Abstract
Vocal fundamental frequency (fo) drop in relation to changes in intraoral pressure (Po) was investigated for adult male and female speakers of Japanese producing /b/ and /v/ in VCV contexts. Three experiments were conducted to examine the following effects on fo drop: (1) vocal tract constriction, (2) vowel context, and (3) speech rate. The results showed that the fo drop from vowels to a consonant was greater for /aba/ than for /ava/; it was greater for high vowel contexts, /ibi/, /abi/, /iba/, than for a low vowel context, /aba/. Speech rate changes with metronome and self-paced had variable effects on the fo drop. Overall, the fo drop for /aba/ ranged from 4% to 13% or from 0.75 to 2.17 semitones. Comparisions with English speakers will be reported. Effects of gender, vocal pitch, and intensity levels, and accent may be discussed.
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