一种新的信号去噪方法及在激光信号中的应用  

New signal de-noising method and its application in laser signal

作　　者：李立[1] 彭玉华[1] 杨明强[1] 薛佩军[2] 

机构地区：[1]山东大学信息科学与工程学院,山东济南250100 [2]山东大学数学院,山东济南250100

出　　处：《红外与激光工程》2006年第3期305-309,共5页Infrared and Laser Engineering

基　　金：教育部留学启动基金资助项目(2004.176.4);山东省自然科学基金重点项目(Z2004G01)

摘　　要：小波去噪是信号去噪的主要方法之一,目前的研究主要集中于如何选取阈值使去噪达到较好的效果,其中Donoho的阈值方法应用广泛。与传统双通道小波变换相比,三通道小波变换具有很多优势。基于这一理论,结合非参数自适应估计,推导出了一种适用于三通道小波域的自适应的信号去噪方法。实验证明,与三通道小波域中基于Donoho方法的去噪相比,该方法可以更好地保护细节以及提高重建信号的信噪比,在激光超声信号处理中也表现出良好的性能。Wavelet de-noising was an important method of signal de-noising. Recently, most of research on wavelet de-noising focused on how to select the threshold. As one of main methods, Donoho was applied widely. Compared with traditional 2-band wavelet, 3-band wavelet has advantage in many aspects. Based on this theory, an adaptive signal de-noising method in 3-band wavelet domain combined with nonparametric adaptive estimation was presented. The experiment results show that in 3-band wavelet domain, the new method had better performance than Donoho method in keeping detail information and improving signal-to-noise ratio of reconstruction signal. It was also effective in laser ultrasonic signal processing.

关 键 词：非参数 自适应估计 三通道小波 信号去噪 

分 类 号：TN911.73[电子电信—通信与信息系统]