说明：  设计了一个新的基于小波变换的信号奇异点分步检测法，该方法的特点是根据脉冲奇异点和阶跃奇异点的不同特征分两步从信号中提取奇异点
(Design a new step detection method based on wavelet transform signal singularity points, the method of characteristics is extracted from the signal in two steps according to the different characteristics of the pulse singular point and step singular point singular point)