H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/63
H04N 9/12 (2006.01) H04N 9/78 (2006.01) H04N 9/85 (2006.01) H04N 9/893 (2006.01)
Patent
CA 1078505
COMB FILTER APPARATUS FOR VIDEO PLAYBACK SYSTEMS Abstract of the Disclosure 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., accompany- ing 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. -1-
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