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FIR滤波 波动很大

 ,这是滤波前的波形

 ,这是滤波后的波形

我是对ADC采样值进行滤波,一共是512个点,127阶;我试过256个点,63阶,也是一样的效果。这是什么情况啊?FIR滤波可以对ADC采样值进行滤波吗?