WO1999065149A1 - Recepteur et procede de reception - Google Patents
Recepteur et procede de reception Download PDFInfo
- Publication number
- WO1999065149A1 WO1999065149A1 PCT/JP1999/002865 JP9902865W WO9965149A1 WO 1999065149 A1 WO1999065149 A1 WO 1999065149A1 JP 9902865 W JP9902865 W JP 9902865W WO 9965149 A1 WO9965149 A1 WO 9965149A1
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- WO
- WIPO (PCT)
- Prior art keywords
- broadcast
- digital
- signal
- circuit
- processing circuit
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
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- 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
- H04B1/16—Circuits
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- 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
- H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- 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
- H04B1/16—Circuits
- H04B1/1607—Supply circuits
- H04B1/1615—Switching on; Switching off, e.g. remotely
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- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
- H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
- H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a receiver and a receiving method for receiving a broadcast wave, and in particular, a broadcast wave signal of an analog broadcast and a broadcast wave signal of a digital broadcast are broadcast in adjacent frequency bands. And a receiving method for a broadcasting system.
- AM Amplitude Modulatio on; Broadcast FM Frequency Modulation
- the material such as audio information to be broadcast is converted into digital information, but it is converted to a broadcast wave signal.
- a digital signal for the broadcast wave signal it is possible to broadcast high-quality audio information, and to add other additional data to the audio information.
- broadcasting can be performed.
- the efficiency of frequency usage can be improved, and more broadcasts can be performed.
- digital broadcast receivers are required in place of analog broadcast receivers. Therefore, to enable a smooth transition from analog broadcasting to digital broadcasting without resistance, analog broadcasting and new digital broadcasting have been adopted. It is hoped that there will be a transitional period in which both coexist.
- an IBOC In Band On Channel
- coexistence is realized by arranging analog broadcast waves and digital broadcast waves in a frequency arrangement as shown in FIG. 5A.
- reference symbol SA indicates a broadcast wave signal (FM signal) of a conventional analog FM broadcast, and its carrier frequency is frequency fRX.
- the digital broadcast broadcast wave signals S D and S D are arranged adjacent to both sides of the broadcast wave signal S A.
- the broadcast wave signals S D and S D may be only one of them.
- the program content based on the broadcast wave signal SD is generally the same as the program content based on the analog broadcast wave signal S A.
- the analog broadcast wave signal S A will be stopped and broadcast will be performed using only the digital broadcast wave signal S D, or the frequency domain used by the broadcast wave signal S A will be used for digital broadcasting.
- the transition from analog broadcasting to digital broadcasting is expected to take 10 to 15 years.
- the power consumption of a digital broadcasting receiver is about 1 W, compared to the power consumption of an analog broadcasting receiver of about 30 mW, which is about 30 times the power consumption of an analog broadcasting receiver. ing. Therefore, receivers that can receive analog broadcasts and digital broadcasts are analog. Large amounts of power are consumed even when receiving log broadcasts.
- An object of the present invention is to provide a novel receiver and a receiving method that can receive both analog broadcasting and digital broadcasting. Another object of the present invention is to provide a power supply voltage to a digital processing circuit only when a digital broadcast can be received, thereby reducing power consumption.
- An object of the present invention is to provide a receiver and a receiving method capable of receiving any broadcast.
- Still another object of the present invention is to provide a receiver and a receiving method capable of accurately determining the presence or absence of a digital broadcast and capable of receiving both an analog broadcast and a digital broadcast capable of reliably selecting a digital broadcast. Is to provide
- the present invention provides a receiver for a broadcast system in which a broadcast wave signal of an analog broadcast and a broadcast wave signal of a digital broadcast are broadcast in adjacent frequency bands.
