中文摘要：

为改善多通道助听器滤波器分解导致语音质量下降的问题,提出了一种基于听力图的非均匀余弦调制滤波器组的有效设计方法.首先根据线性迭代算法设计低通原型滤波器,然后根据原理公式设计得到均匀余弦调制滤波器组,最后根据听损患者听力图将变化平缓的频率范围对应的均匀滤波器组若干通道合并为一个通道,得到对应的非均匀余弦调制滤波器组.波形实验结果显示信号经非均匀滤波器组后的时域波形与语谱图无明显失真,差异较小.语音质量实验结果显示所提出的非均匀余弦调制滤波器组的主观语音质量评估值PESQ比传统滤波器组高出约35%,语音质量指数HASQI提高约40%.

英文摘要：

To promote the performance of the traditional multichannel filter bank which leads to speech quality degradation,an efficient design method of the non-uniform cosine modulated filter bank（CMFB） based on the audiogram for digital hearing aids is proposed. First, a low-pass prototype filter is designed by the linear iterative algorithm. Secondly,the uniform CMFB is achieved on the basis of the principle formulas. Then, the adjacent channels of a uniform filter bank which have low or gradual slopes are merged according to the trend of audiogram of the hearing impaired person. Finally,the corresponding non-uniform CMFB is obtained. Simulation results show that the signal processed by the proposed filter bank is similar to the original signal in a time-domain waveform and spectrogram without significant distortion or difference. The speech quality results show that the personal evaluation of speech quality（PESQ） of non-uniform CMFB is 35% higher than that of the traditional design, and the hearing-aid speech quality index（HASQI） increases by about 40%.