System and method for encrypting a voice signal

Details System and method for encrypting a voice signal System and method for encrypting a voice signal

1982-02-10

1984-04-17

Cangialosi, Sal

Telegraphy

Systems

Printing

179 15R, 179 15M, 179 15FS, H04K 106

Patent

active

044436602

ABSTRACT:
A system and method are disclosed for encrypting a voice signal. The input signal is filtered to provide a signal in a first path with components in a higher frequency band and a signal in a second path with components in a lower frequency band. Analog-to-digital conversion is carried out at a rate such that the frequency composition of the higher frequency path is inverted and shifted into the lower frequency band. Signals from the two paths are intermixed and converted to analog form at a rate greater than twice the rate of analog-to-digital conversion, so as to provide a randomized sequence of time segments of signals from the two paths, interspersed with gaps.

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