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公开(公告)号：GB2126812B
公开(公告)日：1986-05-08
申请号：GB8323064
申请日：1983-08-26
Applicant: RCA CORP
Inventor： RINDAL ABRAHAM E , GRIFFIS PATRICK DOUGLAS
Abstract: A phase-locked loop (53) is provided for detecting the audio information from a television signal. A voltage controllable oscillator (VCO) (50) having a nominal oscillation frequency equal to the frequency difference between the intermediate frequency (IF) picture and sound carriers provides one input to a mixer (44) and a substantially unmodulated picture carrier is supplied as the other input to the mixer (44), which thereby provides a frequency translated output signal. A phase detector (48) has as its first input the output signal from the mixer (44) and as its second input the frequency modulated sound carrier. A lowpass filter (52) coupled between the output of the phase detector (48) and a control input to the VCO (50) completes the PLL. The detected audio information is provided at the output of the lowpass filter (52). The PLL can provide, according to another embodiment, a defect control signal which, when applied to compensation circuitry, reduces impulse noise effects in the video information.
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公开(公告)号：DE3443628A1
公开(公告)日：1985-06-05
申请号：DE3443628
申请日：1984-11-29
Applicant: RCA CORP
Abstract: A multiplier for multiplying the modulated sound and picture carriers to produce an intercarrier sound signal in a quasi-parallel sound channel of an IF section has a pair of anti-parallel connected diodes in a limiter for generating an amplitude limited version of the picture carrier. It has been discovered that the varying capacitance of the diodes with picture amplitude can cause phase shifts and hence phase modulation interference in the intercarrier signal. The latter is especially troublesome for stereo sound reproduction. To reduce such interference, a low value resistor is shunt coupled to the diodes to inhibit the capacitance variations of the diodes and resulting undesired phase modulation in the intercarrier sound signal.
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公开(公告)号：DE3331076A1
公开(公告)日：1984-03-01
申请号：DE3331076
申请日：1983-08-29
Applicant: RCA CORP
Inventor： RINDAL ABRAHAM E , GRIFFIS PATRICK DOUGLAS
IPC: H04N5/60
Abstract: A phase-locked loop (53) is provided for detecting the audio information from a television signal. A voltage controllable oscillator (VCO) (50) having a nominal oscillation frequency equal to the frequency difference between the intermediate frequency (IF) picture and sound carriers provides one input to a mixer (44) and a substantially unmodulated picture carrier is supplied as the other input to the mixer (44), which thereby provides a frequency translated output signal. A phase detector (48) has as its first input the output signal from the mixer (44) and as its second input the frequency modulated sound carrier. A lowpass filter (52) coupled between the output of the phase detector (48) and a control input to the VCO (50) completes the PLL. The detected audio information is provided at the output of the lowpass filter (52). The PLL can provide, according to another embodiment, a defect control signal which, when applied to compensation circuitry, reduces impulse noise effects in the video information.
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公开(公告)号：GB2167620A
公开(公告)日：1986-05-29
申请号：GB8430040
申请日：1984-11-28
Applicant: RCA CORP
Abstract: A multiplier for multiplying the modulated sound and picture carriers to produce an intercarrier sound signal in a quasi-parallel sound channel of an IF section has a pair of anti-parallel connected diodes in a limiter for generating an amplitude limited version of the picture carrier. It has been discovered that the varying capacitance of the diodes with picture amplitude can cause phase shifts and hence phase modulation interference in the intercarrier signal. The latter is especially troublesome for stereo sound reproduction. To reduce such interference, a low value resistor is shunt coupled to the diodes to inhibit the capacitance variations of the diodes and resulting undesired phase modulation in the intercarrier sound signal.
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公开(公告)号：GB2129241B
公开(公告)日：1986-01-02
申请号：GB8328684
申请日：1983-10-27
Applicant: RCA CORP
Inventor： GRIFFIS PATRICK DOUGLAS , RINDAL ABRAHAM E
Abstract: A frequency translation phase-locked loop (PLL) is provided for detecting the audio information from a received television signal. The PLL includes a switching arrangement which, in a first position causes the loop to process the IF picture and sound carriers for detecting the audio information in an intercarrier type of detection method and, in a second position causes the loop to process the IF sound carrier for detecting the audio information without the use of the received picture carrier, in a "separate" (split-sound) type of audio detection method.
