Luminance/chrominance signal separating apparatus which attenuat

Details Luminance/chrominance signal separating apparatus which attenuat Luminance/chrominance signal separating apparatus which attenuat

1993-08-23

1994-10-11

Powell, Mark R.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348666, H04N 978

Patent

active

053551761

ABSTRACT:
A comb filter separates a luminance signal and chrominance signal from a composite video signal, a phase calculation circuit calculates a phase delay of the chrominance signal, at least one delay circuit delays an output signal of the phase calculation circuit, a phase difference calculation circuit calculates a difference between an output signal of the phase calculation circuit and an output signal of the delay circuit, and a chrominance signal correction circuit attenuates the chrominance signal in response to an output signal of the phase difference calculation circuit. The chrominance signal having crosstalk from the luminance signal is suppressed to prevent the generation of cross color.

REFERENCES:
patent: 4706112 (1987-11-01), Faroudja et al.
patent: 4847683 (1989-07-01), Lang
patent: 4951128 (1990-08-01), Miyake
patent: 5019895 (1991-05-01), Yamamoto et al.
patent: 5249040 (1993-09-01), Sugiyama

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