Comb filter apparatus for video playback systems

Details Comb filter apparatus for video playback systems Comb filter apparatus for video playback systems

1975-12-29

1976-12-07

Safourek, Benedict V.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 8, H04N 902

Patent

active

039966100

ABSTRACT:
Comb filter apparatus for separating interleaved luminance and chrominance components of a composite color video signal employs a clock controlled delay line of the CCD type to which the composite signal is applied. A VCO supplies clock signals to the CCD delay line, and to a frequency divider. The output of the frequency divider is compared in phase with a color synchronizing component of the undelayed composite color video signal to develop an error signal, which is applied to the VCO in a sense opposing departures from a predetermined phase relationship between the divider output and the synchronizing component. Spurious frequency variations of composite signal components (e.g., accompanying recovery of composite signal by playback of a video disc) are followed by the VCO in a manner assuring that accurate combing of the composite signals occurs at the outputs of circuits providing desired combinations of the delay line input and output.

REFERENCES:
patent: 3580991 (1971-05-01), Krause
patent: 3674920 (1972-07-01), Faroudja
patent: 3871020 (1975-03-01), Wilber

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