Video communication system and phase or frequency modulator incl

Details Video communication system and phase or frequency modulator incl Video communication system and phase or frequency modulator incl

1988-05-06

1990-07-31

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 85, 358469, 358134, H04N 704, H04N 714

Patent

active

049454048

ABSTRACT:
A video communication system for transmitting still pictures of a scene during periodic intervals comprises a T.V. camera producing video analog signals of the scene to be transmitted, an analog-to-digital converter converting the video analog signals to pixel digital signals representing the gray level of each pixel in the scene, a memory for storing the pixel gray levels, and a phase modulator for modulating a carrier wave by the pixel gray levels from the memory.

REFERENCES:
patent: 3898589 (1975-08-01), Tustison
patent: 4057836 (1977-11-01), Munsey
patent: 4059806 (1977-11-01), Vagt, Jr.
patent: 4400717 (1983-08-01), Southworth et al.
patent: 4739413 (1988-04-01), Meyer

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