Circuit for modifying the gradation of pictures produced by vide

Details Circuit for modifying the gradation of pictures produced by vide Circuit for modifying the gradation of pictures produced by vide

1981-04-15

1983-07-12

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358173, H04N 514

Patent

active

043934064

ABSTRACT:
A diode, of which the nonlinear characteristic is utilized for correcting the gradation characteristic of a video signal, has one of its electrodes connected to the output of the correction circuit, and has a voltage applied to its other electrode which is derived from the output voltage by inversion, amplification and integration during the blanking interval. Thus, in every blanking interval, the steady potential terminal of the diode is clamped to the desired black picture level for automatically holding constant the working region of the diode. An operational transconductance amplifier charges a capacitor, the voltage of which is applied to the diode through an impedance converter.

REFERENCES:
patent: 4143398 (1979-03-01), Harwood et al.

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