Time division multiplied speech scrambler

Details Time division multiplied speech scrambler Time division multiplied speech scrambler

1977-10-17

1980-09-09

Birmiel, Howard A.

Telegraphy

Systems

Printing

178 22, 179 15S, H04K 104, H04K 106

Patent

active

042219310

ABSTRACT:
A privacy communication system in which increased security is provided in the scrambling of speech signals. Input speech is separated into a high frequency band and a low frequency band, and each band is time scrambled independently and recombined prior to transmission. Additional security is obtained with randomly selected segments of the scrambled speech being reversed in time. Further randomizing of the pseudorandom sequence which controls the scrambling operation is also provided, as well as simplified computing of delay times for the descrambling operation.

REFERENCES:
patent: 2405500 (1946-08-01), Guanella
patent: 3201517 (1965-08-01), Gannett
patent: 3717206 (1973-02-01), Zopf et al.
patent: 3824467 (1974-07-01), French
patent: 3921151 (1975-11-01), Guanella
patent: 4087626 (1978-05-01), Brader
patent: 4149035 (1979-04-01), Fuitiger

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