小波变换（wavelettransform，WT）是一种新的变换分析方法，它继承和发展了短时傅立叶变换局部化的思想，同时又克服了窗口大小不随频率变化等缺点，能够提供一个随频率改变的“时间-频率”窗口，是进行信号时频分析和处理的理想工具。-Wavelet transform (WT) is a new transform analysis method, which inherits and develops the idea of localized short-time Fourier transform, and overcomes the shortcomings of window size not with frequency change, can provide a change with the frequency of　 Time-frequency　window, which is an ideal tool for signal time-frequency analysis and processing.