Interaction mechanisms between glottal source and vocal tract in pitch glides

Tiina Murtola, Jarmo Malinen

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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A computational model for vowel production has been used to simulate rising pitch glides in the time domain. Such glides reveal multi-faceted nonlinear system behaviour when the fundamental frequency fo is near the first vocal tract resonance fR1. There are multiple physical mechanisms for how the acoustic field in the vocal tract can interact with vocal fold dynamics causing this behaviour. The model used in this work includes the direct impact of the acoustic pressure on the transversal plane of the vocal folds and an acoustic perturbation component to the glottal flow. Simulations indicate that both of these mechanisms, when applied separately, cause similar perturbations in phonation parameters when fo crosses fR1. Enabling both mechanisms simultaneously tends to make the separately emerging features more prominent. In simulated glottal flow waveforms, the tendency towards a formant ripple increases when acoustic feedback to glottal flow is enabled, whereas the phenomenon occurs more rarely as a result of the direct acoustic pressure to vocal folds. In all cases, the formant ripple is more pronounced for frequencies below fR1.

Original languageEnglish
Title of host publicationProceedings of Interspeech
PublisherInternational Speech Communication Association (ISCA)
Number of pages5
Publication statusPublished - 1 Jan 2018
MoE publication typeA4 Article in a conference publication
EventInterspeech - Hyderabad International Convention Centre, Hyderabad, India
Duration: 2 Sept 20186 Sept 2018

Publication series

NameProceedings of the Annual Conference of the International Speech Communication Association, INTERSPEECH
PublisherInternational Speech Communication Association
ISSN (Print)2308-457X


Internet address


  • Modal locking
  • Source-filter interaction
  • Vowel production model


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