1944-06-30
1976-09-07
Birmiel, H.A.
179 155, H04K 104
Patent
active
039795586
ABSTRACT:
1. In a speech privacy transmission system, means for analyzing speech currents into component frequency band currents in a plurality of separate circuits, a corresponding plurality of separate transmission channels, a common keying circuit having an input side and an output side for keying each of said frequency band currents in succession, distributor means for connecting the input side of said keying circuit to each of said plurality of separate circuits in rotation to enable the frequency band currents therein to be keyed in succession, and distributor means for connecting the output side of said keying circuit to each of said plurality of transmission circuits in rotation to enable the keyed currents to be individually transmitted over said respective channels.
REFERENCES:
patent: 1752485 (1930-04-01), Hartley
patent: 2132205 (1938-10-01), Dickieson
patent: 2151091 (1939-03-01), Dudley
patent: 2411683 (1946-11-01), Guanella
Bell Telephone Laboratories Incorporated
Birmiel H.A.
Burgess H. A.
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