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关于TLV320ADC3101的带通滤波

你好:

     我正在使用TLV320ADC3101这颗芯片,通过设置coefficient,设置高通和低通滤波。然后分析录音文件,发现信号和噪声都整体下降了,并没有达到预期的 滤去高频率和低频率的噪声,请问这是什么原因,还是要设置其他的地方?