Automatic color level control system with threshold tracking

Details Automatic color level control system with threshold tracking Automatic color level control system with threshold tracking

1977-07-05

1978-08-08

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9537

Patent

active

041060555

ABSTRACT:
A DC controlled amplifier is used to control the chrominance gain, and hence the color saturation, of a television receiver. The voltage on the wiper of a Color Control variable resistor and the output of an Automatic Color Level (ACL) detector are combined in a summing network to provide a DC voltage to the controlled amplifier. The ACL detector develops an output voltage that tends to maintain the peak-to-peak chrominance signal, and therefore the color saturation, at or below a threshold level. A control tracking circuit varies the threshold level in accordance with the voltage on the wiper of the color control variable resistor, thereby maintaining the dynamic range of the Automatic Color Level Control System relatively independent of the setting of the Color Control.

REFERENCES:
patent: 3732358 (1973-05-01), Harwood
patent: 3936869 (1976-02-01), Jirka
patent: 3982273 (1976-09-01), Cochran

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