- An analog processing circuit that processes a signal when a signal is received and extracts an audio signal
- a digital signal processing circuit that processes a signal when a broadcast wave signal of a digital broadcast is received and extracts an audio signal
- analog processing Audio signal from circuit and digital signal processing circuit
- a switching circuit for selectively extracting the audio signal from the digital processing circuit, a control circuit for controlling the supply of the operating power supply voltage to the digital processing circuit, and a detection circuit for detecting that digital broadcasting is selected.
- the control circuit supplies the operating voltage to the digital processing circuit only when the detection circuit detects that the digital broadcast is tuned in at the time of tuning.
- the present invention also provides a receiver for a broadcasting system in which a broadcast wave signal of an analog broadcast and a broadcast wave signal of a digital broadcast are broadcast in adjacent frequency bands, and selects a channel according to the broadcast wave signal of the analog broadcast.
- a digital signal processing circuit for extracting the audio signal, a switching circuit for selectively extracting an audio signal from the analog processing circuit and an audio signal from the digital signal processing circuit, and a supply of an operating power supply voltage to the digital processing circuit.
- a detection circuit for detecting the presence / absence of digital broadcasting. The control circuit supplies the operating power supply voltage to the digital processing circuit only when the transmission circuit is received and the detection circuit detects that the digital broadcast is selected, and the detection circuit receives the digital broadcast. If the control circuit does not detect that the power supply voltage has been detected, the supply of the operating power supply voltage to the digital processing circuit is stopped by the control circuit.
- the present invention provides a receiver for a broadcasting system in which a broadcast wave signal of an analog broadcast and a broadcast wave signal of a digital broadcast are broadcast in adjacent frequency bands, and selects a channel according to the broadcast wave signal of the analog broadcast.
- Circuit for processing analog broadcast signal An analog processing circuit for extracting audio signals from the digital signal processing unit, a digital signal processing circuit for processing a signal when a broadcast wave signal of digital broadcasting is received and extracting an audio signal, and an audio signal from an analog processing circuit.
- a switching circuit for selectively extracting an audio signal from the digital signal processing circuit, a control circuit for controlling supply of an operating power supply voltage to the digital processing circuit, and a detection circuit for detecting the presence or absence of digital broadcasting;
- the control circuit sends the signal to the digital processing circuit only when the detection circuit detects that the digital broadcast has been selected when the broadcast circuit of the channel selection cannot receive the broadcast wave of the analog broadcast.
- the control circuit performs digital processing. It is obtained so as to stop the supply of the operating power supply voltage to the circuit.
- the present invention provides a receiver for a broadcasting system in which a broadcast wave signal of an analog broadcast and a broadcast wave signal of a digital broadcast are broadcast in adjacent frequency bands, and selects a channel according to the broadcast wave signal of the digital broadcast.
- an analog processing circuit that processes the signal when an analog broadcast wave signal is received and extracts the audio signal, and processes the signal when a digital broadcast wave signal is received and extracts the audio signal
- detection means for detecting the presence or absence of digital broadcasting.
- the present invention relates to a receiving method for a broadcasting system in which a broadcast wave signal of an analog broadcast and a broadcast wave signal of a digital broadcast are broadcast in adjacent frequency bands. And determines whether or not digital broadcasting has been tuned.Only when it is determined that digital broadcasting has been tuned, processes the signal when a digital broadcast wave signal is received. Supply the operating power supply voltage to the digital processing circuit that extracts the audio signal and stops the supply of the operating source voltage to the digital processing circuit when it is not determined that the digital broadcast is selected. It is.
- the present invention relates to a receiving method for a broadcasting system in which a broadcast wave signal of an analog broadcast and a broadcast wave signal of a digital broadcast are broadcast in adjacent frequency bands. Only when it is determined that digital broadcasting has been selected, the operating power supply voltage is supplied to the digital processing circuit that processes the signal when receiving the broadcast wave signal of digital broadcasting and extracts the audio signal. However, when it is not determined that the digital broadcast is selected, the supply of the operating power supply voltage to the digital processing circuit is stopped.
- FIG. 1 is a block circuit diagram showing a receiver according to the present invention.
