Circuitry for expanding the effect of a video control signal in

Details Circuitry for expanding the effect of a video control signal in Circuitry for expanding the effect of a video control signal in

1988-03-07

1989-09-19

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 31, H04N 712, H04N 978

Patent

active

048686506

ABSTRACT:
A control signal spreader for ameliorating undesirable effects of abrupt changes in a control signal in a video signal processor gradually changes the magnitude of the control signal in the horizontal, vertical and temporal dimensions of the video signal. The control signal is applied to a first circuit, which, responsive to positive transitions of the control signal, generates a gradually increasing signal and provides the lesser valued one of the control signal and the generated signal. A delayed version of the control signal is applied to a second circuit, which, responsive to negative transitions of the control signal, generates a gradually decaying signal and provides the greater valued one of the control signal and the generated decaying signal. The first and second circuits are coupled to a third circuit which provides as an output control signal, the greater valued signal provided by the first and second circuits.

REFERENCES:
patent: 4064530 (1977-12-01), Kaiser et al.
patent: 4141035 (1979-02-01), Maxemchuck et al.
patent: 4163249 (1979-07-01), Michael et al.
patent: 4539594 (1985-09-01), Illetschko
patent: 4639784 (1987-01-01), Fling
patent: 4679086 (1987-07-01), May
patent: 4730217 (1988-03-01), Torge et al.
patent: 4733297 (1988-03-01), Katsumata et al.
patent: 4760446 (1988-07-01), Ninomiya et al.
J. O. Drewery et al., "Video Noise Reduction", BBC Research Dept. Report BBC RD 1984/7, Jul. 1984, pp. 1-49.
Exhibit A-Confidential Schematic Diagram received from Hitachi Corp.

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