口蓋裂音声の鼻音性の定量的評価

概要

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Cleft palate patients tend to nasalize non nasal phonemes. In order to evaluate their nasality, 5 Japanese vowels pronounced by 7 cleft lip and palate patients are investigated utilizing two spectrum analysis methods. The one is linear prediction analysis, and the other is homomorphic analysis. From the spectrum analysis of the vowel/i/, a distinct peak of spectral envelope is found invariably in the frequency range between the first formant and the second one, which will be refered to as "nasality component". Three parameters (Rn, Ln, Pn) are calculated from this component for the purpose of evaluating the nasality quantitatively. Values of the three parameters decrease or vanish when the speech aid is attached on the palate, and the two parameters (Rn and Pn) have high positive correlation with the perceived nasality level which is estimated by the hearing test. From above results, it is concluded that the "nasality components" extracted by the two spectrum analysis methods will provide a sound basis for clinical appraisal of the nasality in cleft palate speech.
社団法人日本音響学会の論文
1985-02-01