Video signal DC restoration circuit

Details Video signal DC restoration circuit Video signal DC restoration circuit

1983-11-07

1985-10-22

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 34, 358171, 328150, 307264, H04N 516, H04N 506

Patent

active

045492140

ABSTRACT:
In a wideband video signal processing system, video output signals from a video driver amplifier are passively AC coupled to an intensity control electrode of an image display device. A keyed feedback DC restoration circuit is connected to the intensity control electrode via a high impedance resistor network comprising the feedback path of the restoration circuit. Image brightness control is accomplished via the restoration circuit without varying the operating point of the driver amplifier.

REFERENCES:
patent: 2718550 (1955-09-01), Hoyt et al.
patent: 2825758 (1958-03-01), Revercomb
patent: 2873314 (1959-02-01), Avins
patent: 3647944 (1972-03-01), Anderson
patent: 4082996 (1978-04-01), Hinn
patent: 4285008 (1981-08-01), Osawa et al.
patent: 4442458 (1984-04-01), Barter
Milton S. Kiver, Modern Television Receiver, Mar., 1949, pp. 66-72, 138-140.
Oliver K. Allen, A Simple Inexpensive DC Restorer, Apr., 1961, pp. 200-202.
Copending U.S. patent application Ser. No. 532,333 of Robert L. Rodgers, III, titled "Brightness Control Network in a Video Signal Processor with A.C. Coupled Output Stages".

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