Dynamic frequency and time voice encryption system and method

Details Dynamic frequency and time voice encryption system and method Dynamic frequency and time voice encryption system and method

1979-03-23

1981-07-14

Birmiel, Howard A.

179 15R, H04K 104

Patent

active

042788404

ABSTRACT:
A voice scrambler system (10) for encryption of a voice signal is provided. The voice scrambler system (10) includes a first generator (124) for generating a fixed frequency signal. A second generator (132) is provided for generating a plurality of frequency signals. Control circuitry (134) is provided for dynamically controlling the second generator (132) for randomly generating the plurality of variable frequency signals. A mixer (122) heterodynes the voice signal with the fixed frequency signal generated by the first generator (124). A filter (126) filters the output of the first mixer (122). An adder (128) adds the voice signal and the output of the first filter (126). A second mixer (130) heterodynes the output of the adder (128) with one of the plurality of frequency signals generated by the second generator (132). A second filter (136) filters the output of the second mixer (130) to generate an encrypted voice signal.

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"Final Report on Project C-66, Frequency-Time Division Speech Privacy System", Prepared for Division 13, Section 3 of the National Defense Research Committee of the Office of Scientific R & D by Bell Telephone Laboratories, Inc., dated May 29, 1943 (Contract No. OEMsr-795).

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