Vertical aperture correction circuit

Details Vertical aperture correction circuit Vertical aperture correction circuit

H - Electricity

04

N

350/42

H04N 9/04 (2006.01) H04N 5/208 (2006.01)

Patent

CA 1147848

SO1366 VERTICAL APERTURE CORRECTION CIRCUIT ABSTRACT OF THE DISCLOSURE A video signal, such as may be generated by a television camera, is subjected to a delay, and then com- bined with a relatively undelayed version thereof, the combined signal being supplied to a clipping circuit, which passes at least that portion thereof that exceeds a predetermined clipping level, and also to a slicing circuit, which passes at least that portion thereof that is less than the predetermined clipping level. A mixing circuit mixes the video signal with the outputs of the clipping and slicing circuits, thereby to provide a vertical aperture-corrected output video signal which is substantially free of periodic fluctuations that might be present in the amplitude of the original video signal. A preferred use of this vertical aperture correction circuit is with a color image pickup device of the type which generates a video signal having a superimposed periodic, fluctuating index signal thereon that produces a line-crawling effect in the ultimately produced video picture.

367207

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