Video signal processing circuit including lock-out prevention me

Details Video signal processing circuit including lock-out prevention me Video signal processing circuit including lock-out prevention me

1978-06-29

1980-06-24

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358184, 455251, 455253, H04N 552, H03G 330, H04B 116, H04N 514

Patent

active

042098050

ABSTRACT:
A video signal processing circuit adapted for use in TV receivers. The circuit includes an intermediate frequency amplifier circuit having signal amplifying transistors, a synchronous detection circuit adapted to produce the carrier signal and to produce a detection signal by making use of the reproduced carrier signal, a first gain control circuit adapted to deliver a gain control signal to the intermediate frequency amplifier circuit in accordance with the level of the detection signal and a second gain control circuit adapted to deliver a gain control signal to the intermediate frequency amplifier circuit in accordance with the level of the output from the latter. The second gain controller circuit is adapted to function to lower the gain of the intermediate frequency amplifier circuit, so as to recover the ordinary operating condition of the circuit, when the intermediate frequency amplifier circuit is undesirably locked at the full-gain condition during receiving of a broadcasting wave of a large electric field strength.

REFERENCES:
patent: 2756327 (1956-07-01), Keizer
patent: 2889400 (1959-06-01), Rogers
patent: 3251938 (1966-05-01), Ruby
patent: 3301951 (1967-01-01), Humphrey
patent: 3511930 (1970-05-01), Rupley
patent: 3665317 (1972-05-01), Crow
patent: 3838210 (1974-09-01), Peil
patent: 3898380 (1975-08-01), Wilcox

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