Composite video waveform generator

Details Composite video waveform generator Composite video waveform generator

1978-01-16

1979-06-26

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358160, H04N 538

Patent

active

041594860

ABSTRACT:
The generation of a composite video waveform from three signals representing video data, blanking, and synchronization information is accomplished by supplying the video data, blanking and synchronization signals to the cathode side of three different diode circuits. The three different diode circuits are tied to a common voltage source on the anode side of the diode circuits. The forward voltage drop across the diode circuits determines the signal level seen by a video monitor in response to the video data, blanking and synchronization signals. In a preferred embodiment, at least one Schottky diode is utilized in each diode circuit to provide sharp edge definition for the composite video waveform. In a less preferred embodiment, conventional silicon switching diodes are used to replace the Schottky diodes but a sacrifice in edge definition for the composite video waveform results.

REFERENCES:
patent: 3487162 (1969-12-01), Gordon et al.
patent: 3699258 (1972-10-01), Torek

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