Modal Locking Between Vocal Fold Oscillations and Vocal Tract Acoustics

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http://hdl.handle.net/10138/309086

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Murtola , T , Aalto , A , Malinen , J , Aalto , D & Vainio , M 2018 , ' Modal Locking Between Vocal Fold Oscillations and Vocal Tract Acoustics ' , Acustica United with Acta Acustica , vol. 104 , no. 2 , pp. 323-337 . https://doi.org/10.3813/AAA.919175

Title: Modal Locking Between Vocal Fold Oscillations and Vocal Tract Acoustics
Author: Murtola, Tiina; Aalto, Atte; Malinen, Jarmo; Aalto, Daniel; Vainio, Martti
Contributor: University of Helsinki, University of Alberta
University of Helsinki, Phonetics
Date: 2018-03-01
Language: eng
Number of pages: 15
Belongs to series: Acustica United with Acta Acustica
ISSN: 1610-1928
URI: http://hdl.handle.net/10138/309086
Abstract: During voiced speech, vocal folds interact with the vocal tract acoustics. The resulting glottal source-resonator coupling has been observed using mathematical and physical models as well as in in vivo phonation. We propose a computational time-domain model of the full speech apparatus that contains a feedback mechanism from the vocal tract acoustics to the vocal fold oscillations. It is based on numerical solution of ordinary and partial differential equations defined on vocal tract geometries that have been obtained by magnetic resonance imaging. The model is used to simulate rising and falling pitch glides of [alpha, i] in the fundamental frequency (f(o)) interval [145 Hz, 315 Hz]. The interval contains the first vocal tract resonance f(R1) and the first formant F-1 of [i] as well as the fractions of the first resonance f(R1)/5, f(R1)/4, and f(R1)/3 of [alpha]. The glide simulations reveal a locking pattern in the f(o) trajectory approximately at f(R1) of [i]. The resonance fractions of [alpha] produce perturbations in the pressure signal at the lips but no locking.
Subject: 111 Mathematics
6161 Phonetics
AREA FUNCTIONS
2-MASS MODEL
FUNDAMENTAL-FREQUENCY
SPEECH PRODUCTION
AIR-FLOW
PHONATION
PRESSURE
SIMULATION
PARAMETERIZATION
RESONANCES
AREA FUNCTIONS
2-MASS MODEL
FUNDAMENTAL-FREQUENCY
SPEECH PRODUCTION
AIR-FLOW
PHONATION
PRESSURE
SIMULATION
PARAMETERIZATION
RESONANCES
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