Digitally controlled video dissolve circuit

Details Digitally controlled video dissolve circuit Digitally controlled video dissolve circuit

1978-05-23

1980-09-16

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 10, H04N 522, H04N 702

Patent

active

042233518

ABSTRACT:
A video signal processing circuit for producing a dissolve control signal to control dissolving of a video signal uses primarily digital circuitry to derive the dissolve signal. A phase locked loop is used to produce a clock signal having a frequency which is a multiple of the vertical synchronizing signal in the video signal, and which is frequency divided by a fraction determined by a programmable counter which defines the rate of dissolve. The divided signal is processed by a signal processor and delivered to an up/down counter controlling a digital to analogue converter, the output of which is processed to produce as said control signal a ramp signal of which the slope is determined by the programmable counter.

REFERENCES:
patent: 3598908 (1971-08-01), Poulett
patent: 3941925 (1976-03-01), Busch et al.
patent: 4134129 (1979-01-01), Filipovich

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