• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 98 subscribers
  • Views 882 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TMDX5535EZDSP: Audio Pre-Processing: Change input audio rate from 16Khz to 8Khz for 4 Mic setup

Abhinandan BR
Intellectual 945 points

Part Number: TMDX5535EZDSP

Hi,

I am working on audio pre-processing library using PCM1864 Mic Array Setup. By default the sampling rate is 16Khz. I want to change it to 8Khz rate so that my processed output is also at 8Khz rate.

What are steps to be followed to do the same? I need to change in AIC_init codec and PCM_init to 8Khz. Other than this where all changes have to be done in the project please point out the steps.

  • 0
    TI__Guru 65405 points
    Hi Abhinandan,

    I've forwarded this to the c55x software experts. Their feedback should be posted here.

    BR
    Tsvetolin Shulev
  • 0
    TI__Mastermind 30365 points
    Abhinandan,

    There are no steps outlining the specific changes since the demo was built for 16k. You can grep the code to see where the 16k sampling is set to make the change. The MSS and DRC will also need to be adjusted accordingly.
    The coefficients that are included in the source by default are for 16k , so they will have to be regenerated using the bftool that I mentioned to you in another thread.

    Please see the PCM1864 datasheet for the sampling rate change. There is a table in the documentation that explains the various setting values you can send the codec during initialization in order to have the desired sampling rate.

    Lali