Communication system

Details Communication system Communication system

1948-12-24

1978-11-14

Birmiel, Howard A.

Telegraphy

Systems

Printing

179 15M, 178 22, 325 32, 325 38B, H04K 102

Patent

active

041257448

ABSTRACT:
In a pulse code modulation system, a source of key signals comprising a source of random pulses, multisection delay device, means for applying said pulses to said multisection delay device, apparatus for combining the outputs of predetermined sections of said delay device and apparatus for enciphering pulse code modulation signals by combining said signals with said combined output from said sections of said multisection delay device.

REFERENCES:
patent: 2406024 (1946-08-01), McCann
patent: 3373245 (1968-03-01), Newby et al.
patent: 3944745 (1976-03-01), Gannett
patent: 3968454 (1976-07-01), Busch
patent: 3976839 (1976-08-01), Miller
patent: 3983327 (1976-09-01), Gannett

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