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公开(公告)号：KR880000460B1
公开(公告)日：1988-04-06
申请号：KR820001549
申请日：1982-04-06
Applicant: SONY CORP
Inventor： YOKOYA SATOSHI
Abstract: A radio receiver with AM stereo signal demodulator uses left and right channel sum and difference signals. The design minimises noise burst interference and separation effects between left and right channels. A tuner produces an intermediate frequency and a subsequent detector separates the summed left and right signal plus signal level information. The 'IF' is also fed to circuits which process the left and right difference signals. The signal level information from the sum signal detectors is fed via a control circuit into the difference channel for phase modulation and comparison with the non-modulated signal and multiplication with it.
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公开(公告)号：KR880000461B1
公开(公告)日：1988-04-06
申请号：KR820001551
申请日：1982-04-06
Applicant: SONY CORP
Inventor： YOKOYA SATOSHI
Abstract: The circuit uses distortion correcting signal and includes a first differential amplifier comprising two transistors. The bases of the transistors are supplied with the received AM stereo signal. At least one transistor is provided for supplying the distortion correcting signal to either the emitters or the collectors of the two transistors. Diodes are connected between the collector of the first transistor and a reference voltage source and between the collector of the second transistor and the reference voltage source.
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公开(公告)号：DE69310584T2
公开(公告)日：1997-09-11
申请号：DE69310584
申请日：1993-03-08
Applicant: SONY CORP
Inventor： YOKOYA SATOSHI , TAKAO NOBUTAKA
IPC: H03G3/20
Abstract: A power control circuit for use in radio transmitters such as portable telephone sets. The circuit comprises a power amplifier for amplifying in terms of power a transmission signal to obtain an output signal; control circuits (35-37) for controlling the amplitude of the signal output (S13) by the power amplifier (13); a limiter (41) for partially limiting the amplitude of the signal from the power amplifier (13) in order to obtain an output signal; a multiplication circuit (42) for multiplying the output signal from the limiter (41) and part of the signal from the power amplifier (13) in order to acquire an output signal (S13); a low-pass filter (44) for extracting a DC component (V44) of the output signal (S42) from the multiplication circuit (42); and a comparison circuit (33) for comparing the DC component (V44) from the low-pass filter with a reference voltage (V32) in order to obtain a comparison output (S33). The comparison output (S32) from the comparison circuit (33) is supplied to the control circuits (35-37), and the control circuits control the level of the signal (S13) from the power amplifier (13) so that the DC component (V44) from the low-pass filter (44) will become equal to the reference voltage (V32) regardless of temperature change.
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公开(公告)号：DE69031004D1
公开(公告)日：1997-08-14
申请号：DE69031004
申请日：1990-04-02
Applicant: SONY CORP
Inventor： YOKOYA SATOSHI , INOUE TAKAYUKI , TAKAO NOBUTAKA , SOMENO NOBURU
Abstract: A radio communication apparatus comprising a modulating portion (35) for modulating a carrier with a signal to transmit so as to produce a transmissible signal (St); a signal transmitting portion (39) for transmitting the transmissible signal; a level adjusting portion (36) for adjusting a level of the signal to transmit or a level of a control signal used for controlling the transmissible signal in accordance with digital control data (Df) supplied to the level adjusting portions; a memory (32) for storing digital adjusting data (Dat); and a control unit (31) for reading the digital adjusting data (Dat) from the memory (32) and supplying the level adjusting portion (36) with the digital adjusting data read from the memory or modified digital adjusting data (Df) obtained based on the digital adjusting data (Dat) read from the memory (32) as the digital control data.
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公开(公告)号：DE69023379D1
公开(公告)日：1995-12-14
申请号：DE69023379
申请日：1990-04-03
Applicant: SONY CORP
Inventor： YASUDA HIROSHI , YOKOYA SATOSHI , TAKAO NOBUTAKA
Abstract: A radio communication apparatus has a modulating portion (46) for modulating a carrier with a signal to be transmitted so as to produce a transmissible signal. A signal transmitting portion (48) causes the transmissible signal to he subjected to power amplification. The transmissible signal is transmitted after having been subjected to power amplification. A cooling device (26) is provided for cooling by force a heat source contained in the signal transmitting portion (48) in response to a condition detector (56) for detecting a temperature condition or an operating condition of the signal transmitting portion. An operation control unit (60) is operative to cause the cooling device (28) to be in operation when a particular temperature condition in which temperature of the signal transmitting portion (48) has exceeded a predetermined value or a particular operating condition in which the signal transmitting portion (48) has been in a predetermined state is detected by the condition detector (56).
