Paper Info
Title
Change In Aeroacoustic Sound Mechanism During Sibilant Sound With Different Velopharyngeal Opening Sizes
Abstract
The velopharyngeal valve regulates the opening between the nasal and oral cavities. The lack of complete closure is especially problematic in speech because inappropriate leakage of airflow and/or sound into the nasal cavity causes abnormal sound production and increased nasality. The purpose of this study is to use the large eddy simulation approach to examine changes in sound source mechanisms as the size of the opening changes during the production of a sibilant sound. The baseline geometry of the model is based on the pharyngeal airway of a subject having a small velopharyngeal opening while sustaining a sibilant sound. Modifications to the model are done by systematically widening or narrowing the opening (all else being equal). Results show that acoustic energy in the nasal cavity is directly related to the size of the velopharyngeal opening and that there is a critical size where the magnitude of Lighthill's acoustics source in the nasal cavity is maximized. The far-field acoustic energy and its correlation with the sound source mechanisms are also dependent on the size of the velopharyngeal opening.
Year
DOI
Venue
2021
10.1007/s11517-021-02356-4
MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING
Keywords
DocType
Volume
Nasal emission, Velopharyngeal opening, Turbulence sound, Large eddy simulation
Journal
59
Issue
ISSN
Citations 
4
0140-0118
0
PageRank 
References 
Authors
0.34
0
2
Name
Order
Citations
PageRank
Elias Sundström100.34
Liran Oren200.34