1950-01-04
1981-05-05
Birmiel, Howard A.
H04K 100
Patent
active
042660955
ABSTRACT:
1. In a secret communication system including a source of an intelligence signal wave, means for periodically sampling said signal wave at predetermined intervals, and means for developing from the samples thus obtained a first pulse train comprising groups each having n binary digits: means for developing a second pulse train comprising groups of n binary digits, (n-1) of said binary digits corresponding respectively with a selected binary digit in each of the preceding (n-1) groups of said first pulse train; means for combining said first and second pulse trains to develop a third pulse train; and means for utilizing said third pulse train.
REFERENCES:
patent: 2438908 (1948-04-01), Goodall
patent: 2486391 (1949-11-01), Cunningham
patent: 2516146 (1950-07-01), Prugh
patent: 2531846 (1950-11-01), Goodall
patent: 3944745 (1976-03-01), Gannett
patent: 4178474 (1979-12-01), Joel, Jr.
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