声道断面積関数の音声信号からの推定における声道路の損失およびインピーダンスの影響の検討

概要

論文の詳細を見る
On the plane wave assumption of sound wave propagation, a human vocal tract as a speech organ is well modelled as a cascade connection of many short acoustic tubes with different diameters, called acoustic tube model. The variation of the cross-sectional areas of the acoustic tubes is called as the area function and well characterizes the vocal tract response. The direct estimation of the area functions, when phonated speeches, from the speech signals is proposed by Wakita, on the assumption of loss-less transmission of sound in the tract. In reality, however, the effects of impedances in the practical vocal tract can not be ignored. Here is discussed through the simulation used the acoustic tube model how the estimated area functions by Wakita's approach are affected by the glottal impedance, the losses of viscosity and heat conductance of the air, vocal tract wall impedance and radiation impedance at the lips.
日本シミュレーション学会の論文
1999-06-15