关于数据处理的五个程序。FIR.m和IIR.m是关于设计低通滤波器。testFIRsine.m是对sine函数进行滤波验证。Window.m是对函数进行加窗。testWin.m对加窗进行验证。-About five data processing program. FIR.m and IIR.m is about designing a low-pass filter. testFIRsine.m sine function is to filter validation. Window.m i