| 摘要 |
PROBLEM TO BE SOLVED: To set a pitch mark of a voice automatically and at an accurate position. SOLUTION: A primary voice is inputted (step S101), its pitch period is extracted (step 102), and a fundamental wave component is extracted by passing a voice waveform through a low pass filter of which a cut-off frequency is a value of the prescribed constant multiple of a reciprocal of a detected pitch period, and the fundamental wave component is extracted (step S103). Next, a time value corresponding to the maximum value of this fundamental wave component is calculated (step S104), group delay correction is performed for the time value and a pitch mark candidate point is calculated (step 105). And the maximum value of a voice waveform near this pitch mark candidate point is calculated (step S106), the time value corresponding to this value is decided as the pitch mark (step 107). |
