Stabilized video signal control loop

Details Stabilized video signal control loop Stabilized video signal control loop

1981-08-27

1983-02-01

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 518

Patent

active

043718965

ABSTRACT:
Input video signals are applied to a video signal processor via an AC coupling capacitor and an input impedance. A gated control circuit operates periodically to develop a DC control voltage for establishing the DC black reference level of the video signal, at which time the control circuit forms a feedback loop with the video processor. The DC feedback control voltage is coupled via a feedback impedance to the AC coupling capacitor, which stores the control voltage, at the video processor input. The AC coupling capacitor exhibits a low impedance at signal frequencies, such that the input and feedback impedances form a voltage divider for sufficiently reducing the AC signal gain of the feedback loop to prevent the feedback control loop from oscillating at AC signal frequencies.

REFERENCES:
patent: 3207998 (1965-09-01), Corney et al.
patent: 3309615 (1967-03-01), Baldwin et al.
patent: 3543169 (1970-11-01), Hill
patent: 3959733 (1976-05-01), Solomon et al.
patent: 3996609 (1976-12-01), Avery
patent: 4105942 (1978-08-01), Henry
patent: 4197557 (1980-04-01), Tuma et al.

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