一种改进阈值法小波去噪的信号包络分析方法研究

根据小波域阅值滤波的降噪特性,把改进的阈值函数方法和平移不变小波变换相结合,提出一种改进阈值法的小波去噪方法.所提方法和包络分析相结合,能够较好地解决由于随机噪声干扰而造成提取的包络信号轮廓信息粗糙的问题,改善包络提取精度.实现方法是先将改进阈值法的小波去噪方法作为包络分析的前置处理手段,再对信号进行包络提取和包络细化谱分析,获得突变特征频率.仿真结果表明,该方法可以有效的抑制噪声,能够较准确地提取信号包络和突变特征频率.

Study on a Signal Envelopment Analysis Method Based on Threshold Method of Improved Wavelet Denoising

According to the noise reduction feature of wavelet threshold filtering,improved threshold function method and translation invariance wavelet transform were combined.So a wavelet denoising method of improved threshold was used.The combination of proposed method and envelopment analysis,could be better able to solve the problem of extracting the envelope signal that has rough outline caused by random noise interference,and could improve the accuracy of envelope extraction.The implementation was that,first,th...