Aerodynamic vocal functions under a systematic change in intensity

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This paper reports on the relation between voice intensity I^*[dB] and mean airflow rate U[cm^3/s] during the sustained phonation of vowel-like sound. In the experiment each subject was asked to increase the intensity of phonation in gradual steps from a"comfortable"level to higher degrees; without exceeding a level where discomfort would have resulted. During this process the fundamental frequency(F_0) was kept constant. A total of 18 sets of data were obtained from 4 females and 7 males. Values of intensity and airflow rate were plotted on an I^*vs. U^* display, where U^* indicates dB representation of U, i. e. U^*=20log(U/U_0), where U_0=1 cm^3/s. The relationship between I^* and U^* were represented both by a single line, and several line segments(up to three). Each line is represented by I^*=AU^*+B, and values of A were examined statistically for both single and three line approximations. A value of A=2 was observed most frequently for the single line approximations, regardless of female/male distinction. For the three line approximations, the median of A was 1. 5, 2. 9, and 2. 0, as obtained for low, medial, and high intensity regions, respectively. Overall patterns for the three line approximations were also examined, and it was found that S-shaped patterns appeared most frequently. These results will be useful for discussing the laryngeal control during the phonation.
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