基于拉格朗日插值的电子耳蜗分数延迟和参数失配分析  

Fractional delay based on Lagrange interpolation and analysis of parameter mismatch in cochlear implant

作　　者：张春晓[1] 陈又圣[1] 黄鸿展 ZHANG Chunxiao;CHEN Yousheng;HUANG Hongzhan(Shenzhen Institute of Information Technology,Shenzhen 518000,China)

机构地区：[1]深圳信息职业技术学院,广东深圳518000

出　　处：《中国医学物理学杂志》2021年第4期468-471,共4页Chinese Journal of Medical Physics

基　　金：广东省普通高校特色创新类项目(2019GKTSCX094);广东省科技创新战略专项资金“攀登计划”(pdjh2021b0908)。

摘　　要：波束形成方法是电子耳蜗前端语音增强的重要方法之一,该方法的主要参数是增益系数和延迟参数。电子耳蜗的尺寸小,传统的波束形成方法在具体应用中会出现分数延迟的问题。本文采用拉格朗日多项式的插值方法实现电子耳蜗的分数延迟参数,通过相邻点的数值进行加权形成分数延迟的信号序列。仿真分析表明,拉格朗日多项式插值的分数延迟方法可实现低频段的幅频响应和相频响应的高度吻合,契合电子耳蜗频带特征,可实现电子耳蜗所在频段分数延迟的低误差和低计算复杂度。Beamforming is one of the most important methods for speech enhancement at cochlear implant front end,and the main parameters of this method include gain coefficient and delay parameter.Due to the small size of cochlear implant,there will be the problem of fractional delay in the traditional beamforming method.Herein Lagrange polynomial interpolation is used for realizing the fractional delay parameters of cochlear implant,and the fractional delay signal sequence is formed by weighting the values of adjacent points.The simulation results show that the fractional delay method based on Lagrange polynomial interpolation can not only achieve the high coincidence of amplitude frequency response and phase frequency response in low-frequency band,which is consistent with the characteristics of cochlear implant frequency band,but also realize the low error and low computational complexity of fractional delay in cochlear implant frequency band.

关 键 词：拉格朗日插值 电子耳蜗 分数延迟 参数失配 

分 类 号：TH776[机械工程—仪器科学与技术] R318[机械工程—精密仪器及机械]