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TLV320AIC3254采集的数据底噪为负数

Other Parts Discussed in Thread: TLV320AIC3254

TLV320AIC3254的输入断开,采集噪声数据,发现所有的数据均为负数,并且能听到明显的噪声。想请教大家,负数的底噪是如何产生的?谢谢!