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代码说明：

说明：  设计一个数字FIR低通滤波器，其技术指标如下： Wp=0.2pi Rp=0.25Db Ws=0.3pi As=50db 试写出MATLAB设计的源程序 (Design a digital FIR low-pass filter, the technical indicators are as follows: Wp = 0.2pi Rp = 0.25Db Ws = 0.3pi As = 50db Write down the design source MATLAB)