逆対称声道関数と母音特徴抽出

概要

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This paper describes the property of antimetrical vocal tract area function and the vowel feature extraction. In the first half of the paper, the validity of the assumption of antimetricity of vocal tract characteristics on utterance of vowels is examined by the discrimination rate among the Japanese vowels uttered in isolation by 10 adult males. The discrimination rate of antimetrical vocal tract functions is higher than that of the almost antimetrical one and the one estimated by adaptive inverse filtering method. The phonetic features of vocal tract are more clearly described under the assumption of antimetricity. In the latter half of the paper, the linear model of the antimetrical vocal tract functions is constructed. In case of vowels uttered in isolation, the antimetrical vocal tract functions are approximated by2-dimensional linear model with normalized mean squared error of 2 percent. In case of vowels uttered continuously, the normalized mean squared error of the model is3. 4per cent. The phonetic features of both isolated and continuous vowels can be distinctively described by 2-dimensional linear model.
社団法人日本音響学会の論文
1983-03-01