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Sometimes MIC Recording noise on i.MX6Q Sabre-AI board

Question asked by jianhua xu on Mar 5, 2015
Latest reply on Mar 12, 2015 by gusarambula
Branched to a new discussion

Hi Community,

 

  We meet a problem which is just the only one bug not fixed in the customer project and this bug blocks the MP plan.

Based board: i.MX6Q Sabre-AI

                OS: Android_jb4.3_1.0.0

  Audio Codec: Realtek ALC3261

  After power on, do MIC recording with Android default recording APK and play the recording file, sometimes, there is noise.

  the symptom is strange. If it is ok after power on this time, it will be always ok all the time before power down; if it is noise after power on this time, it will be always NG all the time before power down.

  if use commond tinycap and tinyplay, the symptom will also happen.

 

  Realtek FAE has already checked. If the MIC audio bypass to analog output, there is no noise. if the MIC audio is recorded through i.MX6Q, the symptom will happen.

  The below picture is part of diagram. If any more needed, please let me know, i will paste more.

  Could you give me some advices , we have already checked this issue for 1 month

  Audio1.jpgaudio2..jpg

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