Secure voice transmission

Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing

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381 51, 178 2213, H04M 170

Patent

active

046124144

ABSTRACT:
Voice signals are transmitted over a voiceband telephone channel with a high degree of security and good voice quality by applying to the transmission channel a first signal which includes digital information derived from the vocal tract response of the signal and a second signal which includes continuous information derived from the excitation component of the voice signal.

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"A Comparison of Four Methods for Analog Speech Privacy," IEEE Transactions on Communications, N. S. Jayant et al., 1981, pp. 18-23.
"Distortion Performance of Vector Quantization for LPC Voice Coding," IEEE Transactions on Acoustics, Speech & Signal Proc., B. Juang et al., 1982, pp. 294-304.

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