- FIG. 2 is a flowchart showing a first example of a procedure for receiving a broadcast by the receiver according to the present invention.
- FIG. 3 is a flowchart showing a second example of a procedure in which the receiver according to the present invention receives a broadcast.
- FIG. 4 is a flowchart showing a third example of a procedure for receiving a broadcast by the receiver according to the present invention.
- FIG. 5A and FIG. 5B are diagrams showing frequency allocation when a broadcast wave of digital broadcasting and a broadcast wave of analog broadcasting coexist.
- BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example in which the present invention is applied to a direct conversion type receiver will be described.
- the receiver according to the present invention is used in a broadcasting system in which a broadcast wave signal of analog broadcast and a broadcast wave signal of digital broadcast are broadcast in adjacent frequency bands.
- a microcomputer 40 for control is provided, and various operation keys (switches) 41 are connected to the microcomputer 40.
- this receiver receives analog or digital broadcasts on a regular basis, the reception is performed as follows.
- the broadcast wave signal received by the antenna 11 is supplied to an electronic tuning type antenna tuning circuit 12, and a reception signal SRX of a target frequency f RX is selected and extracted, and this signal SRX is converted to a high frequency amplifier. It is supplied to the first and second mixer circuits 14 I and 14 Q through 13.
- the local oscillation circuit 15 is composed of a PLL and a tuning operation is performed by the operation key 41, the oscillation frequency of the local oscillation circuit 15 is controlled by the microcomputer 40 and is equal to the reception frequency f RX.
- Local oscillation signals SLI and SLQ whose phases differ from each other by 90 ° at the oscillation frequency are formed. These signals SLI and SLQ are supplied to mixer circuits 141 and 14Q, respectively.
- the received signal SRX is frequency-converted to the intermediate frequency signals SLI and SLQ in the mixer circuits 141 and 14Q, and extracted from the mixer circuits 141 and 14Q.
- the intermediate frequency signals SII and SIQ are, for example, as shown in FIG. As shown in B, the intermediate frequency is 0, and the low frequency side has signals SAI and S AQ converted from the analog broadcast wave signal SA, and the high frequency side has the frequency converted from the digital broadcast wave signal SD. Having the signal SDI, SDQ.
- the phases of the signals S AI and S AQ frequency-converted from the analog broadcast wave signal S A differ from each other by 90 ° according to the phases of the local oscillation signals S L I and S LQ.
- the intermediate frequency signals SII and SIQ are supplied to low-pass filters 211 and 21Q, and the analog frequency signals SAI and S AQ obtained by converting the analog broadcast wave signal SA from the intermediate frequency signals SII and SIQ are taken. Will be issued.
- These signals SAI and S AQ are connected to a switch circuit described later.
- the signals are supplied to the analog processing circuit 24 through the amplifiers 21 and 22Q through the amplifiers 21 and 22Q.
- This processing circuit 24 performs phase processing and arithmetic processing on the signals SAI and S AQ, performs stereo demodulation processing, and outputs audio signals L and R in analog broadcasting from the signals SAI and S AQ. Take out.
- These audio signals L and R are supplied to the switching circuit 16.
- the intermediate frequency signals SII and SIQ from the mixer circuits 14 1 and 14 Q are supplied to the non-pass filters 3 11 and 31 Q, and the digital broadcast wave signal is transmitted from the intermediate frequency signals SII and SIQ to the frequency from the SD.
- the converted signals SDI and SDQ are taken out, and these signals SDI and SDQ are supplied to the switch circuits 221, 22Q, and to the digital processing circuit 34 through the amplifiers 33I, 33Q. Supplied.
- the processing circuit 34 demodulates the audio signals L and R from the intermediate frequency signals SDI and SDQ corresponding to the digital broadcasting system.
- the audio signals L and R are supplied to the switching circuit 16.
- the amplifiers 33I and 33Q and the processing circuit 34 are integrated on, for example, one chip IC30.
