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Comparison of Voice Characteristics Before and After High-Caffeine Intake
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  • Journal title : Phonetics and Speech Sciences
  • Volume 7, Issue 4,  2015, pp.59-65
  • Publisher : The Korean Society of Speech Sciences
  • DOI : 10.13064/KSSS.2015.7.4.059
 Title & Authors
Comparison of Voice Characteristics Before and After High-Caffeine Intake
Lee, Areum; Kim, Eunyun; Yoo, Hyunji; Choi, Yaelin;
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This study was conducted to identify the differences in voice characteristic variables before and after taking a certain amount of high-caffeine. Linear PCM-M10 Recorder (SONY) was used for the recorder and basic frequency of the voice (Fo), frequency fluctuation rate (jitter), amplitude fluctuation rate (shimmer) and Signal-to-Noise Ratio (SNR) were measured using TF-32(University of Wisconsin-Madison, USA). First, prolonged phonation analysis results of /ah/ by male subjects showed the shimmer values after taking high-caffeine increased statistically significantly(p<.05) compared with before the intake and SNR values significantly decreased. (p<.05). On the other hand, female subjects didn`t show any statistically significant differences in all variables. Second, male subjects showed statistically significant increased shimmer values after the intake compared with before the intake at /ah/ of syllable `na` and /ah/ in `ra` in `autumn` paragraph (p<.05), and jitter values significantly increased at /ah/ in `ah` (p<.05). However, female subjects didn`t show any statistically significant differences in all variables. Results of this study showed that high-caffeine intake more affects male subjects than female subjects. In male subjects, shimmer and SNR changed at vowel prolonged phonation, /ah/, and study results showed that shimmer and SNR in `Autumn` paragraph /na/, /ra/ and jitter in /ah/ could be identified as the variables to show the voice change.
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