Facsimile system

Details Facsimile system Facsimile system

1973-10-26

1976-03-30

Britton, Howard W.

Telegraphy

Systems

Simplex-reversing periodic

178 76, 178DIG3, H04N 112

Patent

active

039476278

ABSTRACT:
A two-valued image is scanned repeatedly along a single line path at a predetermined constant rate and gated out when a transmitter is ready for transmission. A plurality of memory devices are used cyclically for storing an image signal of successive lines. The signal is gated out for processing and then transmitted. In one aspect of the invention, two-valued image is scanned on a two-line-at-a-time basis to produce first and second discrete sampled signals which are combined one-by-one to form four combinations of discrete signals. The combinations are formed into a sequence of combination runs. The kinds of combinations and the length of combination runs are respectively encoded into binary codes for transmission.

REFERENCES:
patent: 3383461 (1968-05-01), Dryden
patent: 3632867 (1972-01-01), Markow
patent: 3814846 (1974-06-01), Snow

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