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请问pcm1802+dm368+dvsdk4.02采集的音频aac文件噪声严重........

Other Parts Discussed in Thread: PCM1802

环境是pcm1802+dm368+dvsdk4.02,通过./encode -a test.aac采集到的音频数据文件test.aac只有单声道,而且有严重的噪声,

pcm1802的输入时钟是11.2896M,工作模式master   24bit I2s;

44.1k也是正常输出的,示波器测试过的

附件里有采集到的aac文件,

 

请问是什么原因呢?

谢谢