Manual and automatic ambient light sensitive picture control for

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

1987-04-23

1988-09-06

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358169, H04N 558

Patent

active

047697083

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 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.

REFERENCES:
patent: 3961281 (1976-06-01), Woolling
patent: 4451849 (1984-05-01), Fuhrer
patent: 4511921 (1985-04-01), Harlan et al.
Article "Color TV Receiver Equipped with Microprocessor Control"-W. Baum Funkschaw, 1977, pp. 763-768.

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