Stabilized video signal control loop

Details Stabilized video signal control loop Stabilized video signal control loop

H - Electricity

04

N

350/47, 350/83

H04N 5/16 (2006.01) H04N 5/18 (2006.01)

Patent

CA 1175559

-14- RCA 77,258 ABSTRACT OF THE DISCLOSURE 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.

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