基于matlab的小波信号降噪技术

Wavelet signal denoising technique based on matlab

论述了小波变换的一般理论和小波变换在信号降噪中的应用,比较了不同小波基、阈值和分解层数下的小波降噪结果.并在matab平台上仿真实现,利用信号噪声比(SNR)和均方根误差(RMSE)这2个评价指标评价小波降噪的效果.实验结果表明,小波变换在信号降噪中能取得较好的结果.

The general theory of wavelet transform and the application of wavelet transform in signal de -noising were discussed.Different wavelet de -noising results with different wavelet bases,thresholds and decomposition level were compared .Matlab was used to carry out the simu1 ation.Signal to noise ratio （SNR） and root mean square error （RMSE ）were used to evaluate the effect of wavelet de -noising.Experimental results show that,the wavelet transform obtain better results in signal de-noising.