Journal article
Nonlinear source-filter coupling in phonation: vocal exercises
The Journal of the Acoustical Society of America, Vol.123(4), pp.1902-1915
04/01/2008
DOI: 10.1121/1.2832339
PMCID: PMC2677316
PMID: 18396999
Abstract
Nonlinear source-filter coupling has been demonstrated in computer simulations, in excised larynx experiments, and in physical models, but not in a consistent and unequivocal way in natural human phonations. Eighteen subjects (nine adult males and nine adult females) performed three vocal exercises that represented a combination of various fundamental frequency and formant glides. The goal of this study was to pinpoint the proportion of source instabilities that are due to nonlinear source-tract coupling. It was hypothesized that vocal fold vibration is maximally destabilized when F(0) crosses F(1), where the acoustic load changes dramatically. A companion paper provides the theoretical underpinnings. Expected manifestations of a source-filter interaction were sudden frequency jumps, subharmonic generation, or chaotic vocal fold vibrations that coincide with F(0)-F(1) crossovers. Results indicated that the bifurcations occur more often in phonations with F(0)-F(1) crossovers, suggesting that nonlinear source-filter coupling is partly responsible for source instabilities. Furthermore it was observed that male subjects show more bifurcations in phonations with F(0)-F(1) crossovers, presumably because in normal speech they are less likely to encounter these crossovers as much as females and hence have less practice in suppressing unwanted instabilities.
Details
- Title: Subtitle
- Nonlinear source-filter coupling in phonation: vocal exercises
- Creators
- Ingo Titze - University of IowaTobias Riede - Denver Center for the Performing ArtsPeter Popolo - Denver Center for the Performing Arts
- Resource Type
- Journal article
- Publication Details
- The Journal of the Acoustical Society of America, Vol.123(4), pp.1902-1915
- DOI
- 10.1121/1.2832339
- PMID
- 18396999
- PMCID
- PMC2677316
- NLM abbreviation
- J Acoust Soc Am
- ISSN
- 0001-4966
- eISSN
- 1520-8524
- Grant note
- R01 DC004224 / NIDCD NIH HHS R01 DC004224-07 / NIDCD NIH HHS 5R01 DC004224-08 / NIDCD NIH HHS R01 DC004224-08 / NIDCD NIH HHS
- Language
- English
- Date published
- 04/01/2008
- Academic Unit
- School of Music; Communication Sciences and Disorders
- Record Identifier
- 9984719575902771
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