Straylight compensation circuit and blanking circuit for same

Details Straylight compensation circuit and blanking circuit for same Straylight compensation circuit and blanking circuit for same

1975-06-24

1977-01-04

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

178DIG26, 358171, 358221, H04N 516

Patent

active

040015025

ABSTRACT:
A straylight compensation circuit which corrects for excessive dark current features a blanking circuit to ensure a stable black level without spikes and blanking noise. The video is integrated to provide a measure of the average picture level and is added to a reference level to compare with the blanking level in the original signal. The blanking circuit has a differential amplifier with diodes to ensure a correct and stable black level without noise or spikes.

REFERENCES:
patent: 2353018 (1944-07-01), Duke
patent: 3339018 (1967-08-01), Brown
patent: 3619648 (1971-11-01), Wolber
patent: 3737571 (1973-06-01), Gaebele
patent: 3750038 (1973-07-01), Meise
patent: 3860751 (1975-01-01), Schneider

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