• State TI Thinks Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 419 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TLV320AIC3107: Audio Codec Noise Issue while recording the audio

Jilu John
Prodigy 80 points
Part Number: TLV320AIC3107
We are using the audio codec TLV320AIC3107IRSB in our design and facing some noise issues while recording the audio.  
Our observations are as follows.
1) When we played a downloaded file (non recorded) we are getting an rms
    voltage of 320mV and was loud enough
 
2) When we try to record by speaking closer to the mic we can hear our sound
    loud enough (less noise) and getting an rms voltage of around 320mV and
    when we try to record at a 50 cm distance from the mic we are getting more
    noise and recorded volume was low.
 
Could you help us to rectify this noise issue.

  • 0
    TI__Guru 62035 points

    Hello,

    Could you share a little more information about your register settings and/or processing blocks being used?  These devices have a lot of configuration settings and it's hard to determine the expected operation without understanding how it's being configured.

  • 0 in reply to Collin Wells
    Prodigy 80 points

    Hi Collin,

    Please find the alsamixer settings we made additionally for recording and playback:

    1) PCM (LDAC_VOL, RDAC_VOL ) gain as maximum (0dB)

    2) HP DAC (DACL1_2_HPLOUT_VOL, DACR1_2_HPROUT_VOL ) gain as maximum (0dB)
    3) LINE1R_2_RADC_CTRL & LINE1L_2_RADC_CTRL as differential.

    Please find the steps we followed for recording:

    i2cset -f -y 2 0x18 0x1a 0x80
    i2cset -f -y 2 0x18 0x1d 0x80
    i2cset -f -y 2 0x18 0x0c 0xa0
    i2cset -f -y 2 0x18 0x6b 0xc0
    i2cset -f -y 2 0x18 0x19 0x40
    arecord -c 2 -d 10 -D hw:0,0 -r 8000 -f S16_LE test.wav

  • 0 in reply to Jilu John
    TI__Mastermind 22950 points

    Hello Jilu,

    Can you please share the following:

    - I2C transactions

    - Full register dump

    - Schematic

    - Scope shots of BCLK, WCLK DIN/DOUT

    There are several reasons that may cause unwanted noise in the recording path including incorrect PLL configuration, grounding issues, incorrect device configuration and incorrect ASI bus configuration. Providing the above requested information will help narrow down some possible causes. 

    Regards,

    Aaron

  • 0 in reply to Aaron Estrada
    Prodigy 80 points

    Hi Aaron,

    Please find the attached required documents.Audio Issue_Required Docs.zip

  • 0 in reply to Jilu John
    TI__Mastermind 22950 points

    Hello Jilu,

    Thanks for providing the requested info. Another question I have is what is the MCLK frequency being provided to the device? Based on the PLL configuration I would expect it to be 2.048MHz.

    It would also be good to see WCLK and BCLK on the same capture to make sure they are aligned correctly. 

    Regards,

    Aaron

  • 0 in reply to Aaron Estrada
    Prodigy 80 points

    Hi Aaron,

    i am attaching the combined image of BCLK and WCLK.

    And regarding the MCLK, we are not providing it externally, its generated internally

  • 0 in reply to Jilu John
    TI__Mastermind 22950 points

    Hello Jilu,

    I look at the register configuration again and see that you are using BCLK as the PLL input clock. Doing so will not generate the proper Fs with BCLK = 255kHz as shown above. The minimum PLL input clock frequency is 512kHz.  Since the PLL is expecting an input clock frequency of 2.048MHz, can you please provide a BCLK of 2.048MHz and see if this noise issue goes away?


    Regards,

    Aaron