Abstract
A method of objectively evaluating the voice quality of esophageal speech is described in this paper. We used the vowel/a/ of 27 esophageal speakers as a voice sample.As judged from perceptual impressions, the voice samples were ranked by the paired comparison method. Acoustic parameters such as maximum phonation time, fluctuation of intensity and periodicity of vibration were examined. We compared the perceptual ranking and those three parameters by non-parametric statistical methods. There was a significant correlation between the last two parameters and the perceptual ranking. Low fluctuation (less than 10dB in 500msec from the voice on set) and periodic vibration were assumed to be a standard for the good voice quality of esophageal speech.
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