WO2003075473A1 - Recepteur - Google Patents

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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
English (en)
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/fr

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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. .

Abstract

Un circuit de détection (5), un circuit de contrôle (9) et un circuit de mémoire (10) sont alimentés en puissance, tandis qu'un circuit d'amplification haute fréquence (4) et un circuit de démodulation de bande de base (8) ne le sont pas. A l'aide d'une table de conversion de puissance élaborée et mémorisée dans le circuit de mémoire (10), le circuit de contrôle (9) détecte, à partir d'un signal RSSI détecté par le circuit de détection (5), la puissance de réception au niveau d'une antenne (1). Ce circuit de contrôle (9) détermine si la puissance de réception au niveau du terminal de l'antenne est supérieure à une valeur de seuil (par exemple, -80dBm). Si c'est le cas, le circuit de contrôle (9) estime que le signal de diffusion est recevable. Dans ce cas, le circuit d'amplification haute fréquence (4) et le circuit de démodulation de bande de base (8) commencent à être alimentés en puissance afin d'entrer dans un mode de fonctionnement normal de réception de signal de diffusion.
PCT/JP2003/001512 2002-03-05 2003-02-13 Recepteur WO2003075473A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003211511A AU2003211511A1 (en) 2002-03-05 2003-02-13 Receiver apparatus

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Application Number Priority Date Filing Date Title
JP2002/59175 2002-03-05
JP2002059175A JP3907499B2 (ja) 2002-03-05 2002-03-05 受信装置およびこれを用いた移動体端末

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WO2003075473A1 true WO2003075473A1 (fr) 2003-09-12

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WO (1) WO2003075473A1 (fr)

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
US8035754B2 (en) 2005-07-28 2011-10-11 Sharp Kabushiki Kaisha Receiver apparatus and information recording/outputting apparatus
JP4602185B2 (ja) * 2005-07-28 2010-12-22 シャープ株式会社 受信装置および情報記録出力装置
JP4813529B2 (ja) * 2008-08-25 2011-11-09 シャープ株式会社 携帯端末

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JPS6489822A (en) * 1987-09-30 1989-04-05 Toshiba Corp Radio receiver
JPH03295384A (ja) * 1990-04-12 1991-12-26 Miharu Tsushin Kk テレビ共聴システムにおける受動機器の電源制御装置
JPH0746148A (ja) * 1993-07-29 1995-02-14 Japan Radio Co Ltd Ａｇｃ回路付受信機
JPH07245568A (ja) * 1993-09-09 1995-09-19 Ericsson Inc ラジオ受信機
JPH09163452A (ja) * 1995-12-06 1997-06-20 Toshiba Corp 無線通信機能付き情報処理装置及び無線通信方法
JPH11122044A (ja) * 1997-10-16 1999-04-30 Advantest Corp 周波数変換装置
JP2001127659A (ja) * 1999-10-29 2001-05-11 Hitachi Kokusai Electric Inc 受信機
JP2001526486A (ja) * 1997-12-09 2001-12-18 クゥアルコム・インコーポレイテッド プログラマブルダイナミックレンジ受信器
JP2002064365A (ja) * 2000-08-17 2002-02-28 Alinco Inc 自動同調受信機

Patent Citations (9)

* 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 (ja) * 1990-04-12 1991-12-26 Miharu Tsushin Kk テレビ共聴システムにおける受動機器の電源制御装置
JPH0746148A (ja) * 1993-07-29 1995-02-14 Japan Radio Co Ltd Ａｇｃ回路付受信機
JPH07245568A (ja) * 1993-09-09 1995-09-19 Ericsson Inc ラジオ受信機
JPH09163452A (ja) * 1995-12-06 1997-06-20 Toshiba Corp 無線通信機能付き情報処理装置及び無線通信方法
JPH11122044A (ja) * 1997-10-16 1999-04-30 Advantest Corp 周波数変換装置
JP2001526486A (ja) * 1997-12-09 2001-12-18 クゥアルコム・インコーポレイテッド プログラマブルダイナミックレンジ受信器
JP2001127659A (ja) * 1999-10-29 2001-05-11 Hitachi Kokusai Electric Inc 受信機
JP2002064365A (ja) * 2000-08-17 2002-02-28 Alinco Inc 自動同調受信機

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