心电信号的小波阈值去噪算法研究

An algorithm study of electrocardiogram signal de -noising by using wavelet thresholding mtheod

本文采用基于小波变换的阈值去噪方法对心电信号进行了去噪处理。给出了基小波、分解尺度、阈值的具体选择方法,在比较采用不同的基小波进行阈值处理方法的基础上,给出了采用coif4小波进行局部自适应软阈值处理的改进算法。实验结果表明,采用该算法降噪后信号的信噪比为34.019dB,将原含噪信号的信噪比提高21.879dB,去噪效果较好。

In this paper,the method of wavelet threshold de-noising was used in the electrocardiogram （ECG） signal, The methods of selecting the suitable mother wavelet,the decomposition scale and thresholds were provided, An Improved Approach to the signal dealt with level-dependent soft threshold de-noising method using coif4 wavelet was proposed after comparing different threshold de- noising methods using different mother wavelets.The experimental results showed that the signal-to-noise ratio （SNR） was improved 21.879dB and increased to 34.019dB. The de-noising effect is good.