Color saturation and contrast control circuitry responsive...

Details Color saturation and contrast control circuitry responsive... Color saturation and contrast control circuitry responsive...

H - Electricity

04

N

350/61

H04N 9/12 (2006.01) H04N 5/58 (2006.01) H04N 9/68 (2006.01)

Patent

CA 1049137

ABSTRACT OF THE DISCLOSURE An 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 transis- tor a base electrode of which is connected to the photo-sen- sitive device, a variable resistor connected to the tran- sistor in series 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 commonly, a switch connected to the transistor in parallel which is closed in a manual condition.

226967

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