Objective evaluation of voice timbre in autophonic production

NAKAYAMA Ichiro, OKADA Toshie, NAKAGAWA Mikaho

What sort of voice timbre do we perceive in autophonic production, hearing our own voice during phonation, and can we measure the timbre itself quantitatively ? The authors have showed that the timbre can be examined quantitatively as a function of frequency using a delayed feedback method created by the author, in which a sound was generated by the subjects themselves so as to simulate the sound through a loud-speaker as accurately as possible in its timbre and loudness to the sound perceived during phonation. However, the judgement of similarity of voice timbre between the perceived and the simulated sounds was left to the subjects themselves, not objectively, because the voice timbre in autophonic production can not be examined by any one other than the speaker oneself. The purpose of the present study is to show a method to evaluate the similarity between the simulated and perceived sounds objectively, when male subjects phonated a vowel/a/in the spoken mode. Two similarity judgement tests were conducted, one (TestA) between the perceived and the simulated ones, and the other (TestB) between the simulated and the processing sounds, with an amplitude of a frequency band of the simulated sound altered, using the same criterion of the judgement of the similarity as in TestA. Through these tests, it was found objectively that the similarity between the simulated and perceived sounds was fairly well.

Objective evaluation of voice timbre in autophonic production

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