- the control signal S 40 is supplied from the microcomputer 40 to the switching circuit 16, and one of the audio signals L and R from the processing circuit 24 and the audio signals L and R from the processing circuit 34 is selected. Then, the selected audio signals L and R are extracted through a muting circuit 17 as a reception output of an analog broadcast or a digital broadcast.
- the Myu one computing circuit 1 7, a receiver according to c present invention muting control signal S 1 7 is supplied from the micro combi Interview one motor 4 0 includes a further following configuration. In the receiver according to the present invention, if the switch circuits 22 1 and 22 Q are connected in the state shown in FIG. 1, the intermediate frequency signals SAI and S AQ from the low-pass filters 2 II and 21 Q are obtained.
- the intermediate frequency signals (signals SAI, SAQfc5, ttSDI, SDQ) in the amplifiers 231, 23Q are supplied to the level detection circuit 51, and the broadcast wave signals (analog broadcast wave signal SA or digital broadcast wave It is detected whether the signal SD) can be received at a level higher than a predetermined level, and the detection signal S51 is supplied to the microcomputer 40.
- the level detection circuit 51 is generally called an RSI (Received Signal Strength Indicator) circuit.
- a signal (synchronization flag) S34 indicating whether or not the digital processing in the processing circuit 34 is synchronized is extracted from the processing circuit 34, and the signal S34 is supplied to the microcomputer 40. Is done.
- a switch circuit 52 is connected to a power supply line from the amplifier 33 I to the processing circuit 34, that is, a power supply line of the IC 30, as a control circuit of the power supply, and a microcontroller is provided.
- the control signal S52 is supplied from the computer 40 to the switch circuit 52.
- the control signal S40 is supplied from the microcomputer 40 to the switch circuits 22I and 22Q.
- microcomputer 4-0 for example, a reception routine 100 as shown in FIG. 2 is prepared as a part of a program executed by the CPU (not shown).
- step 102 the muting circuit 17 is controlled by the muting control signal S17 to turn on the muting, and then, in step 103, the control is performed.
- the switch 52 is turned off by the signal S52, and the power of the IC 30 is turned off.
- step 104 the control signals S40 connect to the switch circuits 221, 22Q and, as shown in FIG.
- the circuit 16 is connected to the analog processing circuit 24. Therefore, the detection level of the analog broadcast reception can be detected in the detection circuit 51 from this point.
- step 111 predetermined frequency data is supplied to the local oscillation circuit 15 and the reception frequency is set to the target frequency f RX. Then, in step 112, the detection circuit 51 By checking the detection signal S51, it is determined whether the broadcast can be received. That is, since this state is after the process of step 104, it is determined whether the analog broadcast can be received.
- step 112 the process proceeds from step 112 to step 113, and in this step 113, the switch circuit 2 is controlled by the control signal S40.
- 2 1 and 2 2 Q are connected to the band-pass filters 3 1 1 and 3 1 Q, and the switching circuit 16 is connected to the digital processing circuit 3 4, contrary to the state shown in FIG. It is. From this point, the detection circuit 51 is ready to detect the digital broadcast reception level.
- step 114 the broadcast signal can be received by checking the detection signal S51 of the detection circuit 51. That is, since this state is after the processing of step 113, the digital broadcast is It is determined whether reception is possible. Then, when the digital broadcast can be received, the processing proceeds from step 114 to step 115. In this step 115, the switch circuit 52 is turned on by the control signal S52, and the power is supplied to the IC 30. Voltage is supplied. Therefore, after that, the IC 30 executes a process for demodulating the audio signals L and R from the intermediate frequency signals SDI and SDQ of the digital broadcast.
- step 1 16 the signal S 34 is checked to determine whether or not synchronization has been achieved in the digital processing circuit 34, and the synchronization has been achieved. If so, the process proceeds from step 116 to step 117, and in this step 117, the muting of the muting circuit 17 is turned off. At this time, the switching circuit
- the digital broadcast when a digital broadcast can be received, the digital broadcast is selected, an audio signal by the digital broadcast is output, and R is output.
