Signal gain control with DC compensation

Details Signal gain control with DC compensation Signal gain control with DC compensation

1981-08-27

1983-03-08

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358169, 358 34, H04N 516

Patent

active

043762883

ABSTRACT:
The DC output level of a video signal amplifier is compensated to remain constant as the amplifier is gain controlled in response to a gain control voltage supplied from a gain control circuit which also supplies a DC compensation voltage to the amplifier. The DC compensation is preserved by means of an additional network which senses the DC bias of both the amplifier and the gain control circuit, and corrects a deviation of the amplifier bias and the gain control circuit bias from a prescribed mutual relationship. The sensed DC bias of the gain control circuit is also used to establish a black reference level for the video signal.

REFERENCES:
patent: 3737796 (1973-06-01), Legler
patent: 3804981 (1974-04-01), Avins
patent: 3873767 (1975-03-01), Okada et al.
patent: 4013972 (1977-03-01), Nishitoba et al.
patent: 4197557 (1980-04-01), Tuma et al.
patent: 4209808 (1980-06-01), Harwood
patent: 4253110 (1981-02-01), Harwood et al.

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