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DSP_Lib iir问题



请问我使用C5000库中的iircars5()函数做低通滤波器,做的椭圆滤波器,我想把过渡带做到5Hz的样子 ,但是我最好的效果只能做到200HZ左右,是我操作有问题还是理论上就达不到   采用5509A(定点)+AIC23芯片做的。