Confidential communication system

Details Confidential communication system Confidential communication system

H - Electricity

04

K

325/3

H04K 1/00 (2006.01)

Patent

CA 1260542

ABSTRACT OF THE DISCLOSURE The respective feature parameters extracted from a speech signal is converted into the corresponding line spectrum data in a first frequency band obtained by dividing the speech signal frequency band. Each of the line spectrum data is allocated previously to each one of the feature parameters. The extracted feature pararmeters are further converted into the corresponding line spectrum data in the other divided frequency bands other than the first frequency band. The converted line spectrum data are multiplexed for transmission. The corresponding line spectrum data in the divided frequency bands allocated to the same feature parameter are logically added to restore the feature parameters. Thus higher confidential communication is realized.

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