One-chip chroma/luma IC: D.C. coupling reduction circuit

Details One-chip chroma/luma IC: D.C. coupling reduction circuit One-chip chroma/luma IC: D.C. coupling reduction circuit

1980-12-15

1982-07-06

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 518

Patent

active

043386300

ABSTRACT:
A DC coupling reduction circuit for use in a television receiver having a DC restoration circuit comprises means for developing a dynamic adjustment signal by attenuating a video signal by a selected percentage, inverting the attenuated signal and low pass filtering the attenuated and inverted signal. The dynamic adjustment signal is combined with a viewer selected direct current black level reference signal to produce a combined signal which is coupled to the black clamp level determining input of the DC restoration circuit whereby the black level of the video signal is clamped at a potential which is a function of the video signal. Preferably, the cut-off point of the cathode ray tube of the television receiver is set at a level between the levels of the combined signals produced in response to a video signal representing a white image and a video signal representing a black image.

REFERENCES:
patent: 4110790 (1978-08-01), Wheeler
patent: 4237489 (1980-12-01), Kresock
IEEE Transactions on Consumer Electronics, vol. CE-24, No. 3, Aug. 1978, Kenneth R. Skinner, William A. Cocke.

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