摘要
听觉前向掩蔽效应是听觉动态非线性的重要表现， 也是听觉适应机制的重要表现， 由此产生听觉前后向参考编码机制，而传统的语音信号处理机制是帧与帧独立的线性处理方式，所以不能反映实际听觉系统的动态非线性适应特性。传统的听觉模型对这种动态非线性适应机制的模拟是通过自适应调节听觉耳蜗滤波器的增益来完成的， 这不管在计算量上还是在滤波器的稳定性设计上都有其缺陷。我们根据听觉的生理学机制，建立前馈自适应模型，从输入输出特性曲线上引出静态增益曲线，再在静态增益曲线上引入动态过程，由此建立的数学模型，利用心理学试验数据得到模型参数。试验结果表明，该模型能够很好地预测前向掩蔽效应，对听觉的动态非线性适应机制是一种很好的解释。
Forward masking effect is a very important aspect of the nonlinear dynamic property of auditory system, and is also a very important function of the adaptive mechanism of auditory system which nesrestults in the referenced coding strategy for stimulation. But, traditional speech signal processing methods are linear and are processing frame independently. In these traditional methods adjustment of gain of adaptive filters is used to perform the task of dynamic nonlinear adaptire mechanism, so that there exist not only trouble cansed by heavy computational complexity, but also defects in design for stalility of filters. Besides, they can not nefleat the neal property out anditory function. Based on the mechanism of real auditory system, a mathematical model is established in which a forward feed back pash is introduced and the static gain curve is derived from input-output (I/O) curve, therefore the model has dynamic property.The parameters of the model are oltained from the data of psychology experiments. of showes that this dynamic adaptive model is a good explanation for the forward masking effect in the auditory system.
出处
《生物物理学报》
CAS
CSCD
北大核心
1999年第4期702-709,共8页
Acta Biophysica Sinica
基金
国家自然科学基金!重点项目支持
No .69635020
关键词
听觉模型
耳蜗基底膜
外毛细胞
动态非线性
Auditory model Basilar membrane Outer hair cell Nonlinear dynamic forward Masking Effect
