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CC85XXDK-HEADSET Noise

Gary Siu
Intellectual 450 points

Other Parts Discussed in Thread: CC8531, CC8520

Hi Kjetil

I use Headset Kit, and set fixed offset Volume to 45db inconfigurator have bigger noise in receive output. Do you have solution to solve it?

 

Thanks

Gary Siu

  • 0
    Intellectual 450 points

    Hi Kjetil

    I recorded a noise and attached.3580.Noise of 45db Volume.wma

  • 0
    TI__Mastermind 21125 points

    Hi Gary, 

    Why do you want to set this high offset and what are your trying to acvhieve?
    The noisefloor will be increased by 45 dB and that is what you hear on the other end. 

    Best Regards, 
    Kjetil 

  • 0 in reply to Kjetil
    Intellectual 450 points

    Hi Kjetil

    I use for condenser Mic input and set it as high gain.

    Thanks

    Gary Siu

     

  • 0 in reply to Gary Siu
    TI__Mastermind 21125 points

    Thanks Gary, 

    You could look into adjusting the MICBIAS inside the AIC3204. 

    If you in the configurator enable  custom setup under external audio device (audio interface tab) for the slave, you will see that a new panel pop's up called audio device customization. Press "reset all" and select the configuration for INACTIVE to LOW-POWER. This will set the mic bias to whatever you feel like. You should be able to set this higher than what is used today. Cross-check with the AIC3204 datasheet:

    6.2.130 Page 1 / Register 51: MICBIAS Configuration Register
    http://www.ti.com/lit/ds/symlink/tlv320aic3204.pdf

    Hope this helps. 
    Please let me know if you have any questions with regards to this. 

    Best regards,
    Kjetil 

  • 0 in reply to Kjetil
    Intellectual 840 points

    Kjetil,

    I try Headset kit with peaker output. We facing some problem about echo when speaker talk close the speaker output, I use condensor MIC. May I check with you whether adjusting the MICBIAS can solve this issue or not? and how to do this?

    Thanks,

  • 0 in reply to MD Home
    TI__Mastermind 21125 points

    Hi MD Home, 

    Two things you can play with, one is the input volume offset in the PurePath Wireless Configurator and the other is adjusting and playing with the MICBIAS setting. What you can do is to try to lover the microphone gain and see if this help with the issue. 

    To adjust the input volume offset, please use the Volume Control panel in the cofigurator to adjust this (Fixed offset).
    To adjust the MICBIAS settings you will need to enale custom setup in the audio interface panel and then alter the MICBIAS settings in the INACTIVE to LOW-POWER settings in the Audio Device Customization panel. 

    In your final design you can look at implementing a echo cancellation algorithm. You will need to replace the AIC3204 with a CODEC with miniDSP capabilities (e.g the AIC3254 or similar) and have a small MCU to configure the codec/dsp as the memory for a echo cancellation algorithm exceedes what we have internal available in the CC85xx device. You can find more info on a echo cancellation algorithm here:
    http://e2e.ti.com/support/data_converters/audio_converters/f/64/t/70540.aspx

    Hope this helps.  
    Best regards,
    Kjetil 

  • 0 in reply to Kjetil
    Intellectual 840 points

    Hi Kjetil,

    Now we considering to replace AIC3204 with AIC3254. Per your suggestion, we need to have one more MCU(MCU + CC85XX) to configure echo cancellation algorithm in AIC3254?

    Thanks,

  • 0 in reply to MD Home
    Expert 1260 points

     

    We are working on  wireless MIC. In my design used CC8520 plus AIC3254 for Microphone side and CC8531 plus AIC3420 for speaker side. My question is how do we know when paring btweew Mic side and speaker successful. 

  • 0 in reply to MD Home
    TI__Mastermind 21125 points

    MD Home said:

    Hi Kjetil,

    Now we considering to replace AIC3204 with AIC3254. Per your suggestion, we need to have one more MCU(MCU + CC85XX) to configure echo cancellation algorithm in AIC3254?

    Thanks,

    Hi MD Home, 

    I am quite certain you do. Do not know the AIC devices in full detail, but echo cancellation is one of those things that I would assume uses more than the 1500 bytes we have internally for CODEC config. The guys over at the codec forum would know:
    http://e2e.ti.com/support/data_converters/audio_converters/default.aspx
    Best regards,
    Kjetil 
  • 0 in reply to Knighty Nimp
    TI__Mastermind 21125 points

    Knighty Nimp said:

     We are working on  wireless MIC. In my design used CC8520 plus AIC3254 for Microphone side and CC8531 plus AIC3420 for speaker side. My question is how do we know when paring btweew Mic side and speaker successful. 

    Hi Knighty, 
    First of all I am a little confused to why you selected CC8531 for the speaker side. This one have USB interface and not I2S so it can't work with any of the AIC devices. 
    In our reference designs we have a status led that can be used to show the different states (Alone, Standby, Active and Pairing). You can configure this in the PurePath Wireless Configurator in the status indication panel. 
    Hope that helps. 
    Kjetil
  • 0 in reply to Kjetil
    TI__Genius 15770 points

    HI Kjetil,

    In an old post from 2012 (above) you mentioned:

    "...echo cancellation algorithm. You will need to replace the AIC3204 with a CODEC with miniDSP capabilities (e.g the AIC3254 or similar) and have a small MCU to configure the codec/dsp as the memory for a echo cancellation algorithm exceedes what we have internal available in the CC85xx device."

    Is this recommendation still a viable solution? Can you please point me to the right TI person that currently provide support for this, if we still providing support for it?

    You can send me a direct email if you prefer mayrim.verdejo@ti.com

     

    Best Regards,

    Mayrim Verdejo

    Analog Applications

    787-368-6473

  • 0 in reply to Mayrim Verdejo
    TI__Mastermind 21125 points

    Hi Mayrim, 

    If you need echo cancellation then yes, looking towards the AIC with DSP capabilities is still the way to go. Not sure if there is a newer and more recommended device than the AIC3254 since then though, 

    Best place for support is:
    http://e2e.ti.com/support/data_converters/audio_converters/default.aspx

    Regards, 
    Kjetil