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AM335X MAC IN record file and play have noise

Other Parts Discussed in Thread: AM3352

Hi,All
  My Platform AM3352, Audio IC is TLV320AIC3106EVM
  Audio format set IIS Mode
  Play Audio is OK
  MAC IN(microphone input) record command:
  arecord -t wav -c 2 -f S16_LE -r 44100 -d 10 record_auio.wav
  Then play the audio file:
  aplay record_auio.wav
  I can hear the audio content but there are a lot of noise!
  I don't know whether there are other configuration?