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During voiced speech, the human vocal folds interact with the vocal tractacoustics. The resulting glottal source-resonator coupling has been observedusing mathematical and physical models as well as in in vivo phonation. Wepropose a computational time-domain model of the full speech apparatus that, inparticular, contains a feedback mechanism from the vocal tract acoustics to thevocal fold oscillations. It is based on numerical solution of ordinary andpartial differential equations defined on vocal tract geometries that have beenobtained by Magnetic Resonance Imaging. The model is used to simulate risingand falling pitch glides of [a, i] in the fundamental frequency (f_o) interval[150 Hz, 320 Hz]. The interval contains the first vocal tract resonance f_R1and the first formant F1 of [i] as well as the fractions of the first resonancef_R1/4 and fR1/3 of [a].  The simulations reveal a locking pattern of the fo-trajectory at f_R1 of [i]in falling and rising glides. The resonance fractions of [a] produceperturbations in the pressure signal at the lips but no locking. All theseobservations from the model behaviour are consistent and robust within a widerange of feasible model parameter values and under exclusion of secondary modelcomponents.

Modal locking between vocal fold and vocal tract oscillations: Simulations in time domain