Telephone privacy system

Details Telephone privacy system Telephone privacy system

1944-06-30

1976-08-24

Birmiel, Howard A.

Telegraphy

Systems

Printing

178 22, 179 15R, 179 15A, 179 15BP, H04L 902

Patent

active

039768392

ABSTRACT:
1. In combination, means for receiving a signal wave accompanied by a pilot impulse, means to combine with the received signal wave a locally produced wave in predetermined phase relation comprising means to produce a local pilot impulse in definite relation to said locally produced wave, signal storage means, means responsive to said first pilot impulse to enable said storage means to receive and store said signal wave, a signal responsive device, and means controlled by said local impulse to impress said stored signal wave upon said signal responsive device together with said locally produced wave.
8. In a speech transmission system, means to sample input speech waves twice per cycle of the highest component frequency of the speech to be sent, means to produce pulses representative of the sampled speech equal in length to the time between sampling instants, means to combine said pulses with individual key pulses to disguise the speech pulses and means to transmit the combined pulses.

REFERENCES:
patent: 2366583 (1945-01-01), Williams
patent: 2429608 (1947-10-01), Chatterjea et al.

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