KMID : 0384020110220010040
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Journal of the Korean Society of Logopedics and Phoniatrics 2011 Volume.22 No. 1 p.40 ~ p.46
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A Comparison of Acoustic Parameters between Vocal Fold Bowing and Vocal Fold Polyp
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Kang Young-Ae
Yoon Yeo-Hoon Yoon Kyu-Chul Seong Cheol-Jae
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Abstract
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Background and Objectives : Vocal fold bowing is an organic voice disorder that is associated with an abnormal structure of the vocal folds whereas vocal fold polyp is a functional voice disorder caused by an abnormal use of the vocal folds. Both types of vocal folds share a common property in that they make one¡¯s voice breathy or strained. The purpose of this study is to compare voice from two types of vocal folds and to offer information of clinical importance.
Materials and Method: Vocal fold bowing and vocal fold polyp groups consisted of 7 male subjects, respectively. All subjects recorded /a/ in the state of measuring MPT (maximum phonation time), repeating 3 times, by a voice recorder (48 kHz sampling rate; 24 bit quantization). They answered the questions of K-VHI. Time domain parameters (such as perturbation parameters including HNR, Jitter, etc.) were calculated for the whole duration of /a/ and those of the frequency domain were measured in initial 40 ms and stable 40 ms of /a/, respectively. Mann-Whitney V-test was used for the time domain parameters and K-VHI survey, and Wilcoxon signed rank test was applied to the frequency domain parameters (H1, H2, H1-H2).
Results: For K-VHI survey and the time domain analysis, there was no significant difference between bowing and polyp group. For frequency domain analysis, H1 and H2 showed a significantly different result between two groups. Vocal fold bowing group has longer duration and lower intensity than that of vocal fold polyp group in the ¡¯aspirated interval¡¯, which could be observable prior to ordinary vowel oscillation.
Conclusion: Both groups seem to show breathy voice. This could be referred on the basis of the value of H1-H2. The K-VHI survey says that subjects with vocal fold bowing feel more uncomfortable than subjects with vocal fold polyp.
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KEYWORD
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Vocal fold bowing, Vocal fold polyp, Aspiration, Harmonics, K-VHI
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