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针对WOLA(weighted overlap-add)滤波器组在数字助听器多通道处理中的应用,本文提出了一个满足该领域要求的具体的设计准则。根据这一准则,可用窗函数法进行滤波器设计,并把问题简化为对窗长度的选取。对线性扫频信号和语音信号多通道放大两种情况进行了仿真,结果表明,适当选取窗长度,滤波器组输出信号将符合要求并且无混迭。
Aiming at the application of WOLA (weighted overlap-add) filter banks in multichannel digital hearing aids, this paper presents a specific design criterion to meet the requirements of this field. According to this criterion, the window function method can be used to design the filter, and the problem can be simplified to the length of the window. Simulations were performed on both the linear sweep signal and the multi-channel amplification of the speech signal. The results show that the output of the filter bank will meet the requirements and no aliasing if the window length is selected properly.