Communication method and system

Details Communication method and system Communication method and system

1979-08-13

1981-10-13

Nusbaum, Mark E.

Communications: electrical

Audible indication

Percussion-type sound producer

364900, H03K 1300, H04L 300

Patent

active

042951240

ABSTRACT:
This communication system reduces required data transmission channel capacity by encoding source words into encoded words with usually less binary bits for transmission. Features of the invention include a hashing algorithm which transforms the source words into psuedorandom code words used for both transmission and addresses in a vocabulary memory. Before transmission each source word and its hash code is checked against a pre-recorded vocabulary memory to decide which should be transmitted.

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patent: 4140873 (1979-02-01), Kinch
M. Healey, "Checking the Execution of Programs by Hashing", IBM Tech. Discl. Bull., Dec. 1972, p. 2175.
B. Bloom, "Space/Time Tradeoffs in Hash Coding", _Comm. of ACM, Jul. 1970, pp. 422-426.

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