声道解析モデルを用いた医療応用技術の開発

抄録

In this research so far, we have proposed an Inverse analysis method that models acoustic phenomena in the vocal tract, which is the space from the vocal cords to the lips, with a concentrated mass model to estimate the vocal cord source wave. In addition, the validity of the Inverse analysis has been confirmed by experiments using a shaker and by a valve that self-oscillates due to the air flow. However, the valve used in the previous study was significantly different from the actual human vocal cord in shape and physical properties, and it was difficult to examine the physical mechanism of vocal cord self-excited vibration. In this paper, we created an artificial vocal cords that has the same shape and physical properties as human vocal cords, and made it possible to reproduce vocal cord vibration that is close to the actual phenomenon. In addition, we propose a vocal cord vibration analysis model that can be calculated with high accuracy and speed by performing modal analysis on the artificial vocal cords. Furthermore, dysphonia is reproduced by adding a pseudo lesion to the analysis model, and the result is compared with the result of the Inverse analysis of the actual voice of the patient.