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公开(公告)号：DE3043672A1
公开(公告)日：1981-08-27
申请号：DE3043672
申请日：1980-11-19
Applicant: RCA CORP
Inventor： WILBER JAMES ALBERT , CHRISTOPHER TODD J , KELLEHER KEVIN CHARLES
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公开(公告)号：PL228598A1
公开(公告)日：1981-08-21
申请号：PL22859880
申请日：1980-12-19
Applicant: RCA CORP
Inventor： MCGUFFIN WILLIAM G , CHRISTOPHER TODD J
Abstract: To provide control signals allowing compensation of stylus tracking in eccentric grooves of a video disc 10, a stylus 11 carries an electrode 13 disposed between first and second electrodes 14, 15 fixedly mounted on a motor driven carriage 8 to which stylus 11 is compliantly mounted. The capacitances of the variable capacitors thus formed vary with the displacement of electrode 13, and hence of stylus 11, relative to carriage 8. In Figure 1, complementary a.c. signals V1, V2 are applied to electrodes 14, 15 so that the algebraic sum of these signals capacitively coupled to electrode 13 is indicative of the position of the stylus. The output signal V3 from electrode 13, via processing circuit 29, controls a motor 31 to move carriage 8 so as to restore electrode 13, and thus the stylus 11, to a null position. In Figure 8 (not shown), an a.c. signal which has been amplitude modulated by voltage variable impedances is applied to the first and second electrodes whereby the time average of the signal summed at the stylus related electrode is indicative of the stylus position.
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公开(公告)号：FI803867L
公开(公告)日：1981-06-21
申请号：FI803867
申请日：1980-12-12
Applicant: RCA CORP
Inventor： MCGUFFIN WILLIAM GEORGE , CHRISTOPHER TODD J
Abstract: To provide control signals allowing compensation of stylus tracking in eccentric grooves of a video disc 10, a stylus 11 carries an electrode 13 disposed between first and second electrodes 14, 15 fixedly mounted on a motor driven carriage 8 to which stylus 11 is compliantly mounted. The capacitances of the variable capacitors thus formed vary with the displacement of electrode 13, and hence of stylus 11, relative to carriage 8. In Figure 1, complementary a.c. signals V1, V2 are applied to electrodes 14, 15 so that the algebraic sum of these signals capacitively coupled to electrode 13 is indicative of the position of the stylus. The output signal V3 from electrode 13, via processing circuit 29, controls a motor 31 to move carriage 8 so as to restore electrode 13, and thus the stylus 11, to a null position. In Figure 8 (not shown), an a.c. signal which has been amplitude modulated by voltage variable impedances is applied to the first and second electrodes whereby the time average of the signal summed at the stylus related electrode is indicative of the stylus position.
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公开(公告)号：FR2470489A1
公开(公告)日：1981-05-29
申请号：FR8024425
申请日：1980-11-18
Applicant: RCA CORP
Inventor： WILBER JAMES ALBERT , CHRISTOPHER TODD J , KELLEHER KEVIN CHARLES
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公开(公告)号：DE3038357A1
公开(公告)日：1981-04-23
申请号：DE3038357
申请日：1980-10-10
Applicant: RCA CORP
Inventor： DIETERICH CHARLES BENJAMIN , CHRISTOPHER TODD J
IPC: G11B5/09 , G11B20/10 , G11B20/18 , G11B27/10 , G11B27/30 , G11B27/34 , H04N5/76 , H04N5/92 , H04N9/79 , H04N9/82 , H04N5/91
Abstract: In a video disc system wherein each data field includes, as well as a video signal, a predetermined digital start code followed by a digital error code and digital information bits, the error code is a polynomial division code chosen so that for each data field an error code remainder register in the video disc player initially contains the predetermined start code rather than zero, and/or, if no errors are detected, finally contains the predetermined start code rather than zero. An arrangement is also described which, in response to the reading of a particular sequence of data from the disc indicating the end of the record, disables the read head.
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Patent Agency Ranking
公开(公告)号：DE3031466A1
公开(公告)日：1981-03-26
申请号：DE3031466
申请日：1980-08-20
Applicant: RCA CORP
Inventor： PYLES GERALD DEE , WILBER JAMES ALBERT , CHRISTOPHER TODD J
IPC: G11B3/00 , G11B7/00 , G11B7/004 , G11B9/06 , G11B20/02 , G11B21/03 , G11B27/36 , H04B1/10 , H04N5/93 , H04N5/781
Abstract: A squelch circuit responsive to a squelch signal mutes audio and video circuits in a video disc player, preconditions a video signal correction servo system to the center of its control range and inhibits a defect correction circuit. A squelch memory, set by the simultaneous occurrence of the squelch signal and a loss of carrier signal derived from the output of the player pickup transducer, maintains the muting, preconditioning and inhibiting functions. When the squelch signal terminates the squelch memory is reset upon subsequent termination of the loss of carrier signal whereby the audio and video circuits are immediately unmuted, stabilization is rapidly established by the preconditioned video signal correction servo system and the defect correction circuit is primed.
