Pal identification circuit

Details Pal identification circuit Pal identification circuit

H - Electricity

04

N

350/72

H04N 9/465 (2006.01)

Patent

CA 1107853

RCA 71,473 PAL SWITCHING CONTROL CIRCUIT Abstract of the Invention In a PAL color television system for processing a color signal including burst and chrominance components alternating in phase at the image line scanning rate, identification and control circuitry for rapidly correcting an incorrect mode of line to line color demodulator switching. A bistable circuit generates timing signals for controlling line by line switching of a selected color demodulator (e.g., R-Y). An identification signal repre- sentative of an incorrect line switching mode is derived from information contained in the burst component, and serves to reset the bistable circuit such that timing signals corresponding to a correct switching mode are produced. The identification signal is derived by a filter circuit exhibiting a fast response time relative to the line scanning time, in order to rapidly respond to the switching mode identification information occurring at the line rate and thereby rapidly restore the correct demodulator switching mode.

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