Two-level picture signal transmission system

Details Two-level picture signal transmission system Two-level picture signal transmission system

1974-12-09

1976-08-03

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178 67, 178 68, 178DIG3, 325 30, 325 38A, H04L 2720

Patent

active

039730794

ABSTRACT:
In a transmission system in which two-level picture signal is divided into blocks, each having a predetermined number of picture elements, the pieces of signal contained in the respective blocks are converted to a predetermined number of codes, and the codes are converted to modulated signals having different levels or phase, the modulator circuit is so designed that any two modulated signals causing the shifting of the contour of picture may be converted to two signals having adjacent levels or phases, so as to minimize the degradation of the quality of the reproduced picture due to code errors caused during transmission.

REFERENCES:
patent: 3436474 (1969-04-01), Seeger
patent: 3747024 (1973-07-01), Choquet
patent: 3818135 (1974-06-01), Tannhauser

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