说明：  小波变换是一种信号的时间—尺度分析方法，它具有多分辨率分析的 特点，而且在时频两域都具有表征信号局部特征的能力。由于其在信号处 理领域表现出的优异性能，目前在生物医学领域，广泛应用于信号检测、 特征提取、图像处理、信号压缩等方面。
(Wavelet transform is a signal of the time- scale analysis method, it has the characteristics of multi-resolution analysis, but also in time and frequency domain have the ability to characterize local signal characteristics. Signal processing because of its excellent performance shown by the current in the biomedical field, is widely used in signal detection, feature extraction, image processing, signal compression and so on.)