基于改进小波阈值算法的信号去噪  

De-noising algorithm of signal based on improved wavelet threshold

作　　者：陈莉明[1] 

机构地区：[1]乐山师范学院物理与电子工程学院,四川乐山614004

出　　处：《激光杂志》2015年第3期92-95,共4页Laser Journal

基　　金：四川省教育厅项目(14ZB0251)

摘　　要：为了有效消除信号中的噪声,提出一种改进小波阈值算法的信号去噪方法。首先分析软阈值和硬阈值小波方法的优缺点,构造了一种任意阶可导的新阈值函数,然后通过调节参数的值来更好的获得阈值估计,最后在Matlab 2012平台对其去噪性能进行仿真测试。结果表明,相通于其它信号去噪方法,本文方法提高了信号的信噪比,降低了均方误差,达到了更好的消噪效果,具有更高的实际应用价值。In order to effectively eliminate the noise in the signal,a de-noising algorithm is proposed based improved wavelet threshold algorithm. Firstly,the advantages and disadvantages of wavelet soft threshold and hard threshold method are analysis,and constructs a new threshold function with an arbitrary derivative,secondly the optimal thresholds are estimated by adjusting the parameter values,finally the simulation experiment are carried out to test the de-noising performance on the Matlab 2012 platform. The results show that,compared with other signal de-noising algorithms,the proposed algorithm can improve the signal to noise ratio,and mean square error is decreased,it can obtain a better de-noising effect and has higher practical application value.

关 键 词：信号去噪 小波变换 阈值函数 最优阈值 信噪比 

分 类 号：TN911.4[电子电信—通信与信息系统]