骨導音声の音響学的分析に関する研究--臨床応用を中心として (三吉康郎教授開講20周年記念論文集)

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Bone-conducted vowels and consonants were picked up by a vibration transducer of the acceleration type applied to the upper jaw. They were analysed acoustically with respect to the volume level of vibration on the maxilla, wave forms and spectral envelope.Fifty-six subjects included 19 with insufficient closure of the nasopharynx, 21 with maxillary lesions and 19 patients who received various kinds of maxillofacial surgery.The results are summarized as follows. In those with insufficiency of nasopharyngeal closure, it was found that 1) the volume level of vibration depended on the condition of the palate; 2) the energy used to produce the phonation of the vowels/e/ and /i/ was transmitted through the hard palate; 3) regarding the wave form, the emphasis on the component of nasal consonants was clearly recognized in abnormal patients, but not in those with omission. Thus, the volume level of vibration and the emphasis on the component of nasal consonants could be used as one of the objective parameters of clinical evaluation of the repair of the cleft palate with articulation disorder.In patients with abnormal maxilla, it was shown that 1) the volume level of vibration was strongly dependent on the size of the defect of the maxillary bone, but not on the contents of the antrum or location of its defect. 2) spectral analysis revealed that the peak wave (2, 500Hz) during the phonation of /e/ and /i/ was influenced by the location of the defect of the maxilla and the contents of the antrum. 3) The emphasis on the components of nasal consonants was not dependent on the abnormality of the maxilla. It is suggested that acoustic analysis of speech signals picked up at the surface of the head and neck is useful as one of the diagnostic parameters of the maxillopalatal disorders.
耳鼻咽喉科臨床学会の論文

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谷口知恵子
三重大学医学部耳鼻咽喉科学教室

骨導音声の音響学的分析に関する研究--臨床応用を中心として (三吉康郎教授開講20周年記念論文集)

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