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代码说明：

  基于Matlab的FIR数字滤波器，利用MATLAB信号处理工具箱中提供的基于滤波器设计方法的工具函数，采用窗设计法，用switch选择窗的类型:1、矩形窗2、汉宁窗3、汉明窗4、布拉克曼窗。(Based on the Matlab FIR digital filters, use of Matlab signal processing of the kit provides design method based on filter tool function, the window design method, choose the type of window with switch: 1, rectangular window 2, han ning window 3, han Ming window 4, braque window). )