H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/37, 352/33.1
H04N 5/76 (2006.01) G11B 23/00 (2006.01) H04N 5/91 (2006.01) H04N 9/882 (2006.01)
Patent
CA 1048631
Abstract of the Disclosure In a video disc player, a first FM signal recovered from the disc is subject to frequency demodulation to obtain a composite color video signal, and a second FM signal recovered from the disc is also demodulated to obtain an accompanying sound signal. The player includes a defect detector, monitoring the first FM signal to identify carrier, monitoring the first FM signal to identify carrier frequency departures from the intended deviation range, and switching apparatus for effecting a substitution of stored video signals, in replacement of the output of the video FM detector, when the defect detector identifies such departures. A squelch control signal generator is rendered responsive 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 inhibit the passage of sound and video signals to player output terminals. The squelch control signal generator is addition- ally rendered responsive to player apparatus controlling placement of the player stylus in and out of playback position (e.g., controlling lowering/lifting of stylus arm), so that removal of stylus from playback position initiates squelch signal development without need for passage of said predetermined minimum length of time.
238654
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