Secret telephony

Details Secret telephony Secret telephony

1941-09-24

1976-06-29

Birmiel, Howard A.

179 1SA, H04K 102

Patent

active

039670678

ABSTRACT:
1. In a system of secret transmission of speech, means to subdivide speech waves constituting a message into a plurality of narrow frequency bands, means to integrate the energy in each band, means individual to said bands to subdivide the integrated energy from each band on a time basis to produce impulses with intervening spaces, and means to variably control said last-mentioned subdividing means individually in accordance with a key unrelated to the message.

REFERENCES:
patent: 1310719 (1919-07-01), Vernam
patent: 1829783 (1931-11-01), Chestnut et al.
patent: 2213320 (1940-09-01), Mathes et al.
patent: 2243527 (1941-05-01), Dudley

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