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代码说明：

说明：  matlab使用guide界面对滤波器设计，可实参数填写来获得低通，带通，高通等滤波器，这里有源代码，及guide界面，适合初学者学习参考。(Guide to filter matlab use interface design, can fill in to get real parameters low pass, band-pass, qualcomm, filter, here are the source code, and guide interface, is suitable for beginners learn reference.)