Secure digital conferencing system
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United States of America Patent
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Sep 22, 1992
Grant Date -
N/A
app pub date -
Apr 11, 1991
filing date -
Apr 11, 1991
priority date (Note) -
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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.
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