Modeling control mechanism generating rise-fall pattern in F_O contour

This paper studies the stratege of modeling the control mechanism generating F0 contour of speech signal. Based on some hypotheses about dynamic characteristics of vocal cord, the complex laryngeal mechanism relative to the FO is simplified to be a feasible physical model, furthermore, a functional model for the control mechanism is proposed to generate the RisesFall pattern of FO contour.With motor commands defined by the proposed model two kinds of basic Rise-Fall feature pattern result.On the logarithmic scale of FO versus time the local F0 contour is approximated by the sum of these patterns generated by independent commands. Experimental results in analyzing and synthesizing the F0 contour of Chinese utterances indicate that, the real FO contour can be approximated very closely by the model, good correlation also exist between model parameters and FO patterns. Therefore, the proposed model will have a contributing to the summarizing of prosodic rules, and lay a foundation for the synthesis of the F0 contour by rule.