Pulse amplifier in a brightness control system

Details Pulse amplifier in a brightness control system Pulse amplifier in a brightness control system

1984-11-28

1986-07-08

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 39, 358 65, H04N 557, H04N 920

Patent

active

045996512

ABSTRACT:
A brightness control circuit in a video signal processing system includes an amplifier and an adjustable brightness control coupled to the amplifier input, which also receives keying pulses via a resistor-capacitor input circuit. Output pulses from the amplifier exhibit a brightness determinative amplitude related to the setting of the brightness control. To maintain a substantially constant waveshape for the output pulses as the brightness control is adjusted, a shaping capacitor is coupled between the input and output of the amplifier.

REFERENCES:
patent: 3678191 (1972-07-01), Peters et al.
patent: 4044375 (1977-08-01), Norman
patent: 4143398 (1979-03-01), Harwood et al.
patent: 4246501 (1981-01-01), Baker
patent: 4285008 (1981-08-01), Osawa et al.
patent: 4549214 (1985-10-01), Hinn

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