Color saturation and contrast control circuitry responsive to am

Details Color saturation and contrast control circuitry responsive to am Color saturation and contrast control circuitry responsive to am

1975-05-12

1976-09-28

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

178 75DC, 358 39, H04N 9535, H04N 558

Patent

active

039835758

ABSTRACT:
A control circuit used in a color television receiver for controlling a reproduced picture in response to an ambient light level has a photo-sensitive device, a transistor whose base electrode is connected to the photo-sensitive device, a variable resistor connected in series to the transistor, a voltage controlled contrast control circuit and a voltage controlled color saturation control circuit both controlled by a control voltage obtained at a movable contact of said variable resistor, and a switch connected in parallel to the transistor which is adapted to be manually closed.

REFERENCES:
patent: 3813686 (1974-05-01), Mierzwinski
patent: 3814852 (1974-06-01), Mierzwinski

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