Evaluation of hypernasality in vowels using voice low tone to high tone ratio

The Cleft Palate-craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association
Guoshe LeeSherry Fu

Abstract

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. 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. Eight subjects with hypernasality caused by palatal fistula or velopharyngeal insufficiency. VLHR, nasalance, and hypernasality rating score. 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). VLHR correlat...Continue Reading

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May 19, 2009·Current Opinion in Otolaryngology & Head and Neck Surgery·Robert J Shprintzen, Eileen Marrinan
Jul 12, 2011·The Cleft Palate-craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association·Yun-Jeng TsaiGuo-She Lee
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Jun 17, 2016·Journal of Communication Disorders·Kim BettensKristiane M Van Lierde
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Sep 17, 2019·Biomedizinische Technik. Biomedical Engineering·Jing ZhangLing He
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