VIDEO SIGNAL PROCESSING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To appropriately extract luminance signals and chroma signals from video signals without the need of an A/D converter. SOLUTION: The video signal processing circuit includes: a first switched capacitor filter wherein a horizontal high-pass filter function using first video signals for one horizontal scanning period and second video signals for which the former signals are delayed and a vertical low pass filter function are combined; a second switched capacitor wherein the horizontal high-pass filter function using the second video signals and third video signals for which the former signals are delayed and the vertical low pass filter function are combined; first and second comparators for outputting a first correlation degree between the first and second video signals and a second correlation degree between the second and third video signals by the size comparison of each output of the first and second switched capacitor filters; and a Y/C separation circuit for separating the video signals into the luminance signals and the chroma signals using the first and second video signals or the second and third video signals on the basis of the first and second correlation degrees. COPYRIGHT: (C)2009,JPO&INPIT