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KMID : 0917520030100010143
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Journal of Speech Sciences
2003 Volume.10 No. 1 p.143 ~ p.150
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Shimmer Change According to Fundamental Frequency Variation of Korean Normal Adults
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Pyo Hwa-Young
Sim Hyun-Sub
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Abstract
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The present study was performed to investigate change in shimmer according to F_0 variation precisely, and to offer suggestions for a clinical application.
The analysis for the present study was done by the fundamental frequency (F_0) and shimmer measurement results of the previous 120 Korean normal adults´ voice study of Pyo et al. (2002), used three vowels, /i/, /a/, and /u/.
Through the analysis of 60 female samples from the previous study, we found that F_0 of the vowels was the highest in /u/, and the lowest in /a/, but, on the contrary, shimmer was highest in /a/ and lowest in /u/. Thirty of 60 subjects showed such an inverse relationship between F_0 and shimmer, as a whole. In the vowel /a/, 47 of 60 subjects showed the increased F_0 and decreased shimmer, in /i/, 32 subjects, and in /u/, 33 subjects showed the same results.
The decrease in shimmer means the improvement of voice quality, so by these results, we expect to answer the question why the patients with spasmodic dysphonia can improve their voice quality with increased pitched voice production.
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