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Original question:

PCM2902: too much distortion and noise in the input capture

PCM2902: Development Issues with PCM2902

Ricardo Dalessandro de Almeida
Prodigy 70 points
Part Number: PCM2902

I'm a hardware developer. I'm having trouble developing a capture device with pcm2902. The client when installing the windows drive by default configures as MIC input as Mono. Is there any way to modify the driver so that the windows automatically configure as MIC input 2 channel 44100 stereo?
Thanks in advance for your help.

  • 0
    TI__Guru 57800 points

    Hi, Ricardo,

    I have tried with the EVM in different computers in my lab and all of them sets the recording device in 2 channel 44100 stereo mode by default. It is possible that your customer is using a specific driver. From the device point of view, there is no way to setup internally the default mode which would be recognized by Windows or any OS.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Prodigy 70 points

    Hi Diego, thanks for the reply. In all Computers that I installed and already tested in win7, 8, 8.1 and 10. They all installed the drive and by default a windows drive "USB CODEC" already configured for 1 channel. The user to use has to modify manual, which I wanted to do via software or by drive. There is no way?

  • 0 in reply to Ricardo Dalessandro de Almeida
    TI__Guru 57800 points

    Hi, Ricardo,

    Thanks for the feedback. Unfortunately, there is no way to configure the default recording mode for the PCM2902C on the device itself. I am not sure if somehow this can be implemented in Windows.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Prodigy 70 points

    Hi Diego, thanks for the reply. I've tried manually editing the drive .inf, but I'm not successful. I know it's in this drive .inf file key "OEMSettingsOverride.AddReg":

    Key original:

    [OEMSettingsOverride.AddReg]
    HKR, "EP \\ 0",% PKEY_AudioEndpoint_Association% ,,% KSNODETYPE_SPEAKER%
    HKR, "EP \\ 0",% PKEY_AudioEngine_OEMFormat%,% REG_BINARY%,
    41,00,76,74,01,00,00,00,fe,ff,02,00,44,ac,00,00,10,b1,02,00,04,00,10,00,16,00,10,00,03,00,00,00,01,00,00,00,00,00,10,00,80,00,00,aa,00,38,9b,71

  • 0 in reply to Diego Melendez
    Prodigy 70 points

    I modified the key OEMSettingsOverride.AddReg, changing according to this table the PCM2902 datasheet: