Y/C separator circuit for separating luminance and chrominance s

Details Y/C separator circuit for separating luminance and chrominance s Y/C separator circuit for separating luminance and chrominance s

1988-06-02

1989-08-29

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 39, H04N 978

Patent

active

048622524

ABSTRACT:
A Y/C separator circuit for separating the luminance and chrominance signals from a color composite video signal includes a comb filter, a filter circuit for extracting an ac component of the luminance signal, an ac component detecting circuit for detecting the level of the ac component of luminance signal and generating an ac component detection signal when the level of the ac component of the luminance signal exceeds a predetermined level, signal leakage detection circuit for detecting a leakage signal between the luminance signal and the chrominance signal on the basis of a difference between information signals of the color composite video signal in adjacent two horizontal scanning periods, and generating a leakage detection signal. The levels of components of the luminance signal in a chroma signal frequency band is reduced in response to an operation command signal when the leakage detection signal is present and the ac component detection signal is absent, thereby alleviating the degradation of the luminance signal.

REFERENCES:
patent: 4694331 (1987-09-01), Law et al.
patent: 4703342 (1987-10-01), Takahashi
patent: 4750033 (1988-06-01), Fukuda et al.

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