Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

1986-06-16

1987-05-19

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 552

Patent

active

046672427

ABSTRACT:
An automatic gain control (AGC) circuit for performing an AGC for a picture signal. The AGC circuit includes an amplifier for amplifying the picture signal, a clamping circuit for fixing a tip-end level of a synchronous signal component of the picture signal, a synchronous detection AGC loop constituted of the amplifier, the clamping circuit, a synchronous detection circuit and a first filter, a peak detection AGC loop constituted of the amplifier, the clamping circuit, a peak detection circuit and a second filter, and a precharging means connected between the first filter and the second filter for charging the second filter by a voltage followed to a voltage charged on the first filter when the synchronous detection AGC loop is activated but the peak detection AGC loop is deactivated.

REFERENCES:
patent: 3569620 (1971-03-01), Baun
patent: 4204229 (1980-05-01), Heuze
"Electrical/Electronics Engineering Encyclopedia" vol. 25, Nov. 1983, pp. 318-319, Editor: Shigeo Tsuji.

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