Scanning velocity modulation system

Details Scanning velocity modulation system Scanning velocity modulation system

1978-05-30

1980-01-22

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 568

Patent

active

041853016

ABSTRACT:
A system for compensating image contour by modulating a scanning velocity in accordance with a video signal is disclosed, in which a mean current dissipated in a driving power amplifier is detected to control a gain of an amplifier in a preceding stage for suppressing the increase of power dissipation in the power amplifier when a video signal having many noises is received. The preceding stage amplifier is provided with a saturation characteristic to enhance the effect of contour compensation at a small amplitude signal and eliminate over compensation of image contour at a large amplitude signal. The combination of the saturation characteristic and the gain control further enhances the effect of suppression of power dissipation.

REFERENCES:
patent: 2678964 (1954-05-01), Loughlin
patent: 2798114 (1957-07-01), Schlesinger
patent: 3830958 (1974-08-01), Fuse et al.
patent: 3936872 (1976-02-01), Miyaska
patent: 3980819 (1976-09-01), Schwartz
patent: 4080628 (1978-03-01), Jirka

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