Noise suppressing circuit with gain control

Details Noise suppressing circuit with gain control Noise suppressing circuit with gain control

1986-09-02

1988-08-30

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358340, H04N 521

Patent

active

047680946

ABSTRACT:
To suppress noise included in a video signal, the noise level is detected by a noise level detecting circuit which operates only within blanking period; and the noise level is suppressed through control of a gain control circuit in accordance with an output signal from the noise level detecting circuit. The gain control circuit may be a voltage controlled variable gain amplifier interposed between a limiter and a subtractor of an in-line noise supressing circuit. A vertical correlation noise canceller may also be combined so that a gain control circuit interposed between a limiter and a subtractor is also controlled.

REFERENCES:
patent: 4302768 (1981-11-01), Kamura
patent: 4563704 (1986-01-01), Hirota

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