1967-08-25
1976-11-30
Birmiel, Howard A.
179 15R, H04K 104
Patent
active
039951154
ABSTRACT:
The communication of confidential information is generally accomplished by transforming applied message waves into an unintelligible form prior to transmission. Such a transformation may be accomplished by scrambling the applied message waves in either the frequency or time domain. Scrambling, per se, does not render a signal satisfactorily unintelligible. In order to overcome this deficiency, scrambling techniques are utilized jointly with vocoder and selective speech processing methods. In a voice-excited vocoder, the spectrum channel control signals are scrambled in the frequency domain and the baseband signal is severely center clipped in order to enhance unintelligibility. A high degree of privacy during transmission is thus obtained with negligible effect upon the quality or intelligibility of speech synthesized by an authorized recipient.
REFERENCES:
patent: 3341659 (1967-09-01), Stern
Bell Telephone Laboratories Incorporated
Birmiel Howard A.
Murphy G. E.
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