DC restorer with reduced low frequency noise

Details DC restorer with reduced low frequency noise DC restorer with reduced low frequency noise

1992-02-10

1993-11-02

Powell, Mark R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358177, H04N 518

Patent

active

052588424

ABSTRACT:
A video signal processing circuit includes a separating circuit for separating a sync. signal of a video signal, a sample-and-hold circuit for subjecting a d.c. reference portion of the video signal to a sample-and-hold operation in response to the separated sync. signal, and a superimposing circuit for reversing the polarity of the d.c. reference voltage subjected to the sample-and-hold operation and superimposing it on the video signal to eliminate an unnecessary fluctuation component of the video signal. The separation of the sync. signal by the sync. separating circuit is performed on the basis of the video signal from which the unnecessary fluctuation component is eliminated by the superimposing circuit.

REFERENCES:
patent: 3947631 (1976-03-01), Rhee et al.
patent: 4998170 (1991-03-01), Nohara

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