FM Signal demodulator with defect detection

Details FM Signal demodulator with defect detection FM Signal demodulator with defect detection

1978-10-02

1980-05-13

Cook, Daryl W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 8, 360 38, H04N 576, H04N 578

Patent

active

042031346

ABSTRACT:
In the playback of a video disc record employing an FM carrier recording format, a defect compensation system is provided which substitutes delayed video signals for current video signals when a defect is encountered. A phase locked loop including a phase detector and a voltage controlled oscillator is employed in FM detection circuits. A defect detector compares the phase between the oscillator output signal and a signal corresponding to the recovered signal. When the phase difference between these two signals exceeds a certain value, a defect signal is generated to disable the normal signal path of the recovered signal so that the delayed version of the video may be substituted for the current video for the duration of the occurrence of the defect.

REFERENCES:
patent: 3967311 (1976-01-01), Fuhrer
patent: 3969759 (1976-07-01), Amery
patent: 4000511 (1976-12-01), Kenney
patent: 4001496 (1977-01-01), Clemens et al.
patent: 4017892 (1977-04-01), Takahara et al.
patent: 4038686 (1977-07-01), Baker

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