Theoretical Framework for Modeling Ingressive Phonation
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Abstract
Researchers in vocal acoustics have used computer simulations of single and multi-mass models of the human vocal folds to study human phonation for over 40 years. They have successfully given insight into different voice qualities and registers as well as the irregular phonation associated with pathologies. This study hypothesizes that current techniques for simulating egressive phonation will also lead to self-oscillation of the vocal folds upon changing the pressure and flow orientation. Through symmetrical reasoning, well-established aeroelastic relations for multi-mass vocal fold models are generalized to cases where the lung pressure is negative and the air flows into the trachea. The pitch, flow rates, and phonation ranges are compared between the ingressive and egressive conditions. A modal analysis is used to understand the differences between the two approaches. This study shows that current techniques can be utilized to simulate ingressive phonation and provides a unified framework for both kinds of phonation.