| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for realizing the operation of a Formant position with a lighter load. SOLUTION: The speech data inputted from an A/D converter 8 is extracted in a frame unit, is subjected to fast Fourie transform and is decomposed to a frequency amplitude component and a phase component. The ratio of the frequency components before and after filtering by a moving average filter section 304 is calculated as a frequency amplitude residual and the residual is multiplied by the frequency amplitude scheme obtained by filtering of the frequency amplitude component after a shift, by which the frequency amplitude component is calculated. The pitch is moved by shifting the instantaneous frequency calculated from the phase component. Reverse fast Fourie transform is performed by using the phase component obtained from the frequency amplitude component calculated in such a manner and the instantaneous frequency after the shift, by which the speech data obtained by operating the Formant position and further the pitch is generated. COPYRIGHT: (C)2005,JPO&NCIPI
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