Clamping apparatus for a video signal

Details Clamping apparatus for a video signal Clamping apparatus for a video signal

1984-11-27

1987-03-17

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358171, H04N 518

Patent

active

046512136

ABSTRACT:
A feedback clamping circuit for producing a drift error free digital signal from an input analog video signal. The circuit includes a differential amplifier which receives the input analog signal and an error signal. At its output, the differential amplifier delivers a drift free analog video output. To produce the error signal, the output of the differential amplifier is digitized and supplied to a switching circuit. A reference signal is also supplied to the switching circuit. Alternatively, the switching circuit supplies the two signals it receives to a D/A and from there to first and second sample and hold circuits. A comparator compares the level of the two signals that are supplied by the switching circuit and produces the error signal from them. The video signal is sampled during its pedestal phase and the reference signal shortly thereafter. The difference amplifier adjusts its output to minimize the level of the error signal.

REFERENCES:
patent: 4124869 (1978-11-01), Heitmann
patent: 4473846 (1984-09-01), Mackereth
patent: 4562471 (1985-12-01), Eouzan et al.

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