模型化F_O曲线中升降模式控制机制

本文研究产生语音信号中Ｆ０曲线的控制机制模型化策略。基于对声带动态行为建立的若干假设，提出一个将复杂的Ｆ０喉控制机制简化成可定量化的物理模型，进而导出一种产生局部Ｆ０升降模式的控制机制模型函数。由模型参数定义的驱动命令，控制产生两类基本升降特征模式，在对数标尺上，相互独立的驱动命令产生的升降模式代数和，近似给定的Ｆ０曲线局部特征。分析合成汉语普通话Ｆ０曲线结果表明，该模型函数不仅能高精度地拟合给定Ｆ０曲线的局部变化特征，而且主要模型参数同Ｆ０模式时序结构存在很好的相关性。提出的模型函数有助于韵律规则总结，为按规则合成Ｆ０曲线奠定坚实基础。

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.