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ADC3101 48K录音声音沙哑,求助

各位大神:

近期在调试ADC3101,发现在采样率为48K时,录音会有点沙哑的感觉,有些失真,类似电影中机器人说话。录音文件见附件

而在麦克风的接口那里,用信号发生器输出一个正弦波,录音的结果是正确的,没有失真

现在不知道原因是什么?麦克风不匹配?