说明：  该文件给出了计算信号能量的具体方法，matlab编程计算简单，速度快，通俗易懂，适合新手，将信号的能量进行累加，便有观察检测
(This file gives the specific method of calculating the signal energy. Matlab programming is simple, fast, easy to understand, suitable for novices. It can accumulate the signal energy, and then observe and detect.)