用matlab gui设计FIR滤波器（用窗函数法和频率抽样法）

Question

现在有一个设计好的界面，用窗函数法设计fir滤波器，想要在这个的基础上加上频率抽样法设计fir滤波器的功能，以及导入音频进行滤波的功能

Answer 1

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