Non-linear comb filter for color TV receivers.

摘要

A comb filter for separating chrominance and luminance signals for each sample of a video signal adaptively selects exactly one line above or one line below for processing with the sample of interest. In the process, luminance and chrominance signals are obtained for both processing modes and coupled to a switch. Selection logic utilizes the chrominance signals established for each mode to sequentially check vertical correlation of the video signal, chrominance variations, and vertical detail to position the switch to choose the proper luminance and chrominance signal pair.