Automatic gain control device for video signals

Details Automatic gain control device for video signals Automatic gain control device for video signals

1988-02-12

1989-06-06

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 552

Patent

active

048376256

ABSTRACT:
An automatic gain control device for video signals in the form of an integrated circuit uses a loop comprising comparators (3, 4) for comparing the video signal to various thresholds. Up-down counters and driving circuit (5) up-down the comparison output signals, so that, in connection with the comparators output signals, different time constants are obtained to control the gain of an input circuit.

REFERENCES:
patent: 4472707 (1984-09-01), Wilensky
patent: 4745411 (1988-05-01), Barnhart
Rehfeldt, "A Multistandard Chip Set for VHS VCRS", IEEE Transactions on Consumer Electronics, vol. CE-30, No. 3, (Aug., 1984), pp. 382-389.
Catto, "Video AGC Reacts at TV Field Rate", Electronic Engineering, vol. 56, No. 686, (Feb., 1984):32.

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