Scrambler and unscrambler for serial data

Details Scrambler and unscrambler for serial data Scrambler and unscrambler for serial data

1976-08-04

1978-05-02

Birmiel, Howard A.

Telegraphy

Systems

Printing

364900, H04L 900, H04K 106

Patent

active

040876268

ABSTRACT:
Serial data is scrambled at a transmitting terminal by storing it in sequential locations in a first random access memory, while previously stored information is read out of a second random access memory using a pseudo-random address counter. Whenever one memory is filled and the other memory is emptied, the roles of the memories are transposed. Similar apparatus at a receiving terminal is operated in synchronism and phase to unscramble the received data.

REFERENCES:
patent: 3631406 (1971-12-01), Kurner
patent: 3657699 (1972-04-01), Rocher
patent: 3731197 (1973-05-01), Clark
patent: 3773977 (1973-11-01), Guanella
patent: 3824467 (1974-07-01), French
patent: 3921151 (1975-11-01), Guanella
patent: 3970790 (1976-07-01), Guanella

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