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PCM2901: There is noise in USB codec when entering the system

user6514855
Prodigy 10 points
Part Number: PCM2901

Dear Sir：

       When I tested the function of PCM2901E, I found that there was a noise when I entered the system or entered the desktop with password.I tested Ubuntu 16.04/18.04/20.04 and found this noise,but it was not found in WIN10. After entering the OS, the audio function is OK.

       Test platform: Intel APL N3350 + PCM2901E

       This is a USB waveform that does not play audio files after entering the system：

        

        This is the USB waveform in case of noise or playing audio files or hot plug codec chips while the system is running:

        

       So the source of the noise is the data on the USB waveform. But for a voice data, why does it become noise after codec conversion? Is there any way to avoid this noise?

       Looking forward to your help,thanks.

       Long.zhang

       

       

  • 0
    TI__Guru 62085 points

    Hello,

    Could you try attaching the images or audio files again?  They did not make it through and it's a little hard to understand the issue.  The PCM2901 is not the USB host and is a target device that enumerates as a UAC1.0.  If the host is requesting USB data from the device then it will put out microphone data.