| 摘要 |
PURPOSE: To obtain a converted pitch voice having better sound quality in a PSOLA method. CONSTITUTION: This device is provided with a linear prediction analyzing means 11 obtaining a linear prediction residual signal of a voice signal converted to a digital signal, a phase equalization processing means 12 equalizing a short time phase characteristic of the linear prediction residual signal with a matched filter, obtaining accurately a pitch position (exciting point of the vocal bands) from a phase equalizing signal in which power is concentrated near a pitch pulse, and making the pulse position a pitch position, a pitch period deciding means 13 obtaining a pitch period from a difference between adjacent pitch positions, a pitch waveform cutting out means 14 cutting out a waveform of one pitch using a window function having a window length two times as much as a obtained pitch period when it is Hanning window or a window function having a window length three times as much when it is Blackman harris window so as to set the center of the pitch position, and a pitch waveform overlapping means 15 rearranging a pitch waveform cut out by the pitch waveform cutting out means to the desired pitch period and rearranging them. |
