Secure digital conferencing system

Details Secure digital conferencing system Secure digital conferencing system

1991-04-11

1992-09-22

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

370 62, 375 3, 379202, H04K 100, H04Q 1104, H04B 336, H04M 342

Patent

active

051504103

ABSTRACT:
A secure narrowband digital conferencing system is capable of handing multiple speakers simultaneously and in a full duplex mode. The system uses a multipulse or a code-excited linear predictive (CELP) speech processing algorithm for colding the speech signals of the respective participants. A conference director receives the multipluse or CELP encrypted voice signal streams over normal telephone links, decrypts them, then synthesizes a composite speech signal and uses an analysis-by-synthesis algorithm to compress them, and then encrypts the composite signal and transmits it back to all the participants.

REFERENCES:
patent: 4215247 (1980-07-01), Lambert
patent: 4899385 (1990-02-01), Ketchum et al.
patent: 5020098 (1991-05-01), Celli

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