7th International Conference on Spoken Language Processing

September 16-20, 2002
Denver, Colorado, USA

Frequency Dependence of Vocal-Tract Length

Takuya Niikawa, Takanori Ando, Masafumi Matsumura

Osaka Electro-Communication University, Japan

The purpose of this study was to estimate the vocal-tract length based on the distribution of sound pressure in the three-dimensional (3-D) vocal tract during the pronunciation of Japanese vowels. The 3-D shapes of a vocal tract and a dental crown were measured using Magnetic Resonance Imaging (MRI). A male subject was asked to produce Japanese vowels while wearing a dental crown plate that contained a contrast medium for MRI processing. The distribution of sound pressure was estimated in the 3-D vocal tract using the Finite Element Method (FEM). The distribution of sound pressure shows that a sound wave propagates in the vocal tract as a non-plane wave in the high frequency region. The vocal-tract length was estimated based on the distribution of sound pressure in the 3-D vocal tract. The result suggests that the vocal-tract length is long in the high frequency region.


Full Paper

Bibliographic reference.  Niikawa, Takuya / Ando, Takanori / Matsumura, Masafumi (2002): "Frequency dependence of vocal-tract length", In ICSLP-2002, 1525-1528.