- step 116 the process proceeds to step 121, and in this step 121, the switch circuit 52 is turned off by the control signal S52, and the power of the IC 30 is turned off.
- step 122 in which the switch circuits 22 1 and 22 Q are controlled by the control signal S 40 as shown in FIG.
- the switching circuit 16 is connected to the analog processing circuit 24 while being connected to 21 I and 21 Q, and then the processing proceeds from step 1 16 to step 1 17 and this step is performed.
- step 117 muting of the muting circuit 17 is turned off. From this point, audio signals L and R by analog broadcasting are output. In other words, even if digital broadcasting can be received but synchronization is not achieved, analog broadcasting is selected and audio signals L and R by analog broadcasting are output.
- step 114 when digital broadcasting cannot be received in step 114, the process proceeds from step 114 to step 122. In this case, analog broadcasting is selected and audio signals L and R by analog broadcasting are output. At this time, the power of the IC 30 remains off due to step 103.
- step 112 If analog broadcasting cannot be received in step 112, the process proceeds from step 112 to step 118. In this case, the broadcast wave is not selected. For example, if a channel is selected by scanning, the reception routine 100 is executed again at the next reception frequency. Then, at this time, the power of the IC 30 remains off in step 103.
- the receiver according to the present invention has a receiving routine 2. 00 can be performed.
- steps 201 to 211 and steps 21 to 213 are performed in steps 101 to 11 in the reception routine 100 shown in FIG. 1 and the same processing as in steps 113 to 117 are performed, and the description is omitted here.
- step 231 the control circuit S40 connects the switch circuits 221, 22Q to the band-pass filters 31I, 31Q, contrary to FIG. 16 is connected to the digital processing circuit 34.
- the detection level of the digital broadcast can be detected by the detection circuit 51.
- step 2 32 by checking the detection signal S 51 of the detection circuit 51, it is determined whether or not the broadcast can be received. In other words, in this case, since the processing in step 2 31 is performed, It is determined whether digital broadcasting can be received.
- step 233 the switch circuit 52 is turned on by the control signal S52 and the IC 30 Is supplied with a power supply voltage. Therefore, after that, the IC 30 executes a process for demodulating the audio signals L and R from the intermediate frequency signals SDI and SDQ of the digital broadcast.
- step 234 by checking the signal S34, it is determined whether or not synchronization has been achieved in the digital processing circuit 34. If so, the process proceeds from step 234 to step 217, in which the muting of the muting circuit 17 is off. And At this time, since the switching circuit 16 is connected to the digital processing circuit 34 in step 2 31, the audio signals L and R by digital broadcasting are output from the muting circuit 17 from this point. become. Also, the processing of the routine 200 ends with the following step 218.
- the digital broadcasting when digital broadcasting can be received even when analog broadcasting cannot be received, the digital broadcasting is selected and audio signals L and R by digital broadcasting are output.
- step 2 34 If the synchronization is not established in step 2 34, the process proceeds to step 2 41 from step 2 34, and in this step 2 41, the switch circuit 52 is turned off by the control signal S 52. Then, the power supply of the IC 30 is turned off, and the processing is terminated by the step 2 18.
- step 232 when digital broadcasting cannot be received in step 232, the process proceeds from step 232 to step 218. In this case, the broadcast is not selected. For example, at the time of selecting a channel by scanning, the routine 200 is executed again at the next reception frequency. Then, at this time, in step 203, the power supply of IC 30 remains off.
- the receiver and the receiving method of the present invention first, it is determined whether analog broadcasting can be received, and then whether or not digital broadcasting in an adjacent frequency band can be received is determined. Only when possible, the operating power supply voltage is supplied to the digital signal processing circuit 34, so that unnecessary power consumption can be suppressed.
