Color correction circuit for a color television receiver

Details Color correction circuit for a color television receiver Color correction circuit for a color television receiver

H - Electricity

04

N

350/59

H04N 9/12 (2006.01) H04N 9/64 (2006.01) H04N 17/04 (2006.01)

Patent

CA 1073094

SO955 COLOR CORRECTION CIRCUIT FOR A COLOR TELEVISION RECEIVER ABSTRACT OF THE DISCLOSURE A color correction circuit responsive to a VIR signal that includes a clamping circuit to clamp a color demodulated signal to a predetermined voltage level during the chrominance reference portion of the VIR signal. A sample-and-hold circuit samples the luminance reference portion of the VIR signal im- mediately succeeding the clamped portion and holds the sampled value, and a comparator compares the sampled signal with the predetermined clamping voltage to generate an error-correction voltage that can be applied to a gain-control amplifier in the chrominance channel to correct saturation and to a phase-control circuit to adjust the hue by shifting the phase of the locally generated subcarrier.

287533

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