Voice band splitting scrambler

Details Voice band splitting scrambler Voice band splitting scrambler

1988-07-21

1991-11-12

Gregory, Bernarr E.

Cryptography

Communication system using cryptography

Frequency shift or inversion

380 9, 380 39, H04K 104

Patent

active

050654306

ABSTRACT:
Disclosed is a voice band splitting scrambler. To simplify the hardware thereof, the apparatus comprises a band splitting unit (11) for splitting an input voice signal into a plurality of band channels, and a scrambled voice signal generating unit (13) for carrying out spectrum-inverting and band-relocating operations on the respective channels to generate a scrambled voice signal. The scrambled voice signal generating unit (13) includes a modulating unit (15) for band-relocating the respective channels by noninverting carriers of inverting carriers set in different bands respectively; and an adding unit (17) for adding the signals of the noninverting channels and the signals of the inverted channels to each other.

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patent: 4747137 (1988-05-01), Matsunaga
patent: 4773092 (1988-09-01), Huange
patent: 4802219 (1989-01-01), Tjerlund

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