Circuit for stabilizing the black level in an output signal of a

Details Circuit for stabilizing the black level in an output signal of a Circuit for stabilizing the black level in an output signal of a

1978-10-03

1980-11-04

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358221, H04N 907, H04N 516

Patent

active

042323312

ABSTRACT:
A circuit for stabilizing the black level in an output signal of a camera tube is employed in a color television camera. The camera tube has an optical filter with an optically black part extending in parallel with a beam scanning direction of the camera tube. The stabilizing circuit comprises a clamping circuit for clamping an output signal of the camera tube during a horizontal beam blanking period and for restoring a DC component of the output signal. A circuit responds to supplied sampling pulses during every vertical scanning period, for sampling and holding an output signal of the clamping circuit. A circuit feeds back a substantially negative holding voltage of the sampling and holding circuit, to the clamping circuit.

REFERENCES:
patent: 3558809 (1971-01-01), Aoki
patent: 3584146 (1971-06-01), Cath et al.
patent: 3602641 (1971-08-01), Heise
patent: 3737571 (1973-06-01), Gaebele et al.
patent: 3839669 (1974-10-01), Infante et al.

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