Speech component key signaling system with code combinations

Details Speech component key signaling system with code combinations Speech component key signaling system with code combinations

1945-05-10

1976-04-27

Hubler, Malcolm F.

H04L 902

Patent

active

039536785

ABSTRACT:
1. In secret telephony, means to analyze input speech waves into low frequency speech-defining currents simultaneously existent in a plurality of separate circuit paths, means to add secret key currents to each speech-defining current to produce summation currents, means for periodically measuring the magnitude of each summation current, means to indicate the magnitudes of said currents by code combinations of pulses of equal number having fixed amplitudes, means to impress each pulse of the code combinations existing at any one time upon a different individual line, and means to continually alter the order of the lines upon which said pulses are impressed.

REFERENCES:
patent: 2262838 (1941-11-01), Deloraine et al.
patent: 2272070 (1942-02-01), Reeves

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