Fourth European Conference on Speech Communication and Technology

Madrid, Spain
September 18-21, 1995

Direct Calculation of the Vocal Tract Area Function from Measured Formant Frequencies

Jean Schoentgen, S. Ciocca

Institute of Modern Languages and Phonetics, Université Libre de Bruxelles, Brussels, Belgium

This article presents a method for directly calculating the area function of a vocal tract model by means of measured formant frequencies. The model is a concatenation of uniform tubelets whose cross-sections and lengths may vary in time. The proposed method uses a mathematical expression that relates time derivatives of tubelet cross-sections, lengths and formant frequencies. The derivatives are numerically integrated to arrive at cross-section and length trajectories. When more than one model area function is compatible with observed formant frequencies, additional constraints are used to select a unique area function. Results show that form ant-matched trajectories of tubelet cross-sections arid lengths are smooth. The agreement between observed and model-generated formant frequencies is better than 0.01 Hz

Full Paper

Bibliographic reference.  Schoentgen, Jean / Ciocca, S. (1995): "Direct calculation of the vocal tract area function from measured formant frequencies", In EUROSPEECH-1995, 745-748.