An Investigation of Acoustic Back-Coupling in Human Phonation on a Synthetic Larynx Model
Näger C, Kniesburges S, Tur B, Schoder S, Becker S (2023)
Publication Type: Journal article
Publication year: 2023
Journal
Book Volume: 10
Pages Range: 1343
Issue: 12
DOI: 10.3390/bioengineering10121343
Abstract
In the human phonation process, acoustic standing waves in the vocal tract can influence the fluid flow through the glottis as well as vocal fold oscillation. To investigate the amount of acoustic back-coupling, the supraglottal flow field has been recorded via high-speed particle image velocimetry (PIV) in a synthetic larynx model for several configurations with different vocal tract lengths. Based on the obtained velocity fields, acoustic source terms were computed. Additionally, the sound radiation into the far field was recorded via microphone measurements and the vocal fold oscillation via high-speed camera recordings. The PIV measurements revealed that near a vocal tract resonance frequency fR, the vocal fold oscillation frequency fo (and therefore also the flow field’s fundamental frequency) jumps onto fR. This is accompanied by a substantial relative increase in aeroacoustic sound generation efficiency. Furthermore, the measurements show that fo-fR-coupling increases vocal efficiency, signal-to-noise ratio, harmonics-to-noise ratio and cepstral peak prominence. At the same time, the glottal volume flow needed for stable vocal fold oscillation decreases strongly. All of this results in an improved voice quality and phonation efficiency so that a person phonating with fo-fR-coupling can phonate longer and with better voice quality.
Authors with CRIS profile
Christoph Näger
Lehrstuhl für Strömungsmechanik
Stefan Kniesburges
Bogac Tur Lehrstuhl für Hals-, Nasen- und Ohrenheilkunde Stefan Becker Lehrstuhl für Strömungsmechanik
Bogac Tur Lehrstuhl für Hals-, Nasen- und Ohrenheilkunde Stefan Becker Lehrstuhl für Strömungsmechanik
Involved external institutions
Austria (AT)How to cite
APA:
Näger, C., Kniesburges, S., Tur, B., Schoder, S., & Becker, S. (2023). An Investigation of Acoustic Back-Coupling in Human Phonation on a Synthetic Larynx Model. Bioengineering, 10, 1343. https://dx.doi.org/10.3390/bioengineering10121343
MLA:
Näger, Christoph, et al. "An Investigation of Acoustic Back-Coupling in Human Phonation on a Synthetic Larynx Model." Bioengineering 10 (2023): 1343.
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