| 摘要 |
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. |
