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说明：  在综合描述声发射信号特点和小波殳换基本原理的基础上，结合实例介绍同时在时域 和频域具有局部分析能力的信号处理方法--小波变换在声发射信号的特征提取、时频分析和噪声去除等方面的应用。
(Described in the integrated acoustic emission signal characteristics and the basic principles of wavelet Shu-for on the basis of the introduction with an example in the time domain and frequency domain with the capacity of local analysis of wavelet transform signal processing method of acoustic emission signals in the feature extraction, time-frequency analysis and noise Removal of such applications.)