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公开(公告)号：KR800001018B1
公开(公告)日：1980-09-22
申请号：KR760000590
申请日：1976-03-10
Applicant: RCA CORP
Inventor： BAKER A
IPC: H04N5/76
Abstract: A defect detector suitable for use in playback of a video record employing an FM carrier recording format is composed of a zero-crossing detector(20) for developing output pulses indicative of the zero-crossing of the signal developed by the pick up ccts., a monostable multivibrator(25) responsive to the output pulses of the zero-crossing detector, a low pass filter(27) coupled to receive an output of the multivibrator, means for utilizing the output of the low pass filter to control the display of images and means(68) for developing a delayed version of an output pulse of the multivibrator.
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公开(公告)号：KR800000658B1
公开(公告)日：1980-07-12
申请号：KR750002512
申请日：1975-11-18
Applicant: RCA CORP
Inventor： BAKER A
IPC: H04N9/12
Abstract: A sync responsive system for video disc players comprises a pick-up apparatus(10) for reproducing the color image signal component and deflection synchronizing component, freq. de-modulating means(40,50) for responding to the carrier wave output, a comb-filter(150) having the freq. response characteristic of nulls, a de-emphasis circuit for responding to the comb-filter output signal and having the reverse responding characteristic between output freq., and a responding apparatus(340).
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公开(公告)号：KR800000289B1
公开(公告)日：1980-04-10
申请号：KR750002511
申请日：1975-11-18
Applicant: RCA CORP
Inventor： BAKER A
IPC: H04N5/76
Abstract: In a video disc player, a first and second FM signals recovered from the disc are demodulated to obtain a composite color video signal and an accompanying sound signal, resp. A squelch control signal generator is rendered to an output of the defect detector, and develops a squelch signal when the defect indication persists beyond a predetermined minimum length of time. The squelch signal is employed to control the passage of sound and video signals to player output terminals.
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公开(公告)号：ZA757082B
公开(公告)日：1976-10-27
申请号：ZA757082
申请日：1975-11-11
Applicant: RCA CORP
Inventor： BAKER A
Abstract: Video disc player pickup circuit recovers picture information in the form of carrier waves, the instantaneous frequency of which varies over a given deviation range in accordance with the amplitude of composite color video signals, in the course of pickup tracking of successive convolutions of the disc record's groove. Succeeding the innermost groove convolution containing recorded picture information are a plurality of groove convolutions containing an end-of-recording signal comprising unmodulated carrier waves at a given instantaneous frequency within said deviation range. Signal processing circuitry of the video disc player includes a sync separator for separating a deflection synchronizing component from the composite color video signals recovered during playback of the groove convolutions containing picture information. Video disc player also includes a defect detector monitoring carrier frequency departures from the given deviation range, and a squelch signal generator responsive to the output of the defect detector. An end-of-play signal generator responds to the continuance for a given time interval of a simultaneous absence of outputs from sync separator and squelch signal generator by generating an end-of-play signal, which is utilized to terminate record playback efforts and to restore pickup apparatus to a rest position.
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