Kinematic formant-to-area mapping
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- 作者：Schoentgen ; J. ; Ciocea ; S.
- 关键词：Area function models ; Vocal tract eigenmodes ; Formant-to-area mapping
- 刊名：Speech Communication
- 出版年：1997
- 出版时间：May, 1997
- 年：1997
- 卷：21
- 期：4
- 页码：227-244
- 全文大小：1.26 M
文摘
This article presents a method of formant-to-area mapping consisting of the direct calculation of the time derivatives of the cross-sections and length of a vocal tract model so that the time derivatives of the observed formant frequencies and the model's eigenfrequencies match. The vocal tract model is a concatenation of uniform tubelets whose cross-section areas and lengths can vary in time. Time derivatives of the tubelet parameters are obtained by solving a linear algebraic system of equations. The derivatives are then numerically integrated to arrive at cross-section and length movements. Since more than one area function is compatible with the observed formant frequencies, pseudo-energy constraints are made use of to determine a unique solution. The results show that the formant-matched movements of the tubelet cross-sections and lengths are smooth, and that the agreement between the observed and model-generated formant frequencies is better than 0.01 Hz.