Secret-signalling system utilizing noise communication

Details Secret-signalling system utilizing noise communication Secret-signalling system utilizing noise communication

1968-08-23

1979-12-18

Birmiel, Howard A.

325 32, 325 49, 325 65, 325138, H04K 100

Patent

active

041796586

ABSTRACT:
A secret-signaling, transmitted-reference, spread-spectrum system, utiliz a suppressed-noise carrier for the information signal in combination with a delayed-noise, suppressed carrier of a fixed frequency in order to spectrum-spread the voice signal across the noise signal in the same frequency band. The receiver of the system delays the transmitted signal input which is taken together with the undelayed transmitted signal to determine correlation in order to extract, from the transmitted spread-spectrum signal, solely the information signal generated.

REFERENCES:
patent: 3391339 (1968-07-01), Lynch

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