| Acoustic impedance of an artificially lengthened and constricted vocal tract. | |
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MedLine Citation:
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PMID: 11130104 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Voice training techniques often make use of exercises involving partial occlusion of the vocal tract, typically at the anterior part of the oral cavity or at the lips. In this study two techniques are investigated: a bilabial fricative and a small diameter hard-walled tube placed between the lips. Because the input acoustic impedance of the vocal tract is known to affect both the shaping of the glottal flow pulse and the vibrational pattern of the vocal folds, a study of the input impedance is an essential step in understanding the benefits of these two techniques. The input acoustic impedance of the vocal tract was investigated theoretically for cases of a vowel, bilabial occlusion (fully closed lips), a bilabial fricative, and artificially lengthening the tract with small diameter tubes. The results indicate that the tubes increase the input impedance in the range of the fundamental frequency of phonation by lowering the first formant frequency to nearly that of the bilabial occlusion (the lower bound on the first formant) while still allowing a continuous airflow. The bilabial fricative also has the effect of lowering the first formant frequency and increasing the low-frequency impedance, but not as effectively as the extension tubes. |
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Authors:
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B H Story; A M Laukkanen; I R Titze |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Journal of voice : official journal of the Voice Foundation Volume: 14 ISSN: 0892-1997 ISO Abbreviation: J Voice Publication Date: 2000 Dec |
Date Detail:
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Created Date: 2000-12-20 Completed Date: 2001-03-01 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8712262 Medline TA: J Voice Country: United States |
Other Details:
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Languages: eng Pagination: 455-69 Citation Subset: IM |
Affiliation:
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National Center for Voice and Speech, Wilbur James Gould Voice Research Center, Denver Center for the Performing Arts, Colorado, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Impedance Tests* Humans Models, Biological Phonation / physiology* Phonetics Voice / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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P60-DC00976/DC/NIDCD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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