Secure communication system with improved frequency-hopping arra

Details Secure communication system with improved frequency-hopping arra Secure communication system with improved frequency-hopping arra

1978-10-02

1981-06-30

Birmiel, Howard A.

Telecommunications

Carrier wave repeater or relay system

Frequency or phase modulation

375 21, 179 15R, 179 15FS, H04K 104

Patent

active

042766524

ABSTRACT:
A signal scrambling system of the type in which the frequencies of the information signal band are inverted by heterodyning the information signal with a varying beat frequency. In accordance with the invention the beat frequency varies in a sequence of small increments which, in their totality, provide large overall frequency excursions and which, individually, are sufficiently small to avoid the generation of unduly strong spurious signals within the information signal band.

REFERENCES:
patent: 3155908 (1964-11-01), Berman
patent: 3584303 (1971-06-01), Guanella
patent: 3706928 (1972-12-01), Beck
patent: 3824468 (1974-07-01), Zegers et al.
patent: 3838342 (1974-09-01), Bjorkman
patent: 4023103 (1977-05-01), Malm
patent: 4037159 (1977-07-01), Martin
patent: 4058677 (1977-11-01), Maitland et al.
patent: 4066964 (1978-01-01), Costanza et al.

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