Interpolator for facsimile bandwidth compression

Details Interpolator for facsimile bandwidth compression Interpolator for facsimile bandwidth compression

1974-10-21

1976-08-10

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178 68, 178DIG3, H04M 138

Patent

active

039743250

ABSTRACT:
In a facsimile transmission device, means for reducing the bandwidth which includes a clock rate halving flip-flop and an odd-even line switching flip-flop which are logically combined to transmit every second data bit in each line in a vertical stagger between lines. At the receiving end the missing bits are filled in by an interpolation device according to the data in the vertically adjacent bits or the horizontally adjacent bits.

REFERENCES:
patent: 2810780 (1957-10-01), Loughlin
patent: 3051778 (1962-04-01), Graham
patent: 3372228 (1968-03-01), Law
patent: 3463876 (1969-08-01), Law
patent: 3541244 (1970-11-01), Law
patent: 3632867 (1972-01-01), Markow
patent: 3715483 (1973-02-01), Limb
patent: 3848083 (1974-11-01), Townsend

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