压缩文件中给出了已知系统传递函数及输入信号的情况下，求解系统输出响应的四种方法，即差分方程法，卷积法，DFT法以及滤波器设计方法；此外还包含创建窗及其频率响应的matlab设计。-Known compressed file system transfer function is given and the case of the input signal, the output response of the system to solve the four methods, namely th