小波变换对耳蜗频率响应的模拟方法  

A Simulation Method for Frequency Response of Cochlea by Wavelet Transform

作　　者：李训诰[1] 周利辉[1] 胡刚强 

机构地区：[1]海军潜艇学院航海观通系 [2]海军92815部队

出　　处：《青岛大学学报（工程技术版）》2008年第4期31-35,共5页Journal of Qingdao University(Engineering & Technology Edition)

摘　　要：经分析发现,小波变换是对人耳蜗频率响应的近似,二者都是一组比例带宽滤波器。因此,以cmor10.5母小波为基础,构造了一系列小波组成一滤波器组,模拟了人耳频率响应。根据某类舰船单音信号参数,模拟了一含噪输入信号。以该信号为基础,对小波谱提取方法进行了研究,对于小波谱提取中涉及的带宽、分辨率等参数进行了分析,提出了改善分辨率的两种办法。最后,对某型舰船噪声进行了小波谱分析,并与其FFT谱图进行了简单的比较,对其变分辨率进行了分析,验证了小波变换比例带宽滤波器的特点。It＇s found that wavelet transform is similar to the frequency response of cochlea,since both of them are proportional bandwidth filters.Therefore,the filter bank is constructed from a series of wavelets based on cmor 1～0.5 wavelet base.The filter bank is a simulation for the frequency response of cochlea.Because of its importance in the feature information of ship-radiated noise,a signal is simulated based on some parameters of a ship-radiated noise.The wavelet spectrum was researched and the concerned bandwidth and spectrum resolution were analysed and 2 methods were brought forword to improve spectrum resolution.Furthermore,the wavelet spectrum of the ship-radiated noise was obtained,compared with FFT spectrum.The results indicated that wavelet transform is similar to proportional bandwidth filters.

关 键 词：耳蜗频率响应 比例带宽滤波器 小波谱 cmor1~0.5小波 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]