脉冲奇异点的小波检测  

Detection of pulse singular point based on wavelet

作　　者：刘密歌[1] 郭东道[1] 李小斌[2] 

机构地区：[1]西安文理学院,西安710065 [2]西安电子科技大学,西安710071

出　　处：《电子测量技术》2009年第4期17-19,34,共4页Electronic Measurement Technology

基　　金：西安文理学院中青年专业技术人员科研资助项目(资助号:KYC200724)

摘　　要：信号的奇异点往往包含有信号比较重要的信息,对其进行检测和定位在许多实际问题中有着重要的意义。根据脉冲奇异点的特征,证明了信号的脉冲奇异点与信号小波变换的最值有关,如果适当选择小波基函数,那么信号的脉冲奇异点将对应于信号小波变换的最值点。据此提出了一个基于小波变换最值的脉冲奇异点检测方法,并给出了小波基选择条件。最后通过实验证明了该方法不仅行之有效,而且具有计算简单,定位准确的特点。The singular points in signal often take some important information, for which detection and localization have significance. According to the characteristic of singular point, it is improved that the maximum absolute value of real wavelet transform can be used to detected the pulse singularity in signal. By using the wavelet base choosed carefully, the pulse singular point in signal is exactly the maximum absolute value point of the wavelet transform. As a result, a novel method for detecting the pulse singularity in signal is developed. The results of many experiments not only show that the method can identify the sigularity from signals successfully but also have characters of simple computation and exact localization.

关 键 词：信号奇异点 小波变换 最值点 检测方法 

分 类 号：TN911.6[电子电信—通信与信息系统]