小波变换对耳蜗频率响应的模拟方法

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。

A Simulation Method for Frequency Response of Cochlea by Wavelet Transform

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.