Telegraphy – Systems – Printing
Patent
1946-06-11
1982-12-21
Cangialosi, Sal
Telegraphy
Systems
Printing
178 2217, 179 15R, H04L 900
Patent
active
043651119
ABSTRACT:
23. In a secret communication system, the combination of: a source of an intelligence signal wave and a source of a noise wave; means for combining said waves; means for periodically sampling said combined wave at predetermined intervals; means for developing from the samples thus obtained a first pulse train comprising sets of marks and spaces; means for randomly developing in accordance with the noise components accompanying said intelligence signal wave a second pulse train of marks and spaces; means for combining said first and second pulse trains to develop a third pulse train; means for transmitting and receiving said third pulse train; means for developing from said third pulse train a fourth pulse train substantially corresponding with said first pulse train, said means including synchronizing means responsive substantially solely to the components of said third pulse train corresponding to said noise wave; and means for developing from said fourth pulse train an output signal wave substantially corresponding with said intelligence signal wave.
REFERENCES:
patent: 2183248 (1939-12-01), Riesz
patent: 2199634 (1940-05-01), Koch
patent: 2305625 (1942-12-01), Lauer
patent: 2338610 (1944-09-01), Weber, Jr.
patent: 2401855 (1946-06-01), Briggs et al.
patent: 2402059 (1946-06-01), Graib
patent: 2405252 (1946-08-01), Goldsmith
patent: 2405599 (1946-08-01), Mitchell
patent: 2405664 (1946-08-01), Mumma
patent: 2406977 (1946-09-01), Wendt
patent: 2410156 (1946-10-01), Flory
patent: 2411714 (1946-11-01), De Rosa
patent: 2422583 (1947-06-01), Mumma
patent: 2437707 (1948-03-01), Pierce
Bell Telephone Laboratories Incorporated
Cangialosi Sal
Kearns J. P.
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