Abstract
Features of the X-ray microbeam method in the observation of articulatory movements are discussed, and an analysis of the dynamic characteristics of several speech organs based on X-ray microbeam data are presented. Experience with the use of the X-ray microbeam system has confirmed that a substantial reduction in X-ray dosage can be achieved. The movements of 6 pellets on the tongue and teeth are tracked at a rate of more than 100 frames per second, with an effective exposure area of about 1 cm 2 per frame, and with an exposure rate of 120 mR per minute in this area. Approximation of the movements of the pellets on the tongue, jaw and velum by means of the step response of a linear second order system has revealed that there are considerable differences in the values of the time constant among these speech organs. The duration of the step command also varies according to the type of vowel. These differences are reflected on the undershoot pattern and on the pattern of the coarticulation between consonant and vowel. The investigation of the movements of the velum has showed that a simultaneous observation of EMG is important for interpreting the pattern of the underlying motor control.
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