Abstract
The change in fundamental frequency (Fo) with the change in transglottal pressure (Ps) in phonation was studied at two different Fo levels within modal registers and at one Fo level in falsetto using ten human subjects. The method employed was a sudden increment of intraoral pressure during sustained phonation. The magnitudes of Fo change with respect to Ps change in falsetto were larger than those in high-pitched modal register in nine out of the ten subjects. The magnitudes of Fo change with respect to Ps change in high-pitched modal register were smaller than those in low-pitched modal register in six out of the ten subjects. Three subjects, however, showed the contrary results. One subject showed no difference. These rather unstable results obtained in high-pitched modal register against low-pitched modal register imply that the Fo change due to the transglottal pressure change during speech is not significant in linguistic realization.
