Privacy communication system employing time/frequency transforma

Details Privacy communication system employing time/frequency transforma Privacy communication system employing time/frequency transforma

1981-11-04

1984-02-21

Cangialosi, Sal

Telegraphy

Systems

Printing

179 15R, 178 2204, H04K 106, H04L 900

Patent

active

044332114

ABSTRACT:
A privacy communication system digitizes a voice signal and divides the signal into different frequency bands or time segments and shifts the bands or segments in frequency and/or time under control of a continually changing pseudo-random key word to develop an encrypted transmitted signal having the same time/bandwidth product as the voice signal.

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patent: 4058677 (1977-11-01), Maitland et al.
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patent: 4071707 (1978-01-01), Graf et al.
patent: 4179035 (1979-04-01), Frutiger
patent: 4217469 (1980-08-01), Martelli
patent: 4221931 (1980-09-01), Seiler

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