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Patent Agency Ranking
公开(公告)号：GB2167620B
公开(公告)日：1987-12-09
申请号：GB8430040
申请日：1984-11-28
Applicant: RCA CORP
Abstract: A multiplier for multiplying the modulated sound and picture carriers to produce an intercarrier sound signal in a quasi-parallel sound channel of an IF section has a pair of anti-parallel connected diodes in a limiter for generating an amplitude limited version of the picture carrier. It has been discovered that the varying capacitance of the diodes with picture amplitude can cause phase shifts and hence phase modulation interference in the intercarrier signal. The latter is especially troublesome for stereo sound reproduction. To reduce such interference, a low value resistor is shunt coupled to the diodes to inhibit the capacitance variations of the diodes and resulting undesired phase modulation in the intercarrier sound signal.
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7.发明专利
公开(公告)号：CA1212465A
公开(公告)日：1986-10-07
申请号：CA439437
申请日：1983-10-21
Applicant: RCA CORP
Inventor： GRIFFIS PATRICK D , RINDAL ABRAHAM E
Abstract: A frequency translation phase locked loop (PLL) is provided for detecting the audio information from a received television signal. The PLL includes a switching arrangement which, in a first position causes the loop to process the IF picture and sound carriers for detecting the audio information in an intercarrier type of detection method and, in a second position causes the loop to process the IF sound carrier for detecting the audio information without the use of the received picture carrier, in a "separate" (split-sound) type of audio detection method.
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公开(公告)号：FR2555848A1
公开(公告)日：1985-05-31
申请号：FR8418123
申请日：1984-11-28
Applicant: RCA CORP
Abstract: A multiplier for multiplying the modulated sound and picture carriers to produce an intercarrier sound signal in a quasi-parallel sound channel of an IF section has a pair of anti-parallel connected diodes in a limiter for generating an amplitude limited version of the picture carrier. It has been discovered that the varying capacitance of the diodes with picture amplitude can cause phase shifts and hence phase modulation interference in the intercarrier signal. The latter is especially troublesome for stereo sound reproduction. To reduce such interference, a low value resistor is shunt coupled to the diodes to inhibit the capacitance variations of the diodes and resulting undesired phase modulation in the intercarrier sound signal.
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公开(公告)号：IT8423733D0
公开(公告)日：1984-11-26
申请号：IT2373384
申请日：1984-11-26
Applicant: RCA CORP
Abstract: A multiplier for multiplying the modulated sound and picture carriers to produce an intercarrier sound signal in a quasi-parallel sound channel of an IF section has a pair of anti-parallel connected diodes in a limiter for generating an amplitude limited version of the picture carrier. It has been discovered that the varying capacitance of the diodes with picture amplitude can cause phase shifts and hence phase modulation interference in the intercarrier signal. The latter is especially troublesome for stereo sound reproduction. To reduce such interference, a low value resistor is shunt coupled to the diodes to inhibit the capacitance variations of the diodes and resulting undesired phase modulation in the intercarrier sound signal.
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公开(公告)号：FR2532502A1
公开(公告)日：1984-03-02
申请号：FR8313926
申请日：1983-08-30
Applicant: RCA CORP
Inventor： RINDAL ABRAHAM E , GRIFFIS PATRICK DOUGLAS
Abstract: A phase-locked loop (53) is provided for detecting the audio information from a television signal. A voltage controllable oscillator (VCO) (50) having a nominal oscillation frequency equal to the frequency difference between the intermediate frequency (IF) picture and sound carriers provides one input to a mixer (44) and a substantially unmodulated picture carrier is supplied as the other input to the mixer (44), which thereby provides a frequency translated output signal. A phase detector (48) has as its first input the output signal from the mixer (44) and as its second input the frequency modulated sound carrier. A lowpass filter (52) coupled between the output of the phase detector (48) and a control input to the VCO (50) completes the PLL. The detected audio information is provided at the output of the lowpass filter (52). The PLL can provide, according to another embodiment, a defect control signal which, when applied to compensation circuitry, reduces impulse noise effects in the video information.
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