Abstract/Details

Acoustic coupling in phonation and its effect on inverse filtering of oral airflow and neck surface acceleration


2010 2010

Other formats: Order a copy

Abstract (summary)

Many aspects of the coupling between vocal fold motion, glottal airflow, and resulting sound waves remain unexplored, particularly during incomplete glottal closure. In addition, this coupling has been associated with distortions in the estimates of glottal parameters obtained from neck acceleration measurements, thus affecting the ambulatory assessment of vocal function. This acoustic coupling and its effects on inverse filtering of oral airflow and neck surface acceleration during vowel production were investigated using numerical and experimental methods. A lumped element self-oscillating model was extended to include different types of incomplete glottal closure, which provided an enhanced simulation tool that mimicked normal and hyperfunctional voices. Novel in vivo measurements and analyses of vocal fold tissue instabilities due to acoustic coupling were obtained using synchronous laryngeal high-speed videoendoscopy recordings. These observations suggested that instabilities differed at the vocal fold tissue level from those where no strong coupling was present, but classified each as subcritical Hopf bifurcations. These findings supported the concept of describing interactions within the voice production system based on acoustic impedance representations. In addition, an impedance-based inverse filtering approach with time-varying glottal coupling demonstrated how source-tract interactions skewed and altered the glottal pulses. Based on these observations, a subglottal inverse filtering scheme for neck surface acceleration was proposed and evaluated, yielding estimates of glottal aerodynamic parameters with accuracy comparable to that of standard pneumotachograph measurements and closed-phase inverse filtering.

Indexing (details)


Subject
Speech therapy;
Biomedical engineering;
Electrical engineering
Classification
0460: Speech therapy
0541: Biomedical engineering
0544: Electrical engineering
Identifier / keyword
Health and environmental sciences; Applied sciences; Acoustic coupling; Inverse filtering; Neck acceleration; Oral airflow; Phonation; Speech production; Vocal folds
Title
Acoustic coupling in phonation and its effect on inverse filtering of oral airflow and neck surface acceleration
Author
Zanartu Salas, Matias
Number of pages
225
Publication year
2010
Degree date
2010
School code
0183
Source
DAI-B 72/05, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781124525211
Advisor
Wodicka, George R.
Committee member
Hillman, Robert E.; Huber, Jessica E.; Mongeau, Luc; Talavage, Thomas M.
University/institution
Purdue University
Department
Electrical and Computer Engineering
University location
United States -- Indiana
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3444545
ProQuest document ID
859003709
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/859003709
Access the complete full text

You can get the full text of this document if it is part of your institution's ProQuest subscription.

Try one of the following:

  • Connect to ProQuest through your library network and search for the document from there.
  • Request the document from your library.
  • Go to the ProQuest login page and enter a ProQuest or My Research username / password.