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WL1831MOD: Some WL1831MOD modules call noise

huibin chen
Intellectual 375 points
Part Number: WL1831MOD
Other Parts Discussed in Thread: WL1831

WL1831MOD, handsfree profile, use iphone6s ios 10.3.1 call, call noise, the following air log and video information:

air log->20171013.hr3.ip6s-conn-car.rar

video ->video.rar

We did the following three tests：

1.But the use of iphone7, ios 10.2.1, we did not find  call noise problems.

2.Set the FD06 command,pcm work from salve to master,we did not find  call noise problems.

3.We replaced another piece of wl1831mod module, the use of iphone6s ios 10.3.1 also did not find noise problems.

Can analyze why iphone6s ios 10.3.1 have noise, iphone7, ios 10.2.1 no noise?

Why some WL1831MOD module has a serious noise, and some WL1831MOD module no noise?

  • 0
    TI__Expert 6335 points
    Huibin,

    We have assigned your post to the relevant engineer and will get back to you.
  • 0 in reply to dale
    Intellectual 375 points

    Hi dale,

        Is there an update? Thank you!

  • 0 in reply to huibin chen
    TI__Mastermind 29250 points
    Hi Huibin,

    I do not see anything in the air logs that could be causing the noise. In addition to the air logs, can you also capture the BT FW logs for both WL1831MOD devices?

    Best regards,
    Vihang
  • 0 in reply to Vihang Parmar
    Intellectual 375 points

    Hi Vihang,

        The following tibtfwlog.rar file, please help confirm as soon as possible. Thank you!

    tibtfwlog.rar：tibtfwlog.rar

     

     

  • 0 in reply to huibin chen
    TI__Mastermind 29250 points

    Hi Huibin,

    After reviewing the ng.lgr and comparing it with the normal.lgr, I do not see any significant differences that would cause such behavior. Couple of questions regarding your tests so far.

    - Do each of the modules (the passing module and the failing one) have identical RF path and antenna?

    - I noticed that you are using the P2.136 service pack which is little old. Do you see the same behavior with the P2.142 I provided you ~1 month ago?

    - The PCM on WL183x is configured in slave mode and the WL183x is also a slave on BT connection. Have you tried switching the roles on PCM and BT connection to see if it improves the noise. P.S.: I see you have already tested this and it did not show this problem. 

    Best regards,

    Vihang

  • 0 in reply to Vihang Parmar
    Intellectual 375 points

    Hi vihang,

        Thank you for the reply.

    - Do each of the modules (the passing module and the failing one) have identical RF path and antenna?

    =>yes，We have tried to replace wl1831 with the same motherboard, no noise after replacement

    .

    - I noticed that you are using the P2.136 service pack which is little old. Do you see the same behavior with the P2.142 I provided you ~1 month ago?

    =>yes, the same behavior with the P2.142.I found that there was still noise.

    .

    - The PCM on WL183x is configured in slave mode and the WL183x is also a slave on BT connection. Have you tried switching the roles on PCM and BT connection to see if it improves the noise. P.S.: I see you have already tested this and it did not show this problem. 

    =>yes,i have tried switching the roles on pcm.As described above in my question: 2.Set the FD06 command, pcm work from salve to master, we did not find call noise problems.

     

  • 0 in reply to huibin chen
    TI__Mastermind 29250 points
    Hi Huibin,

    Thanks for the additional info. This helps me confirm that there are no other system level factors that could potentially cause this noise. That being said, I would expect the same behavior from all WL1831MOD modules. As a next step, I will loop you in with our quality experts over email and close this thread for now.

    Best regards,
    Vihang
  • 0 in reply to Vihang Parmar
    Intellectual 375 points
    Hi Vihang,
    Thanks for your support!
    I still have a question to ask?wl1831 PCM is slave, air role is master or slave.air role is master or slave,for wl1831 audio processing What is the difference?
  • 0 in reply to huibin chen
    TI__Mastermind 29250 points
    Hi Huibin,

    The BT link uses the clock of the master of the piconet. If WL183x is the slave in BT connection, that would mean the BT link will follow the clock (and thus the clock drift) of the remote master device. If the PCM interface is also in slave mode, the clock of PCM data transfer will be dependent upon the clock signal from the PCM master. So in this case, the differential clock drift of these two masters can cause PCM overrun or underrun on the WL183x (PCM and BT slave).
    Making WL183x the master of the BT connection can mitigate this.

    Best regards,
    Vihang