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tlv320aic23b linein 输入,输入调整输入增益的时候产生的噪声

设备使用tlv320aic23b codec ,当通过软件调节linein输入增益的时候发现,当输入增益调到0dB或者大于0dB的时候会突然产生一个噪声,而在输入增益小于0dB的时候没有该噪声,想问一下是什么原因?