Telegraphy – Systems – Printing
Patent
1961-12-08
1979-10-30
Farley, Richard A.
Telegraphy
Systems
Printing
178 22, 325 33, H04K 102
Patent
active
041729684
ABSTRACT:
1. In a secure communication system; means for producing an analog intelligence signal; means for limiting the amplitude of said signal; means for transforming portions of said amplitude limited signal occurring in time sequence into a corresponding digital signal consisting of sequentially occurring n-digit words; means for combining said digital signal with a digital keystream signal in modulo 2.sup.n fashion; and means for transforming the digital signal produced by said combining means into an analog signal.
REFERENCES:
patent: 1395378 (1921-11-01), Wilson et al.
patent: 1598673 (1926-09-01), Blackwell et al.
patent: 1632099 (1927-06-01), Schelleng
patent: 2405991 (1946-08-01), Beverage et al.
patent: 2993089 (1961-07-01), Negri
Hilliard Robert C.
Steinberg Bernard D.
Briody Thomas A.
Farley Richard A.
General Atronics Corporation
Iseman William J.
Streeter William J.
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