Brightness control circuit

Details Brightness control circuit Brightness control circuit

1981-08-27

1983-09-13

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358172, H04N 514

Patent

active

044045930

ABSTRACT:
An image brightness control circuit is included in a television receiver which also includes a video signal black level clamp comprising a charge storage capacitor. The clamp operates during video signal blanking intervals, between picture intervals, for establishing a video signal black reference level. A variable brightness control voltage is applied to the clamp-controlled video signal only during picture intervals of the video signal. Brightness control is thereby achieved without introducing a visible gradual change in the brightness of a reproduced image, which would otherwise be produced by the action of the clamp charging or discharging the storage capacitor.

REFERENCES:
patent: 3598913 (1971-08-01), Janssen
patent: 4197557 (1980-04-01), Tuma et al.
patent: 4967048 (1978-01-01), Norman

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