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代码说明：

  FIR数字滤波器设计，分别让满足所设计的滤波器的通带、过渡带、阻带频率特性的正弦波通过滤波器，验证滤波器性能；(FIR digital filter design, respectively, so that the design meets the filter passband, transition zone, stop-band frequency sine wave pass filter characteristic, verify filter performance )