抄録
Sibilant /s/, one of unvoiced fricative sounds or consonants, is believed to be produced by turbulence of a jet created in a sibilant groove. In addition to turbulence, we hypothesize that the impingement of a jet to the anterior teeth induces vibration of anterior teeth, whereby contributing to the production of sibilant /s/. The present study is designed to investigate the possibility that the vibration of teeth contributes to the production of sibilant /s/. A morphologically simplified model of an oral cavity is fabricated. An air is steadily delivered at 45 L/min to the model to produce aeroacoustic sounds. Sound and vibration of teeth (obstacle wall) are measured simultaneously with a microphone and the Michelson interferometer. The spectrum analysis showed two peaks in the sound at 1275 and 3525 Hz, and one peak in the wall vibration at 3525 Hz. An association of the peak at 3525 Hz between the sound and wall vibration suggested that this sound is produced as a result of wall vibration. These results demonstrated potential of the proposed method for exploring the production mechanism of sibilant /s/ and possibility of the contribution of teeth vibration to the production of sibilant /s/.
