文章摘要
蔡宇,侯朝焕,原建平,鄢社锋.适用于助听器语音信号处理的DFT调制滤波器组设计[J].声学技术,2012,(5):517~521
适用于助听器语音信号处理的DFT调制滤波器组设计
Design of DFT modulated filter bank for speech processing in hearing aids
投稿时间:2011-08-07  修订日期:2011-12-01
DOI:10.3969/j.issn1000-3630.2012.05.014
中文关键词: DFT调制滤波器组  等纹波法  WOLA结构  语音信号处理
英文关键词: DFT modulated filter bank  equiripple method  WOLA structure  speech signal processing
基金项目:国家自然科学基金资助项目(60802072)
作者单位E-mail
蔡宇 中国科学院声学研究所,北京 100190
中国科学院研究生院,北京 100049 
caiyu@mail.ioa.ac.cn 
侯朝焕 中国科学院声学研究所,北京 100190  
原建平 中国科学院声学研究所,北京 100190  
鄢社锋 中国科学院声学研究所,北京 100190  
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中文摘要:
      提出了一种近似重构、过采样DFT调制滤波器组的设计方法.根据滤波器组的系统失真和输出混迭方面的要求,构造一个简单的目标函数,并采用等纹波法优化设计原型滤波器.与现有方法相比,该设计方法将复杂的非线性优化问题转化为对单一参数的选取,简化了设计过程,并且可在满足DFT调制滤波器组设计准则的条件下使得通带范围内误差逼近最小.利用加权叠接相加(Weighted Overlap and Add, WOLA)的快速实现结构,使整个系统更加高效、易行,可用于助听器语音信号分频带处理与综合.
英文摘要:
      This paper proposes a simple method of designing an oversampled, near-perfect reconstruction DFT modulated filter bank. According to the requirement of system distortion and aliasing power, a simple objective function is introduced, and the prototype filter is designed with the equiripple method. Compared with traditional methods, the proposed method optimizes a single parameter instead of the complex nonlinear optimization, and the design process is simplified. This approach can minimize the passband error under the filter-bank design criteria. By using weighted overlap and add (WOLA) structure, the system can be implemented efficiently, which is suitable for speech signal analysis and synthesis in hearing aids.
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