Alaryngeal voice quality was investigated by means of nonparametric statistics. Sixteen alaryngeal and four normal speakers produced vowel segments of /e/, which were randomized and presented to twenty normal listeners. The listeners rated psychoacoustical quality of the voices on seven-point scales consisting of twelve pairs of polar-opposite adjectives. Four acoustical parameters were measured from each of the voices in order to acoustically interpret the psychoacoustical quality. Based on nonparametric procedures, some significant differences in the rating scores were detected in reference to the speakers, to the voicing methods, to the listeners and to the rating scales in use. And some of these differences closely correlated with perturbation quotients of pitch periods and of amplitudes. These results obtained in this paper will serve as basic data for the enhancement of alaryngeal voice quality.
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