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KMID : 0311120080490040610
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Yonsei Medical Journal
2008 Volume.49 No. 4 p.610 ~ p.614
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Vocal Analysis Related to Changes in Frequency of Pure Tone Auditory Feedback
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Lee Sang-Hyuk
Ban Jae-Ho
Lee No-Hee
Jin Sung-Min
Lee Kyung-Chul
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Abstract
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Purpose: Many studies have shown that subjects show a change of vocal fundamental frequency (F0) when phonating subjects hear their vocal pitch feedback shifted upward or downward. This study was performed to demonstrate whether vocal parameters [F0, intensity, jitter, shimmer, and noise to harmonic ratio (NHR)] in normal males respond to changes in frequency of pure tone masking.
Materials and Methods: Twenty healthy male subjects participated in this study. Subjects vocalized /a/ vowel sounds while listening to a pitch- shift pure tone through headphones (upward pitch-shift in succession: 1kHz to 2kHz and 1kHz to 4kHz at 50dB or 80dB, respectively, downward pitch-shift in succession: 1kHz to 250Hz and 1kH to 500Hz at 50dB or 80dB, respectively).
Results: Vocal intensity, F0, was increased, whereas jitter was decreased as the pitch of pure tone was shifted upward. However, there was no correlation between shimmer and NHR with pitch-shift feedback for pure tones. Unlike vocal pitch- shift feedback in other studies, upward pitch-shift feedback of pure tones caused the vocal F0 and intensity to change in the same direction as pitch-shift.
Conclusion: The results of this study demonstrated that auditory kinesthetic feedback is affected by pitch-shift in pure tone.
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KEYWORD
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Pitch, feedback
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