Manual and automatic ambient light sensitive picture control...

Details Manual and automatic ambient light sensitive picture control... Manual and automatic ambient light sensitive picture control...

H - Electricity

04

N

350/82

H04N 5/58 (2006.01)

Patent

CA 1262491

Abstract In a television receiver, a contrast control signal for controlling the amplitude of a video signal is a function of a manual contrast control component provided by a viewer, and an automatic contrast control component provided by a light sensitive circuit responsive to ambient light conditions. A "soft" limiter limits the value of the control signal to prevent a displayed image from being extinguished due to excessive video signal attenuation in response to the control signal. The manual control component is provided by means including a duty cycle control device such as a binary rate multiplier or pulse width modulator.

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