RESONANCE FREQUENCIES IN VOCAL TRACT LIKE WAVE-GUIDES
Résumé
Human voice production involves neuromuscular control of the vocal tract articulators resulting in complex time-varying vocal tract geometries associated with different speech sounds. In order to study and measure the acoustics of a dynamic vocal tract, a simplified two-parameter vocal tract model is investigated, which is suitable to be exploited in physical studies using a dynamic mechanical vocal tract replica allowing to impose both model parameters which are the position and degree of constriction. Acoustic resonance frequencies up to 5 kHz are modelled for the full parameter space. Results are compared to formants of human speakers for the simplified two-parameter vocal tract model including selected vocal tract geometries derived from MRI data. It is found that the agreement for the first three resonance frequencies for 10 vowels is within 10% since the mean relative error varies from 0.9% up to 9.1%. Overall, the simplified two-parameter vocal tract model allows to reproduce resonances up to 5 kHz. Advantages and limitations of the model are discussed.
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