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用不用滤波更多应该看你项目需求,如果你项目对于ADC采集的实时性要求比较高,那么你就要注意滤波可能带来的延迟问题。如果对于实时性要求不高,那你可以加入滤波,此外你还要注意,fft和fir都比较占用资源,这个你要注意。