Automatic color saturation controller

Details Automatic color saturation controller Automatic color saturation controller

1987-02-25

1988-11-15

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 26, H04N 968

Patent

active

047853468

ABSTRACT:
An automatic color saturation controller (ACC) of synchronous detector type provides a high killer sensitivity at low field strength but a low chrominance signal stability at high field strength because the chrominance signal gain is controlled without being subjected to the influence of color burst noise. On the other hand, an ACC of peak detector type provides a high chrominance signal stability at high field strength but a low killer sensitivity at low field strength because the chrominance signal gain is directly subjected to the influence of color burst noise. In order to make the most of these two types of ACCs, the novel ACC comprises a first synchronous-detector ACC for outputting a color killer signal to a killer circuit and a second peak-detector ACC for outputting the chrominance signal to a demodulator throughout a wide field strength.

REFERENCES:
patent: 4164750 (1979-08-01), Hosoya
patent: 4415919 (1983-11-01), Miyasako
patent: 4477831 (1984-10-01), Hosoya
patent: 4546377 (1985-10-01), Kasagi

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