Secret telephony

Details Secret telephony Secret telephony

1941-12-18

1976-10-12

Birmiel, H. A.

179 15M, H04K 104

Patent

active

039859584

ABSTRACT:
1. In secret telephony, means to analyze speech message waves into slowly varying currents representative of energy variations in respective portions of the speech frequency band, distributor means for rapidly switching fragments of said currents to line in rotation, a source of masing currents for each of said slowly varying currents, the masking currents each varying in magnitude in random manner, and synchronously operating means for adding masking current from a respective source to each fragment of the switched currents.

REFERENCES:
patent: 2098956 (1937-11-01), Dudley
patent: 2107756 (1938-02-01), Kendall et al.
patent: 2395431 (1946-02-01), Sprague
patent: 2405599 (1946-08-01), Mitchell

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