| 摘要 |
PROBLEM TO BE SOLVED: To determine a pitch that a person can appropriately phonate.SOLUTION: In stable region determination processing, a control unit extracts a vowel phonation waveform, which is a waveform of a pronounced vowel at each of musical tones constituting a singing melody, and associates it with the contents of the pronounced vowel at the vowel phonation waveform (S220). The control unit derives, as voice quality evaluation, a correlation coefficient between an average vector (i.e., an example of phonation cepstrum) for the contents of each vowel and vowel standard cepstrum prepared in advance for each of the contents of the vowels (S260). The control unit identifies a stable phonation region, which is a sound region where a user can stably phonate (S280). In the identification of the stable phonation region, the control unit identifies, as a vowel stable phonation range, a sound range from the lowest pitch to the highest pitch among pitches corresponding to the voice quality evaluation at or above a specified threshold value specified in advance. |
