A.G.C. circuit for a video signal

Details A.G.C. circuit for a video signal A.G.C. circuit for a video signal

1975-07-01

1976-09-14

Richardson, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

H04N 552

Patent

active

039808165

ABSTRACT:
An automatic gain control circuit for a video signal amplifier to integrate the synchronizing pulse portion of the composite signal and apply the integrated signal to a pulse generating circuit to generate a pulse each time the integrated signal exceeds a certain level. The pulse, which has a fixed magnitude, is added to the amplified video signal in the same polarity relative to the blanking level as the luminance signal. A control circuit measures the peak-to-peak value of the combined signal and generates a controlling signal having a magnitude that varies with changes in the peak value and is used to control the gain of the amplifier.

REFERENCES:
patent: 2885472 (1959-05-01), Billin et al.
patent: 3524021 (1970-08-01), Hickok

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