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A method of tooth superimposition on MRI data for accurate measurement of vocal tract shape and dimensions
TLDR
In this article, a new method is proposed to accurately superimpose the teeth onto MRI volume data via a three-dimensional transformation using landmarks sampled from the tooth images and target MRI data.
Acoustic analysis of the vocal tract during vowel production by finite-difference time-domain method.
TLDR
By this method, transfer functions of the vocal tract for the five Japanese vowels were calculated from three-dimensionally reconstructed magnetic resonance imaging (MRI) data and compared with those obtained from acoustic measurements of vocal tract physical models precisely constructed from the same MRI data.
Difference in vocal tract shape between upright and supine postures: Observations by an open-type MRI scanner
Tatsuya Kitamura , Hironori Takemoto, Kiyoshi Honda, Yasuhiro Shimada, Ichiro Fujimoto, Yuko Syakudo, Shinobu Masaki, Kagayaki Kuroda, Noboru Oku-uchi and Michio Senda ATR Human Information Science
Acoustic roles of the laryngeal cavity in vocal tract resonance.
TLDR
The acoustic effects of the laryngeal cavity on the vocal tract resonance were investigated by using vocal tract area functions for the five Japanese vowels obtained from an adult male speaker to reveal one of the formants of the vocal tracts.
Individual variation of the hypopharyngeal cavities and its acoustic effects
TLDR
Morphological analysis on the mid-sagittal and transverse planes revealed that the shape of the hypopharynx was relatively stable, regardless of vowel type, in contrast to relatively large inter-speaker variation, and these results are confirmed quantitatively by a simple similarity method.
Visualisation of hypopharyngeal cavities and vocal-tract acoustic modelling
TLDR
An acoustic model of vowel production was proposed with three components: voice source, hypopharyngeal cavities and vocal tract proper, which provides effective means in controlling voice quality and expressing individual vocal characteristics.
Cyclicity of laryngeal cavity resonance due to vocal fold vibration.
TLDR
Investigation of acoustic effects of the time-varying glottal area due to vocal fold vibration on the laryngeal cavity resonance revealed that the resonance component could be observed as a pitch-synchronized rise-and-fall pattern of the bandpass amplitude.
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