The temporal variation of the tongue profiles, derived from X-ray film data, are described in terms of those of four articulatory parameters. A filter model of movement for each tongue parameter is developed in which the impulse response is described by a damped, linear second-order system. The filter describing the system are assumed to be time invariant, and the excitation model is represented by a train of pulses. This model, excited by a limited but large number of pulses, produced a faithful synthesized movement. In this paper, our objective is not the faithful reproduction of the movement. Rather, our interest is to find out something about the nature of inter-articulator coordination during speech by analyzing the organization of pulses. Because of this objective, we determine the minimum number of pulses necessary to describe movements using the difference limen of for-mant frequencies as an acoustic criterion. The preliminary analysis suggests that this number depends on the phonetics features in the utterance, of which their realization is related to particular articulatory parameters.
Bibliographic reference. Bouabana, Soumya / Maeda, Shinji (1995): "Multipulse LPC modeling of articulatory movements: analysis and interpretation", In EUROSPEECH-1995, 1293-1296.