Abstract
Fundamental frequency, intensity, and parameters of stability of Mandarin vowels─/i/, /u/ and /a/─were investigated through acoustic analysis. The results showed that the high vowels /i/ and /u/ were produced with higher fundamental frequency and intensity than the low vowel /a/. In terms of perturbation, /i/ was performed with lower jitter and shimmer values than /u/ and /a/. In terms of harmonics, /i/ and /u/ were produced with higher harmonic-to-noise ratio and Hl-H2 values than /a/ was. Based on the results, this study suggests that the low vowel /a/ should be used for voice evaluation since /a/ is generally produced with lower fundamental frequency and intensity and consequently more sensitive to phonatory instability than the high vowels are. Furthermore, /i/ and /u/ should be adopted as practice vowels in the course of voice therapy since they are phonated with higher stability and stronger harmonics than the low vowel /a/.
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