記検出回路は、  2. The detection circuit comprises:
前記特定の放送周波数帯に応じたローカル信号を出力する局部発振手段と、 該ローカル信号に基づいて前記受信信号を前記特定の放送周波数に対応した中 間周波数信号或いはベースバンド信号に変換する周波数変換手段と、  Local oscillation means for outputting a local signal corresponding to the specific broadcast frequency band; frequency conversion for converting the received signal to an intermediate frequency signal or a baseband signal corresponding to the specific broadcast frequency based on the local signal Means,
該中間周波数信号或いは該ベースバンド信号の強度を検出する検出手段を備え たことを特徴とする前記請求の範囲第 1項に記載の受信装置。  2. The receiving device according to claim 1, further comprising a detecting unit configured to detect the intensity of the intermediate frequency signal or the baseband signal.
3 . 前記検出回路の周波数変換手段は、 パッシブミキサであることを特徵とする 前記請求の範囲第 2項に記載の受信装置。  3. The receiving device according to claim 2, wherein the frequency conversion means of the detection circuit is a passive mixer.
4. 前記復調回路は、 前記局部発振手段が出力するローカル信号に基づいて前記 受信信号を前記特定の放送周波数に対応した中間周波数信号或いはベースバンド 信号に変換する周波数変換手段を備え、 該周波数変換手段は、 アクティブミキサ であることを特徴とする前記請求の範囲第 2項に記載の受信装置。  4. The demodulation circuit includes frequency conversion means for converting the received signal into an intermediate frequency signal or a baseband signal corresponding to the specific broadcast frequency based on a local signal output from the local oscillation means, 3. The receiving device according to claim 2, wherein the means is an active mixer.
5 . 放送サービス信号を受信する受信装置において、  5. In the receiving device for receiving the broadcast service signal,
受信信号のうち特定の放送周波数帯の信号を通すバンドパスフィルタと、 前記バンドパスフィルタを通過した信号を検出する検出回路と、  A band-pass filter that passes a signal of a specific broadcast frequency band among the received signals, a detection circuit that detects a signal that has passed through the band-pass filter,
前記バンドパスフィルタを通過した信号を増幅する増幅回路と、 前記増幅回路の増幅信号を復調する復調回路と、 An amplifier circuit for amplifying a signal that has passed through the band-pass filter; A demodulation circuit for demodulating an amplified signal of the amplification circuit;
前記検出回路の検出した信号が前記復調回路で復調可能なレベルであれば、 前 記増幅回路に電源を供給し、 前記検出回路の検出した信号がないか、 あるいは前 記復調回路で復調不能なレベルであれば、 前記増幅回路に電源を供給しない制御 手段とを備えたことを特徴とする受信装置。  If the signal detected by the detection circuit is at a level that can be demodulated by the demodulation circuit, power is supplied to the amplification circuit, and there is no signal detected by the detection circuit, or demodulation cannot be performed by the demodulation circuit. Control means that does not supply power to the amplifier circuit if the level is a level.
6 . 前記バンドパスフィルタは、  6. The bandpass filter is
1つの放送チャンネルの周波数帯のみを通すフィル夕が、 受信する放送チャン ネル数だけ設けられており、  There are as many broadcast channels as possible to receive, through only one broadcast channel frequency band.
さらに、 前記バンドパスフィルタを通過する信号のうち特定の放送チャンネル の周波数帯の信号を選択するスィッチを設けたことを特徴とする前記請求の範囲 第 5項に記載の受信装置。  6. The receiving apparatus according to claim 5, further comprising a switch for selecting a signal in a frequency band of a specific broadcast channel from signals passing through the band-pass filter.
7 . 放送サービスの信号を受信する受信装置において、  7. In a receiving device for receiving a broadcast service signal,
受信信号を増幅する機能と、 受信信号をバイパスする機能とを切り換え可能な 増幅回路と、  An amplifier circuit that can switch between a function of amplifying the received signal and a function of bypassing the received signal;
バイパスされた受信信号のうち特定の放送周波数帯の信号を検出する検出回路 と、  A detection circuit for detecting a signal in a specific broadcast frequency band among the bypassed received signals;
前記増幅回路の増幅信号を復調する復調回路と、  A demodulation circuit for demodulating an amplified signal of the amplification circuit;
受信信号を前記増幅回路にバイパスさせて前記検出回路に検出させ、 前記検出 回路の検出信号が前記復調回路で復調可能なレベルの場合のみ、 前記増幅回路に 受信信号を増幅させる制御回路とを備えたことを特徴とする受信装置。  A control circuit that causes the amplification circuit to amplify the reception signal only when the detection signal of the detection circuit is at a level that can be demodulated by the demodulation circuit. A receiving device.
PCT/JP2003/001512 2002-03-05 2003-02-13 Receiver apparatus WO2003075473A1 (en)

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JP2002/59175 2002-03-05

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Publication number Priority date Publication date Assignee Title
JP4602185B2 (en) * 2005-07-28 2010-12-22 シャープ株式会社 Reception device and information recording / output device
US8035754B2 (en) 2005-07-28 2011-10-11 Sharp Kabushiki Kaisha Receiver apparatus and information recording/outputting apparatus
JP4813529B2 (en) * 2008-08-25 2011-11-09 シャープ株式会社 Mobile device

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JPS6489822A (en) * 1987-09-30 1989-04-05 Toshiba Corp Radio receiver
JPH03295384A (en) * 1990-04-12 1991-12-26 Miharu Tsushin Kk Power controller for reception unit in television community receiving system
JPH0746148A (en) * 1993-07-29 1995-02-14 Japan Radio Co Ltd Receiver provided with agc circuit
JPH07245568A (en) * 1993-09-09 1995-09-19 Ericsson Inc Radio receiver
JPH09163452A (en) * 1995-12-06 1997-06-20 Toshiba Corp Information processor with radio communication function and radio communication method
JPH11122044A (en) * 1997-10-16 1999-04-30 Advantest Corp Frequency converter
JP2001127659A (en) * 1999-10-29 2001-05-11 Hitachi Kokusai Electric Inc Receiver
JP2001526486A (en) * 1997-12-09 2001-12-18 クゥアルコム・インコーポレイテッド Programmable dynamic range receiver
JP2002064365A (en) * 2000-08-17 2002-02-28 Alinco Inc Automatic tuning receiver

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6489822A (en) * 1987-09-30 1989-04-05 Toshiba Corp Radio receiver
JPH03295384A (en) * 1990-04-12 1991-12-26 Miharu Tsushin Kk Power controller for reception unit in television community receiving system
JPH0746148A (en) * 1993-07-29 1995-02-14 Japan Radio Co Ltd Receiver provided with agc circuit
JPH07245568A (en) * 1993-09-09 1995-09-19 Ericsson Inc Radio receiver
JPH09163452A (en) * 1995-12-06 1997-06-20 Toshiba Corp Information processor with radio communication function and radio communication method
JPH11122044A (en) * 1997-10-16 1999-04-30 Advantest Corp Frequency converter
JP2001526486A (en) * 1997-12-09 2001-12-18 クゥアルコム・インコーポレイテッド Programmable dynamic range receiver
JP2001127659A (en) * 1999-10-29 2001-05-11 Hitachi Kokusai Electric Inc Receiver
JP2002064365A (en) * 2000-08-17 2002-02-28 Alinco Inc Automatic tuning receiver

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JP2003258660A (en) 2003-09-12
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