说明：  小波变换（wavelet transform，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 (wavelet transform WT) is a new analysis method, it inherited and developed the short-time Fu Liye transform the idea of localization, but also overcomes the disadvantages of window size does not change with frequency, can provide a time - frequency with the frequency change of the window, is an ideal tool for time-frequency analysis and processing the signal.)