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IIR数字滤波器实现

于 2022-02-12 发布 文件大小:8.17 MB
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IIR数字滤波器实现:直接每隔一个取一个采样值,这样就可以得到8k采样率的数据。但是这样明显会有问题。按照采样率变换理论,首先应该通过一个低通滤波器,滤掉[pi/2, pi]这个区间上的频率,以防止下采样造成的频率混叠。这个低通滤波器在很多书上都用FIR滤波去实现,并且可以用FIR滤波的多相结构去实现。这样滤波和下采样过程可以互换位置。即先下采样再进行多相FIR滤波。

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