- the operation of the digital processing circuit 34 is stopped. Therefore, the noise signal generated in the digital processing circuit 34 does not interfere with the channel selection operation or the detection of the reception level. Further, the presence or absence of digital broadcasting can be accurately determined.
- the reception routine 100 ° or 200 ° is assumed to be executed at the time of channel selection.However, it can also be executed at the time of power-on.
- the frequency that was received when the power was last turned off, that is, the so-called last channel may be set.
- the above-described reception routine 100 or 200 determines whether or not digital broadcasting can be received after determining whether or not analog broadcasting can be received, but, of course, whether or not digital broadcasting can be received first. May be determined. An example of this will be described with a reception routine 300 as shown in FIG.
- Steps 301 to 303 in the reception routine 300 are the same as steps 101 to 103 in the reception routine 100 shown in FIG.
- the control signals S40 connect the switch circuits 221, 22Q to the bandpass filters 31I, 31Q, contrary to FIG. Are connected to the digital processing circuit 34. From this point, the detection level of the digital broadcast can be detected by the detection circuit 51.
- step 311 predetermined frequency data is supplied to the local oscillation circuit 15, and the reception frequency is set to a target frequency f RX. Then, in step 312, the detection circuit 5 1 Check the detection signal S51 to see if you can receive the broadcast. In this case, since the processing in step 304 has been performed, it is determined whether or not digital broadcasting can be received.
- step 3221 the control circuit S52 turns on the switch circuit 52, and the power supply voltage is applied to the IC 30. Supplied. Thereafter, the IC 30 executes a process for demodulating the audio signals L and R from the intermediate frequency signals SDI and SDQ of the digital broadcast.
- step 3 22 by checking the signal S 34, it is determined whether or not synchronization has been achieved in the digital processing circuit 34. If so, the process proceeds from step 3 22 to step 3 15, and in this step 3 15, the muting of the muting circuit 17 is turned off. At this time, since the switching circuit 16 is connected to the digital processing circuit 34 in step 304, the digital broadcast audio signals L and R are output from the muting circuit 17 from this point. Become. Further, the processing of the reception routine 300 ends with the following step 316.
- step 322 when synchronization is not achieved, the process proceeds from step 322 to step 331, in which the switch circuit 52 is turned off by the control signal S52. As a result, the power of the IC 30 is turned off, and the processing ends in step 3 16.
- step 313 the switch circuits 22 1 and 22 Q are controlled by the control signal S 40 as shown in FIG.
- the switching circuit 16 is connected to the analog processing circuit 24 while being connected to the low-pass filters 211 and 21Q. This allows the detection circuit 51 to detect the reception level of the analog broadcast.
- step 3 14 it is necessary to check the detection signal S 51 of the detection circuit 51 to determine whether or not the broadcast can be received. It is determined whether reception is possible.
- step 315 the muting of the muting circuit 17 is turned off.
- the switching circuit 16 is connected to the analog processing circuit 24 in steps 3 13, the audio signals L and R by analog broadcasting are output from the muting circuit 17 from this point. Will be done.
- the processing of the reception routine 300 ends with the following step 316.
- analog broadcasting is selected and audio signals L and R by analog broadcasting are output.
- step 314 If analog broadcasting cannot be received in step 314, the process proceeds from step 314 to step 316, and the processing of the reception routine 300 ends. Therefore, in this case, the broadcast is not selected, and, for example, at the time of channel selection by scanning, the reception routine 300 is executed again at the next reception frequency.
- the audio signals L and R of the analog broadcasting are output from the muting circuit 17 and After that, when the digital broadcast can be received, it is possible to switch to the output of audio signals L and R by digital broadcast.
- the determination as to whether or not the digital broadcast can be received may be performed by detecting at predetermined time intervals. Alternatively, the switching can be performed by operating the listener. That is, when analog broadcasting and digital broadcasting are being performed, the listener can select a desired broadcast.
