Signal level control circuit having alternately switched capacit

Details Signal level control circuit having alternately switched capacit Signal level control circuit having alternately switched capacit

1990-07-24

1991-05-07

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 34, 358171, 358174, H04N 518

Patent

active

050141309

ABSTRACT:
A circuit for controlling the amplitude of video signals includes a control circuit which contains a first capacitor. For each image pulse, a charge which corresponds to the amplitude of the generated video signal during a prior frame cycle is stored in the first capacitor. During the frame flyback pulse, this charge is transferred to a second capacitor by means of a switch. The second capacitor's voltage serves as a control voltage for the video signal. After the charge is transferred to the second capacitor, the first capacitor is discharged.

REFERENCES:
patent: 4296437 (1981-10-01), Geurts
patent: 4516042 (1985-05-01), Nakamura
patent: 4549214 (1985-10-01), Hinn
patent: 4797744 (1989-01-01), Klemmer et al.
patent: 4811087 (1989-03-01), Engel et al.
patent: 4811101 (1989-03-01), Yagi
patent: 4884141 (1989-11-01), Hyakutake
patent: 4963969 (1990-10-01), Kitaura et al.

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