Modeling of the Influence of Piriform Sinus on Vocal Tract Acoustic Characteristics of a Voice Trainer Based on CT Scan

0383697 - ÚT 2013 EG eng A - Abstrakt
Radolf, Vojtěch
Modeling of the Influence of Piriform Sinus on Vocal Tract Acoustic Characteristics of a Voice Trainer Based on CT Scan.
Abstracts of Presentations - IVCWVC 2012. Luxor, 2012 - (Kotby, M.). s. 1-1
[International Voice Congress of the World Voice Consorcium /5./. 27.10.2012-31.10.2012, Luxor]
Grant CEP: GA ČR GPP101/12/P579
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: vocal tract * piriform sinus * 1D wave equation
Kód oboru RIV: BI - Akustika a kmity

An analysis of acoustic resonant properties of human vocal tract (VT) model including piriform sinus (PS) cavities and analysis of more general testing mathematical models was done. The basic geometrical data for the model were obtained from computer tomography (CT). The computational method used was based on 1D acoustic wave equation, considering viscous losses, radiation impedance losses at the lips and applied on conical elements in frequency domain. The analysis revealed that connecting of side branches to the VT main channel cause small changes of original formant frequencies and formation of new pairs of resonances in the side branches only. Moreover spectral dips appear in transfer function of the main channel for side branches (PS) length less than 30 mm. The simplified 1D model is thus able to capture differences in acoustic variables of VT modified with PS.
Trvalý link: http://hdl.handle.net/11104/0216095