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Examining the Acoustic Contributions of the Epilaryngeal Tube to the Voice Source and Vocal Tract Resonance

Canadian Acoustical Association / Association canadienne d'acoustique
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  • Speech Communication
  • Biology
  • Medicine
  • Musicology
  • Physics


E x a m in in g t h e A c o u s t ic C o n t r ib u t io n s o f t h e E p il a r y n g e a l T u b e to t h e V o ic e S o u r c e a n d V o c a l T r a c t R e s o n a n c e Scott R. Moisik1 and John H. Esling1 'Dept. of Linguistics, University of Victoria, BC, Canada, 1. i n t r o d u c t i o n In this study, we provide observations from videofluoroscopic and high-speed laryngoscopic techniques, combined with spectral analysis, to increase our understanding of the acoustic nature of aryepiglottic trilling and the epilaryngeal tube in general. The underlying goal is to work towards a complete biomechanical model of the laryngeal framework that acknowledges the role of the supraglottal structure of the larynx in shaping the nature of the voice source and of vocal tract resonance. The epilaryngeal tube (sometimes referred to as the laryngeal vestibule; see Fig. 1) constitutes an important component of the larynx that can modulate the voice source in several ways and partly determines the resonances of the lower vocal tract. Under static configurations, Titze (2008) demonstrates how epilaryngeal tube constriction changes the acoustic coupling between the sub- and supralaryngeal vocal tract sections, giving rise to changes in vocal fold dynamics of a non-linear nature (where the filter is influencing the source). With sufficient airflow, various parts of the epilaryngeal tube can also be set into oscillation. This means that the acoustic coupling effect of the epilarygeal tube can vary as a function of time. Fig. 1. Epilaryngeal tube anatomy. Mid-sagittal (a); Posterior (b). There are three main components of the epilaryngeal tube that self-oscillate: the ventricular folds, the aryepiglottic folds, and the epiglottis. Ventricular fold oscillation (or ventricular phonation) in non-pathological cases occurs simultaneously with vocal fold oscillation (Fuks et al. 1998; Lindestad et al. 2002). It is most familiar in the ethnic si

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