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公开(公告)号：FR2464004A1
公开(公告)日：1981-02-27
申请号：FR8018153
申请日：1980-08-19
Applicant: RCA CORP
Inventor： PYLES GERALD DEE , WILBER JAMES ALBERT , CHRISTOPHER TODD J
IPC: G11B3/00 , G11B7/00 , G11B7/004 , G11B9/06 , G11B20/02 , G11B21/03 , G11B27/36 , H04B1/10 , H04N5/93 , H04N5/91
Abstract: A squelch circuit responsive to a squelch signal mutes audio and video circuits in a video disc player, preconditions a video signal correction servo system to the center of its control range and inhibits a defect correction circuit. A squelch memory, set by the simultaneous occurrence of the squelch signal and a loss of carrier signal derived from the output of the player pickup transducer, maintains the muting, preconditioning and inhibiting functions. When the squelch signal terminates the squelch memory is reset upon subsequent termination of the loss of carrier signal whereby the audio and video circuits are immediately unmuted, stabilization is rapidly established by the preconditioned video signal correction servo system and the defect correction circuit is primed.
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公开(公告)号：FR2464002A1
公开(公告)日：1981-02-27
申请号：FR8018152
申请日：1980-08-19
Applicant: RCA CORP
Inventor： CHRISTOPHER TODD J , WILBER JAMES ALBERT
Abstract: Periodic biasing of video disc player signal correction servo to the center of its control range avoids the loss-of-loop gain which otherwise could occur if the servo were continuously biased and minimizes loop stabilization time. Periodic biasing is provided by means of a timing circuit, responsive to a luminance signal transition above blanking level, which enables the servo phase error detector and simultaneously enables a precharging circuit which charges the servo error voltage holding capacitor to a level corresponding to a zero error servo condition. The timing circuit disables the precharging circuit a predetermined time subsequent to an opposite transition of the luminance signal and disables the phase detector subsequent to disabling of the precharging circuit. The period between disabling of the precharging circuit and disabling of the phase detector encompasses the color burst interval of the horizontal sync pulse and may be controlled by selection of offset and slope parameters of an integrator in the timing circuit.
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公开(公告)号：IT8026681D0
公开(公告)日：1980-12-16
申请号：IT2668180
申请日：1980-12-16
Applicant: RCA CORP
Inventor： MCGUFFIN WILLIAM GEORGE , CHRISTOPHER TODD J
Abstract: To provide control signals allowing compensation of stylus tracking in eccentric grooves of a video disc 10, a stylus 11 carries an electrode 13 disposed between first and second electrodes 14, 15 fixedly mounted on a motor driven carriage 8 to which stylus 11 is compliantly mounted. The capacitances of the variable capacitors thus formed vary with the displacement of electrode 13, and hence of stylus 11, relative to carriage 8. In Figure 1, complementary a.c. signals V1, V2 are applied to electrodes 14, 15 so that the algebraic sum of these signals capacitively coupled to electrode 13 is indicative of the position of the stylus. The output signal V3 from electrode 13, via processing circuit 29, controls a motor 31 to move carriage 8 so as to restore electrode 13, and thus the stylus 11, to a null position. In Figure 8 (not shown), an a.c. signal which has been amplitude modulated by voltage variable impedances is applied to the first and second electrodes whereby the time average of the signal summed at the stylus related electrode is indicative of the stylus position.
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公开(公告)号：PL220123A1
公开(公告)日：1980-09-22
申请号：PL22012379
申请日：1979-12-04
Applicant: RCA CORP
Inventor： CHRISTOPHER TODD J , TRETTER LARRY L R
Abstract: In a video processing system including comb filters for separating interleaved luminance and chrominance components, the time of occurrence of the color synchronizing component of the composite color video signal is detected after the comb filtering and separating of the luminance and chrominance components. The composite signal components include spurious frequency variations which accompany the composite signal during playback from a video disc. A first phase locked loop coupled to a frequency translator is used to remove the spurious frequency variations from the separated and frequency translated chrominance components. A second phase locked loop is connected between a second frequency translator and a clock controlled delay line. The second phase locked loop tracks the spurious frequency variations in a manner to assure that accurate combing of the component signals occurs at the output of the comb filters. The same reference frequency is used in the first phase locked loop as well as in the second frequency translator.
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