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(42) Computation of the acoustic characteristics of simplified vocal-tract models by 3-D finite element method
¡¡¡¡¡¡Proceedings of International Symposium on Communications and Information Technologies 2004 (ISCIT2004)
,pp.894-899, 2004-10
The acoustic characteristics of vocal-tract models are
investigated using a three-dimensional finite element method. Several
finite element models are created in order to examine the influence of
the simplification of the vocal-tract shapes on the finer acoustic
characteristics up to the higher frequencies of around 8 kHz. The
simplification takes into account the following aspects:
cross-sectional shape, bend, branches of the pyriform fossa and the
valleculla, and lip protrusion. The effects of the yielding
vocal-tract wall are also studied. The results indicate that with the
frequency range up to around the third formant, the simplification of
the cross section and the bend is considered to be an effective
approximation. It is shown that the use of soft walls suppresses the
appearance of sharp peaks and zeros in the frequencies above 3 kHz It
is suggested that the lips and the branches independently affect the
shifts of the first three formant frequencies.
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