Carrier chrominance signal processing circuit

Details Carrier chrominance signal processing circuit Carrier chrominance signal processing circuit

1986-09-09

1988-08-23

McElheny, Jr., Donald

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 31, 358329, H04N 987

Patent

active

047664860

ABSTRACT:
A carrier chrominance signal processing circuit for use in an apparatus such as a video tape recorder is based upon a feedback comb filter for enhancing the S/N ratio of the playback carrier chrominance signal, and circuits for detecting vertical coherence in a playback luminance signal and carrier chrominance signal respectively. Loop feedback within the feedback comb filter is controlled in accordance with a plurality of specific combinations of conditions of vertical coherence and vertical non-coherence of the carrier chrominance signal and luminance signal, such as to minimize vertical color blurring being produced by the operation of the feedback comb filter while effectively suppressing noise components in the playback carrier chrominance signal.

REFERENCES:
patent: 4263612 (1981-04-01), Gibson et al.
patent: 4513311 (1985-04-01), Hirai et al.
patent: 4558353 (1985-12-01), Hirota
patent: 4636863 (1987-01-01), Kaizaki et al.
patent: 4677486 (1987-06-01), Noda et al.

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