Modeling control mechanism generating rise-fall pattern in F₀ 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 F₀ is simplified to be a feasible physical model,furthermore,a functional model for the control mechanism is proposed to generate the RisesFall pattern of F₀ contour.With motor commands defined by the proposed model two kinds of basic Rise-Fall feature pattern result.On the logarithmic scale of F₀ 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 F₀ contour can be approximated very closely by the model,good correlation also exist between model parameters and F₀ 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.