Video clamping circuit

Details Video clamping circuit Video clamping circuit

1983-04-12

1985-10-01

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358173, 307540, 307542, 307559, H04N 518, H04N 516

Patent

active

045449511

ABSTRACT:
A video clamping circuit adapted for satellite communication includes an operational amplifier for detecting the current flowing into a diode connected to the input terminal of the buffer amplifier of the circuit. The circuit further includes rectifying and smoothing elements for deriving a DC voltage from the output from the operational amplifier and adding the DC voltage to the signal of the output stage of the buffer amplifier in an anti-phase relation, so that an energy dispersal signal superimposed on a video signal is removed and waveform distortion is minimized.

REFERENCES:
patent: 3392236 (1968-08-01), Foster
patent: 3542944 (1970-11-01), Peffer
patent: 4261015 (1981-04-01), Dakroub
patent: 4296437 (1981-10-01), Feurts

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