- switch circuit 5 when not receiving a digital broadcast Kiniwa, yo les if a circuit to reduce power consumption of the digital processing circuit 3 4, c also FIG. 2, respectively 3 and 4 Steps 1 16, 2 16, 2 34, and 3 22 shown in the figure are processes for more reliably determining the presence or absence of digital broadcasting, and can be omitted.
- the power of the digital processing circuit is turned off as in the reception routines 100, 200, and 300 shown in FIGS. 2, 3, and 4, respectively. It may end, but repeats the steps to detect whether or not digital broadcasting can be received at predetermined time intervals. If digital broadcasting reception is detected, supply the operating power supply voltage to the digital processing circuit. In addition, the audio signal L and the length of the digital broadcast may be output through the muting circuit 17.
- Industrial applicability The present invention relates to an analog processing circuit for processing a signal when an analog broadcast is received to extract an audio signal, a digital processing circuit for processing a signal when a digital broadcast is received to extract an audio signal, and an analog processing circuit.
- a switching circuit for selectively extracting an audio signal from a circuit and an audio signal from a digital processing circuit; a control circuit for controlling the operating power supply voltage of the digital processing circuit; and a detection circuit for detecting channel selection of digital broadcasting. Since the control circuit supplies the drive power supply voltage to the digital processing circuit only when the detection circuit detects that the digital broadcast is being tuned, the extra power is used. Noise can be reduced, and the noise signal generated in the digital processing circuit interferes with channel selection and reception level detection. Can be prevented, and the presence or absence of digital broadcasting can be accurately determined.
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69941246T DE69941246D1 (de) | 1998-06-09 | 1999-05-28 | Empfänger und empfangsverfahren |
JP2000554057A JP4147744B2 (ja) | 1998-06-09 | 1999-05-28 | 受信機及び受信方法 |
EP99922577A EP1011203B1 (en) | 1998-06-09 | 1999-05-28 | Receiver and method of reception |
KR1020007001010A KR100621656B1 (ko) | 1998-06-09 | 1999-05-28 | 수신기 및 수신방법 |
US09/485,204 US6466776B1 (en) | 1998-06-09 | 1999-05-28 | Receiver and method of reception |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/160978 | 1998-06-09 | ||
JP16097898 | 1998-06-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999065149A1 true WO1999065149A1 (fr) | 1999-12-16 |
Family
ID=15726255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/002865 WO1999065149A1 (fr) | 1998-06-09 | 1999-05-28 | Recepteur et procede de reception |
Country Status (7)
Country | Link |
---|---|
US (1) | US6466776B1 (ja) |
EP (1) | EP1011203B1 (ja) |
JP (1) | JP4147744B2 (ja) |
KR (1) | KR100621656B1 (ja) |
CN (1) | CN1137543C (ja) |
DE (1) | DE69941246D1 (ja) |
WO (1) | WO1999065149A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006042048A (ja) * | 2004-07-28 | 2006-02-09 | Sony Corp | 受信装置及び受信方法 |
