Phonic character extraction based on wavelet packet transform and wavelet threshold denoising
Chen Bai · Mechanical & Electrical Engineering Magazine · 2008
Aiming at realizing phonic character extraction at stronger noise background,wavelet packet Transform was used,and phonic character including plenty nonstationary information was extracted at phonic character frequency segments,based on the multi-resolution feature of wavelet transform,and its consistency with cochlea filtering.Fuzzy threshold function was constructed,and phonic signal with higher SNR was gained,using wavelet threshold denoising.Experimental results show that,noise is denoised and phonic character is extracted availably at a stronger noise background,using wavelet packet transform and wavelet threshold denoising.