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Patent Agency Ranking
公开(公告)号：CA1174737A
公开(公告)日：1984-09-18
申请号：CA399820
申请日：1982-03-30
Applicant: SONY CORP
Inventor： YOKOYA SATOSHI
Abstract: A stereo demodulating circuit for an AM stereo receiver includes an IF stage for producing an IF signal from a received AM stereo signal of the type having a carrier amplitude-modulated with the sum of left and right channel signals and the carrier phase-modulated with the difference of the left and right channel signals; an envelope detector for producing a sum signal corresponding to the sum of the left and right channel signals in response to the IF signal, and having level information, amplitude-modulation information and a DC component; a negative peak limiter for limiting the minimum level of the sum signal from the envelope detector; a divider for dividing the IF signal by the sum signal with its minimum level limited to produce a phase-modulation signal; a phase-locked loop for producing a non-modulation signal from the IF signal; a low-pass filter for removing the amplitude-modulation information from the sum signal from the envelope detector to produce a level information signal having only the level information; a second negative peak limiter for limiting the minimum level of the level information signal; multiplier for multiplying the level information signal with its minimum level limited, the non-modulation signal and the phase-modulation signal to produce a difference signal; and a matrix from reproducing the left and right channel signals in response to the sum signal with its DC component removed and the difference signal with a carrier component thereof removed.
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公开(公告)号：AU2385584A
公开(公告)日：1984-08-02
申请号：AU2385584
申请日：1984-01-27
Applicant: SONY CORP
Inventor： SHIMIZU YOSHIO , YOKOYA SATOSHI
Abstract: A pilot signal detecting circuit for use in an AM stereo receiver capable of receiving and demodulating AM stereo signals broadcast according to any of several different AM stereo modulation methods, in which the particular method employed in broadcasting the AM stereo signals is determined by detecting the individual pilot signal and providing an indication of the particular method employed in modulating the broadcast AM stereo signal. Replicas of each of the different pilot signal frequencies in each of the different AM stereo modulation systems are generated and a signal containing the pilot signal is extracted from the demodulated received AM stereo signal. The replicas are compared with the extracted pilot signal to determine the identity of the AM stereo modulation system employed in the received AM stereo signal. A phase-locked-loop is employed to extract the pilot signal from the received signal and a synchronous detector and envelope detector are employed to demodulate the left and right channel stereo signals from the received AM stereo signal. Comparison of the replica and the received pilot signal is performed in identical phase detectors which receive a corresponding replica of the pilot signal produced by another phase-locked-loop and a frequency divider.
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公开(公告)号：DE3225400A1
公开(公告)日：1983-01-27
申请号：DE3225400
申请日：1982-07-07
Applicant: SONY CORP
Inventor： YOKOYA SATOSHI
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公开(公告)号：DE3213922A1
公开(公告)日：1982-11-25
申请号：DE3213922
申请日：1982-04-15
Applicant: SONY CORP
Inventor： YOKOYA SATOSHI
IPC: H03D1/22 , H03H11/04 , H03K19/08 , H03L7/10 , H03L7/107 , H04B1/26 , H04H1/00 , H04H40/36 , H03L7/08 , H04H5/00
Abstract: A phase-locked loop circuit comprises an oscillator, a phase comparator which compares the phase of an input signal with the phase of an oscillator signal, a detector which detects when the phase-locked loop circuit is locked within a predetermined frequency range and produces a corresponding lock detecting signal, and a filter circuit including a variable current source which produces a variable current in response to a change of state of the lock detecting signal to control the bandwidth of the filter circuit, a filter element which receives the variable current, a differential amplifier which receives the phase-compared signal, a current mirror circuit which receives the variable current from the variable current source, and a buffer circuit connected to the filter element which supplies an output signal to the oscillator to lock the frequency of the oscillator signal to the frequency of the input signal.
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公开(公告)号：DE69429555T2
公开(公告)日：2002-08-08
申请号：DE69429555
申请日：1994-05-20
Applicant: SONY CORP
Inventor： YOKOYA SATOSHI
Abstract: A radio communication apparatus capable of varying the level of its transmission output, comprising a receiving circuit, a transmitting circuit, an amplifier (14), an extractor, a detector (33), a variable voltage converter (40) and a control circuit (21). The receiving circuit receives a signal from an opposite station such as a base station, and the transmitting circuit transmits a signal to the opposite station. The amplifier (14) amplifies the output signal obtained from the transmitter, and the extractor extracts data from the output signal of the receiving circuit so as to control the level of the transmission output. The detector (33) detects the level of the transmission output obtained from the amplifier (14), and the variable voltage converter (40) converts a source voltage into the operating voltage of the amplifier. And the control circuit (21) produces a control signal to control the magnitude of the operating voltage supplied from the variable voltage converter (40) to the amplifier in response to both the detection signal (V33) from the detector and the output signal (V31) from the extractor, and supplies the produced control signal (V32) to the variable voltage converter. The transmission output obtained from the amplifier is varied by changing the operating voltage supplied from the variable voltage converter to the amplifier.
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