Document Detail


Evaluation of hypernasality in vowels using voice low tone to high tone ratio.
MedLine Citation:
PMID:  19115797     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: The voice low tone to high tone ratio (VLHR) is defined as the power ratio of low frequency to high frequency energy obtained by dividing the voice spectrum with a specific cutoff frequency. In a previous study, VLHR correlated significantly with nasalance and perceptual rating of hypernasality for a single vowel. The methodology was optimized in this study by investigating the correlations among other vowels. DESIGN: Voice signals of six sustained vowels vocalized by subjects with hypernasality were collected. Vowel nasalance was obtained with a nasometer, and hypernasality rating scores were provided by two speech-language pathologists. The VLHRs calculated using different cutoff frequencies were correlated with nasalance and hypernasality rating scores. PARTICIPANTS: Eight subjects with hypernasality caused by palatal fistula or velopharyngeal insufficiency. MAIN OUTCOME MEASURES: VLHR, nasalance, and hypernasality rating score. RESULTS: The correlation of VLHR with nasalance and hypernasality rating was most significant using a cutoff frequency of 600 Hz. The correlation of VLHR with nasalance was significant (r = .62, p < .01, Pearson's correlation), as was the correlation of VLHR with hypernasality score (Spearman's rank correlation coefficient = .62, p < .01). CONCLUSIONS: VLHR correlated significantly with nasalance and hypernasality in the six sustained vowels and may provide another quantitative index for the evaluation of hypernasality in sustained vowels.
Authors:
Guo-She Lee; Ching-Ping Wang; Sherry Fu
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-05-15
Journal Detail:
Title:  The Cleft palate-craniofacial journal : official publication of the American Cleft Palate-Craniofacial Association     Volume:  46     ISSN:  1055-6656     ISO Abbreviation:  Cleft Palate Craniofac. J.     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2008-12-31     Completed Date:  2009-04-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9102566     Medline TA:  Cleft Palate Craniofac J     Country:  United States    
Other Details:
Languages:  eng     Pagination:  47-52     Citation Subset:  D; IM    
Affiliation:
Department of Otolaryngology, Faculty of Medicine, School of Medicine, National Yang-Ming University, Taipei City 112 Taiwan. gslee@ym.edu.tw
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MeSH Terms
Descriptor/Qualifier:
Adult
Female
Humans
Male
Middle Aged
Nasal Obstruction / diagnosis*
Oral Fistula / complications
Phonation*
Respiratory Tract Fistula / complications
Rhinomanometry*
Sound Spectrography
Speech Acoustics
Velopharyngeal Insufficiency / complications
Vibration
Voice*
Voice Disorders / diagnosis*,  etiology
Voice Quality*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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