| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that speed conversion processing on a time axis is difficult in a high efficiency speech encoding method on the time axis. SOLUTION: An encoding unit 2 discriminates whether an input speech signal is voiced or unvoiced. Based on the results of discrimination, the encoding unit 2 performs sinusoidal synthesis and encoding for a signal portion found to be voiced, while performing vector quantization by closed-loop search for an optimum vector for a portion found to be unvoiced using an analysis-by-synthesis method, in order to find encoded parameters. A period modification unit 3 modifies an output period of the encoded parameters by expanding and compressing the time axis. A decoding unit 4 interpolates the encoded parameters which is output with the period modified by the period modification unit 3, and creates the modified encoded parameters corresponding to desired time. Based on the modified encoded parameters, a speech signal is synthesized and output from an output terminal 201. COPYRIGHT: (C)2008,JPO&INPIT
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