JP2010539862A (ja) * | 2007-09-21 | 2010-12-16 | 京セラ株式会社 | 複数の通信アクセス技術の存在の検知 |
CN104822110A (zh) * | 2015-04-20 | 2015-08-05 | 青岛歌尔声学科技有限公司 | 一种多音频通道切换控制电路和音频设备 |
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US6792051B1 (en) | 2000-07-25 | 2004-09-14 | Thomson Licensing S.A. | In-band-on-channel broadcast system for digital data |
JP4310600B2 (ja) * | 2000-08-04 | 2009-08-12 | ソニー株式会社 | 受信回路および受信用集積回路 |
KR20030025603A (ko) * | 2001-09-21 | 2003-03-29 | (주)프리샛 코리아 | 아날로그 및 디지털 방송 복합수신기 및 그 수신 방법 |
JP4130367B2 (ja) * | 2003-01-10 | 2008-08-06 | 三菱電機株式会社 | 受信装置 |
JP4236564B2 (ja) * | 2003-11-21 | 2009-03-11 | 富士通テン株式会社 | 音声放送受信装置 |
DE102004020551A1 (de) | 2004-04-27 | 2005-11-17 | Robert Bosch Gmbh | Vorrichtung für den Empfang von Rundfunksignalen |
KR100713424B1 (ko) * | 2005-07-06 | 2007-05-04 | 삼성전자주식회사 | 디지털 방송 수신 장치 및 방법 |
US7720454B1 (en) * | 2006-03-07 | 2010-05-18 | Marvell International Ltd. | Extremely low IF architecture for in-band on-channel (IBOC) radio |
KR101556609B1 (ko) | 2008-06-03 | 2015-10-02 | 삼성전자주식회사 | 송신장치, 수신장치, 이를 결합한 전송시스템 및 그 방법 |
JP2012004750A (ja) * | 2010-06-15 | 2012-01-05 | Fujitsu Ten Ltd | 放送受信装置および放送受信方法 |
US8898723B2 (en) * | 2010-08-20 | 2014-11-25 | Sony Corporation | Virtual channel declarative script binding |
CN103546177B (zh) * | 2013-10-24 | 2016-03-23 | 北京锐安科技有限公司 | 射频接收装置及车载空口监测设备 |
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- 1999-05-28 DE DE69941246T patent/DE69941246D1/de not_active Expired - Lifetime
- 1999-05-28 EP EP99922577A patent/EP1011203B1/en not_active Expired - Lifetime
- 1999-05-28 KR KR1020007001010A patent/KR100621656B1/ko not_active IP Right Cessation
- 1999-05-28 WO PCT/JP1999/002865 patent/WO1999065149A1/ja active IP Right Grant
- 1999-05-28 CN CNB998013234A patent/CN1137543C/zh not_active Expired - Fee Related
- 1999-05-28 US US09/485,204 patent/US6466776B1/en not_active Expired - Lifetime
- 1999-05-28 JP JP2000554057A patent/JP4147744B2/ja not_active Expired - Fee Related
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JPS5739629A (en) * | 1980-08-21 | 1982-03-04 | Matsushita Electric Ind Co Ltd | Radio equipment |
JPS61270925A (ja) * | 1985-05-27 | 1986-12-01 | Sony Corp | 受信機 |
JPH06217237A (ja) * | 1993-01-20 | 1994-08-05 | Fujitsu General Ltd | Pcm/fm音声自動切換装置 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006042048A (ja) * | 2004-07-28 | 2006-02-09 | Sony Corp | 受信装置及び受信方法 |
JP4582397B2 (ja) * | 2004-07-28 | 2010-11-17 | ソニー株式会社 | 受信装置及び受信方法 |
JP2010539862A (ja) * | 2007-09-21 | 2010-12-16 | 京セラ株式会社 | 複数の通信アクセス技術の存在の検知 |
CN104822110A (zh) * | 2015-04-20 | 2015-08-05 | 青岛歌尔声学科技有限公司 | 一种多音频通道切换控制电路和音频设备 |
CN104822110B (zh) * | 2015-04-20 | 2018-09-04 | 青岛歌尔声学科技有限公司 | 一种多音频通道切换控制电路和音频设备 |
Also Published As
Publication number | Publication date |
---|---|
KR100621656B1 (ko) | 2006-09-13 |
EP1011203A1 (en) | 2000-06-21 |
JP4147744B2 (ja) | 2008-09-10 |
EP1011203A4 (en) | 2005-01-05 |
CN1137543C (zh) | 2004-02-04 |
DE69941246D1 (de) | 2009-09-24 |
US6466776B1 (en) | 2002-10-15 |
EP1011203B1 (en) | 2009-08-12 |
KR20010022428A (ko) | 2001-03-15 |
CN1275268A (zh) | 2000-11-29 |
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