Reference : Modal Locking Between Vocal Fold Oscillations and Vocal Tract Acoustics
Scientific journals : Article
Life sciences : Anatomy (cytology, histology, embryology...) & physiology
Computational Sciences
Modal Locking Between Vocal Fold Oscillations and Vocal Tract Acoustics
Murtola, Tiina [Aalto University]
Aalto, Atte mailto [University of Luxembourg > Luxembourg Centre for Systems Biomedicine (LCSB) > >]
Malinen, Jarmo [Aalto University > Department of Mathematics and Systems Analysis]
Aalto, Daniel [University of Helsinki > Institute of Behavioural Sciences > > ; University of Alberta > Speech Communication and Disorders]
Vainio, Martti [University of Helsinki > Institute of Behavioural Sciences]
Acta Acustica United with Acustica
S. Hirzel
Yes (verified by ORBilu)
[en] 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 [α, i] in the fundamental frequency (fo ) interval [145 Hz, 315 Hz]. The interval contains the first vocal tract resonance fR 1 and the first formant F 1 of [i] as well as the fractions of the first resonance fR 1 /5, fR 1 /4, and fR 1 /3 of [α]. The glide simulations reveal a locking pattern in the fo trajectory approximately at fR 1 of [i]. The resonance fractions of [α] produce perturbations in the pressure signal at the lips but no locking.

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