Page 136 - 《应用声学》2022年第4期

第 41 卷 第 4 期 Vol. 41, No. 4
2022 年 7 月 Journal of Applied Acoustics July, 2022

⋄ 研究报告 ⋄

面向中频段听阈突变听力损失的

非均匀滤波器组设计 ∗

张勇成 陈华伟 †

(南京航空航天大学电子信息工程学院 南京 211106)

摘要：滤波器组是气传导助听器进行听觉补偿的重要功能模块。针对现有固定滤波器组对中频段听阈突变听
损听力图的匹配效果欠佳问题，该文提出一种 13 子带非均匀滤波器组设计方案。不同于现有固定滤波器组，
该文首先将全频段进行等比例 3 段划分，便于滤波器组在相应频段内进行听损补偿；然后在低频和高频段子带
具有较高分布密度的前提下，适当增加中频段子带的分布密度，以提升中频段听损补偿效果；最后根据听力图
的倍频特征点确定子带的中心频率，从而得到适配听力图的子带排布方案。此外，将频率响应掩蔽技术和奈
奎斯特滤波器用于各子带的产生，进一步降低了滤波器组群延时和硬件复杂度。仿真分析表明，相比于现有
16 子带非均匀滤波器组，该文滤波器组对各类型中频段听阈突变听损听力图的平均匹配性能提升了 48.4%，
群延时降低了 11.7%。因此，所设计滤波器组在面向补偿中频段听阈突变听损的气传导助听器中具有一定
应用价值。
关键词：非均匀滤波器组；频率响应掩蔽技术；听力图匹配；气传导助听器
中图法分类号: TN912.3 文献标识码: A 文章编号: 1000-310X(2022)04-0634-12
DOI: 10.11684/j.issn.1000-310X.2022.04.016

Design of non-uniform filter bank targeting hearing loss with auditory thresholds
changing sharply in middle frequencies

ZHANG Yongcheng CHEN Huawei

(College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China)

Abstract: The filter bank is an important functional module for the auditory compensation of air-conduction
hearing aids. For the existing fixed filter bank, the matching performance is not good enough for audiograms
whose auditory thresholds change sharply in middle frequencies. To address this problem, a 13-band non-
uniform filter bank is proposed in this paper. Different from the existing fixed filter bank, the whole frequency
range is divided into three equal regions firstly, which facilitates the filter bank to compensate for the hearing
loss in the corresponding region. Then, to enhance the compensation effect for the hearing loss in middle fre-
quencies, we appropriately increase the resolution of subbands of middle region while keeping higher resolution
of subbands of low and high regions. Finally, the center frequency of each subband is determined according
to the octave of a standard audiogram and a subband distribution that is suitable for audiogram matching is
obtained. In addition, subbands of the filter bank are produced with the help of frequency response masking

2021-07-08 收稿; 2021-10-11 定稿
国家自然科学基金项目 (61971219)
∗
作者简介: 张勇成 (1996– ), 男, 江西抚州人, 硕士研究生, 研究方向: 滤波器组设计。
通信作者 E-mail: hwchen@nuaa.edu.cn
†