The Effect of Frequency and Intensity of /a/ Phonation on the Result of Acoustic Analysis

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J Korean Soc Laryngol Phoniatr Logop > Volume 8(1); 1997 > Article

Journal of The Korean Society of Laryngology, Phoniatrics and Logopedics 1997;8(1): 12-17.

발성시 음도 및 강도의 변화가 음성분석검사 결과에 미치는 영향

손영익, 윤영선, 권중근, 추광철

성균관대학교 의과대학 이비인후과학교실, 삼성서울병원

The Effect of Frequency and Intensity of /a/ Phonation on the Result of Acoustic Analysis

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ABSTRACT

Measuring phonatory stability using MDVP(Multi-dimensional voice program, Kay Elemetrics Corp., NJ, USA) are becoming popular in many Korean clinics and laboratories, yet questions about standardization and reference values have remained. The purpose of present study was to examine the effects of frequency and intensity variation on the results of acoustic analysis related to phonatory stability. Twenty young adults(ten females and ten males) were asked to sustain vowel /a/ for more than 3 seconds under 9 different pitch and loudness conditions. Using MDVP, nine voice samples were analyzed, and jitter percent, fundamental frequency variation, shimmer percent, peak amplitude variation, noise to harmonic ratio, amplitude tremor intensity index, and degree of subharmonics were compared. The results showed that intensity changes can significantly affect various phonatory stability measures, and the lowest perturbation values can be obtained from slightly louder(10dB) phonatory condition than comfortable level phonation.

KEY WORDS： Frequency;Intensity;Phonatory stability;Comfortable level;