Telegraphy – Systems – Simplex-reversing periodic
Patent
1974-07-05
1976-11-23
Martin, John C.
Telegraphy
Systems
Simplex-reversing periodic
178DIG3, 178 66A, 325 30, H04N 538, G01N 2742, H04L 2700
Patent
active
039938620
ABSTRACT:
A facsimile system is explained on the basis of a single unit which is connected to a video pick-up device and to a facsimile reconstruction device. The video signal is converted into a two level signal and the lengths of runs of the same level are metered by counting increments of such run lengths and converted the count numbers into a stream of ternary digits to distinguish length numbers for the runs of different signal levels by digit notation. These ternary encoded run length numbers pass through a buffer for storage on tape. Upon retrieval they pass again through the buffer and are converted in groups of one or two ternary digits into seven symbols, used to phase and amplitude modulate a carrier for transmission. Carrier signals when received are demodulated and converted into ternary code signals, which are buffered and stored. Upon image reconstruction, the stored, ternary encoded run length numbers are retrieved, pass through the buffer and are used to re-establish a two level signal. The system and method as such is usable for data compression of any type of two level source signals.
REFERENCES:
patent: 2963551 (1960-12-01), Schreiber
patent: 3414677 (1968-12-01), Quinlan
patent: 3585504 (1971-06-01), Mumford et al.
patent: 3723641 (1973-03-01), Heinrich et al.
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