应用数理方程反演提取语音特征

SPEECH SIGNAL PROCESSING BY MEANS OF INVERSION OF MATH-PHYSICS EQUATIONS

先讨论由语音信号反演声门激励函数，发现波沿非均匀声管传导既能产生新的频率（共振作用），也可抑制原有频率（滤波作用）．这说明目前用于语音处理基础的全极点ＬＰＣ模型并不能充分反映这些特征．然后研究如何直接从语音生成的偏微分方程模型出发，用反演方法提取一种新的语音特征参数代替ＬＰＣ作为研究各种语音处理的基础．

The inversion of glottis excitation from measuremnts of sound presure at lip is studied;showed that acoustic wave propagating through nonhomogeneous tracts not only yields,but also filters some frequencies,and LPC parameters based on only extreme points model can not characterize enough various voices.A new system of feature parameters are abstracted directly from partial differential equations generating voice.These parameters instead of LPC can be a basis for following study of speech signal processing.A fast algorithm for computing these parameters is given.