Investigating the Performance of Gammatone Filters and Their Applicability to Design Cochlear Implant Processing System

Designs Pub Date : 2024-02-02 DOI:10.3390/designs8010016
R. Islam, Mohammed Tarique
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Abstract

Commercially available cochlear implants are designed to aid profoundly deaf people in understanding speech and environmental sounds. A typical cochlear implant uses a bank of bandpass filters to decompose an audio signal into a set of dynamic signals. These filters’ critical center frequencies f0 imitate the human cochlea’s vibration patterns caused by audio signals. Gammatone filters (GTFs), with two unique characteristics: (a) an appropriate “pseudo resonant” frequency transfer function, mimicking the human cochlea, and (b) realizing efficient hardware implementation, could demonstrate them as unique candidates for cochlear implant design. Although GTFs have recently attracted considerable attention from researchers, a comprehensive exposition of GTFs is still absent in the literature. This paper starts by enumerating the impulse response of GTFs. Then, the magnitude spectrum, |H(f)|, and bandwidth, more specifically, the equivalent rectangular bandwidth (ERB) of GTFs, are derived. The simulation results suggested that optimally chosen filter parameters, e.g., critical center frequencies,f0; temporal decay parameter, b; and order of the filter, n, can minimize the interference of the filter bank frequencies and very likely model the filter bandwidth (ERB), independent of f0b. Finally, these optimized filters are applied to delineate a filter bank for a cochlear implant design based on the Clarion processor model.
研究伽马通滤波器的性能及其在设计人工耳蜗处理系统中的适用性
市面上销售的人工耳蜗旨在帮助重度耳聋患者理解语言和环境声音。典型的人工耳蜗使用一组带通滤波器将音频信号分解成一组动态信号。这些滤波器的临界中心频率 f0 模仿人类耳蜗由音频信号引起的振动模式。伽马通滤波器(GTF)具有两个独特的特征:(a)模仿人类耳蜗的适当的 "伪共振 "频率传递函数;(b)实现高效的硬件实施,因此可以证明它们是人工耳蜗设计的独特候选者。尽管 GTF 最近引起了研究人员的极大关注,但文献中仍缺乏对 GTF 的全面阐述。本文首先列举了 GTF 的脉冲响应。然后,推导出 GTF 的幅度谱、H(f)| 和带宽,更具体地说,是等效矩形带宽(ERB)。仿真结果表明,优化选择的滤波器参数,如临界中心频率 f0、时间衰减参数 b 和滤波器阶数 n,可以最大限度地减少滤波器组频率的干扰,并很有可能模拟滤波器带宽(ERB),而与 f0b 无关。最后,这些经过优化的滤波器被应用于基于 Clarion 处理器模型的人工耳蜗设计的滤波器组。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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