System for reducing the transmission time of similar portions of

Details System for reducing the transmission time of similar portions of System for reducing the transmission time of similar portions of

1975-02-03

1976-05-11

Libman, George H.

Telegraphy

Systems

Simplex-reversing periodic

178DIG3, 179 15BW, H04L 300

Patent

active

039565807

ABSTRACT:
In a transmitter, a fixed visible image or the subject copy is scanned with a predetermined scanning line width to convert the divided image pattern of each scanning line into a binary coded bit pattern; an old bit pattern of a scanning line is compared with a new bit pattern of the next scanning line to determine the similarity or coincidence therebetween; and when their similarity is higher than a predetermined degree, instead of the new bit pattern, the address signals representing the positions of the associated pairs of different bits in said old and new bit patterns are transmitted. In a receiver, the bits of said old bit pattern in the positions designated by said address signals are changed in polarity or the like, thereby reproducing said new bit pattern.

REFERENCES:
patent: 3347981 (1967-10-01), Kagan et al.
patent: 3571505 (1971-03-01), Mounts
patent: 3686631 (1972-08-01), Elliott

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