DC Restoration circuit for television receiver

Details DC Restoration circuit for television receiver DC Restoration circuit for television receiver

1980-02-04

1981-10-06

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358171, 358 34, H04N 518

Patent

active

042938740

ABSTRACT:
A DC restoration circuit for an AC coupled television receiver includes means for converting an input video voltage signal to a corresponding video current signal and for abstracting from the video current signal a DC current feedback signal, the remaining video current signal being reconverted to a corresponding output video voltage having a DC voltage component. A feedback loop including a clamp capacitor is operable during the back porch of the horizontal blanking interval for establishing the level of the DC current feedback signal to equalize the values of the DC component of the output video voltage and a black level reference voltage derived from a manually operable brightness control.

REFERENCES:
patent: 3582545 (1971-06-01), Thorpe
patent: 3985954 (1976-10-01), Kuniyoshi et al.

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