著者

Yasufumi Uezu Tokihiko Kaburagi

出版者

ACOUSTICAL SOCIETY OF JAPAN

雑誌

Acoustical Science and Technology (ISSN:13463969)

巻号頁・発行日

vol.37, no.6, pp.267-276, 2016-11-01 (Released:2016-11-01)

参考文献数

17

被引用文献数

1 4

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When one of the dominant harmonics (the fundamental frequency and its harmonic components) is close to the first formant frequency, the effect of the source-filter interaction can induce voice register transition, in which the vocal-fold vibration becomes unstable and the pitch jumps abruptly. We investigated the relationship between the dominant harmonics, the first formant frequency, and the pitch jump width in the modal-falsetto transition to examine the effect of source-filter interaction. We measured temporal patterns of the fundamental frequency and the first formant when subjects performed rising glissandi with /a/ and /i/ vowels. For the /a/ vowel, there were weak proximity relationships between the dominant harmonics and first formant during the transition, indicating that source-induced transition occurred. For the /i/ vowel, in contrast, the fundamental frequency was regularly close to the first formant in the transition, indicating that the acoustically induced transition was caused by the source-filter interaction. Additionally, it was found that the difference between these two mechanisms had little influence on the pitch jump width. Finally, we concluded that the source-filter interaction is a contributory factor of the modal-falsetto transition, in agreement with foregoing studies.