| 摘要 |
PROBLEM TO BE SOLVED: To provide a secret speech transmitter and a secret speech receiver, capable of sufficiently realizing a secret speech function by a small capacity CPU. SOLUTION: When the communication is performed according to a speech coding method of the type in which a plurality of indexes compressed by the coding are transmitted, in which various kinds of parameters are reconstructed by the respective indexes, and in which the speech is decoded, the correct speech is decoded by transforming the indexes to be transmitted from the normal indexes into the other indexes and by reconstructing the transformed indexes into the normal indexes. The receiving person incapable of reconstructing the indexes into the correct indexes is prevented from the normal decoding, and cannot hear the speech. COPYRIGHT: (C)2005,JPO&NCIPI
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