Signal-dependent chrominance subcarrier filtering circuit

Details Signal-dependent chrominance subcarrier filtering circuit Signal-dependent chrominance subcarrier filtering circuit

1977-09-02

1979-04-10

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

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358 39, H04N 9535

Patent

active

041491815

ABSTRACT:
A method and circuit for detecting and removing chrominance signal components from the luminance channel of a television receiver is shown. The luminance channel is separated into distinct subchannels, one of which has a filter providing attenuation at the chrominance subcarrier frequency. A detection circuit operates to select the output of the filtered subchannel whenever a chrominance subcarrier signal appears in the luminance channel. The detection circuit is sensitive to the phase relationship between the chrominance signal and a portion of the luminance signal and is therefore substantially immune to signals other than chrominance subcarriers, including high frequency components of the luminance signal.

REFERENCES:
patent: 3938179 (1976-02-01), Amery
patent: 3969757 (1976-07-01), Amery

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