副鼻腔共鳴に関する実験的研究
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概要
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By using a plastic model of human vocal tract, a study has been carried out on the mechanism of the resonance of paranasal sinus.At first, paranasal (maxillary and sphenoid) sinus models with various volumes and several kinds of ostium diameter are coupled to the model vocal tract. In this manner the effects of coupling of the model sinuses on the frequency characteristics of the model vocal tract are examined.Next, applying this model vocal tract coupled with paranasal sinuses, hearing impression of resonance sounds have been tested for 5 persons with normal hearing.The results have revealed the following spectral features-when paranasal sinus models have coupled with the vocal tract model:(1)a gentle rise in the characteristics of low tone range;(2)a relatively flat fall and sharp valley caused by the antiresonance of paranasal sinus in the middle tone range, and (3) a comb-tooth-like rise in the characteristics of high tone range. These features have been theoretically verified from acousticophysical viewpoint on the basis of considerations on electrical analogs and susceptance-frequency graphs.Through discussions on the relationship between the spectral patterns and hearing impressions of resonance sounds, the author has arrived in the following perceptions: There can be seen in the item (1), a quantative-spacial impression; in the item (3), a bright impression being potentiated ; and a beautiful-emotional impression by the co-ordinate effects of (1), (2) and (3).Furthermore approximately identical results are also obtained in the clinical observations on normal control group of 8 persons in comparing the nasal sounds both before and after the blocking of the resonance of paranasal sinus.From these results it is assumed that the paranasal sinuses give u favorable effect on our voice, particularly these give beautiful and quantitative impressions to the tone of voice as resonating chambers.
- 社団法人 日本耳鼻咽喉科学会の論文