Run length encoding and decoding methods and means

Details Run length encoding and decoding methods and means Run length encoding and decoding methods and means

1976-09-27

1977-11-01

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358261, 358262, 358260, 325 38A, 178 68, H04N 712

Patent

active

040568288

ABSTRACT:
Black and white run length encoding means first convert a binary video input signal having a raster scan format into binary black and white run length message codes which are preselected so that the initial or lead bit of each of those codes is at a given logic level. Ternary encoding means then convert the binary message codes into a series of ternary black and white run length message codes which have distinctive amplitude transitions at any intra-scan line code boundaries. To recover the video signal, the process is reversed. Moreover, a passband signal for transmitting the ternary codes from a transmitting terminal to a receiving terminal via a limited bandwidth communications channel may be provided by amplitude modulating a carrier frequency signal in accordance with the ternary codes.

REFERENCES:
patent: 3233236 (1966-02-01), Katzenstein
patent: 3337864 (1967-08-01), Lender
patent: 3502806 (1970-03-01), Townsend
patent: 3847732 (1974-11-01), Perreault

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