Code communication

Details Code communication Code communication

1973-03-26

1976-02-10

Libman, George H.

Telegraphy

Systems

Simplex-reversing periodic

178DIG3, 325 38B, H04N 712, H03K 1322

Patent

active

039378713

ABSTRACT:
A method and apparatus for code communication is disclosed in order to achieve band-width compression. Successive portions of information are derived and the next portion of information is predicted from at least one preceding portion, an error signal is then generated corresponding to the difference between the predicted portion and the next actual portion of information, whereafter the error signal is coded for transmission to a receiving device. The system is particularly described for coding two level signals derived from a facsimile transmitter, e.g., by the scanning of text or pictures.

REFERENCES:
patent: 3071727 (1963-01-01), Kitsopoulos
patent: 3394352 (1968-07-01), Wernikoff et al.
patent: 3560639 (1971-02-01), Centanni
patent: 3769453 (1973-10-01), Bahl et al.
"Adaptive Data Compression Scheme," H. Kobayashi, IBM Technical Disclosure Bulletin, Vol. 14, No. 4, Sept. 1971, pp. 1305-1311.

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