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The audio encode demo can't cpature sound normally in DM3730 demo board！

QingboGuo
Intellectual 425 points

Hello all:

I meet a problem that the MIC doesn't work while I am debuging the encode demos.I have used the following comands to make the capture functions on:

root@dm37x-evm:~# amixer cset numid=19 5
numid=19,iface=MIXER,name='Analog Capture Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=5,step=0
: values=5,5
| dBscale-min=0.00dB,step=6.00dB,mute=0

But the mic can't work yet,or it just can capture little sound with noise.

Who can give me some suggestion?

Thanks.

BR

  • 0
    TI__Guru 65405 points

    Hi,

    If the problem is not hardware related it seem that some of the setting is not in proper range. You could decrease the step of arguments from 6.00dB to 1.00dB or lower.

    BR

    Tsvetolin Shulev

  • 0 in reply to Cvetolin Shulev-XID
    Prodigy 120 points

    Hi Tsvetolin Shulev:

    I have the same problem, I can capture the audio, but it is so low with much noise, and the headset is full of noise even I do not do anything with it.

    I try your advice, but I cann't decrease the step of arguments from 6.00dB to 1.00dB using amixer from alsa-utils, can you teach me how to do it? I am  new and thank you!

    pp Zhao

  • 0 in reply to pp zhao
    TI__Guru 65405 points

    Hi Zhao,

    I think the very possible reason for your issue is low level of gain of the microphone. I recommend you to look at the amixer linux man page and the first example at the link:

    http://linux.die.net/man/1/amixer

    The following tutorial will be useful for you if you wish to become more familiar with amixer application:

    http://www.tldp.org/HOWTO/Alsa-sound-6.html

    http://thenerdshow.com/index30e5.html

    BR

    Tsvetolin Shulev

  • 0 in reply to Cvetolin Shulev-XID
    Prodigy 70 points
    Hi,

    I am facing issue with TI EVM MIstral board with audio capture with linux kernel 2.6.39 version with alsa tools 10.24. I have tried enabling AUXL & AUXR channel for capture. I hear a lot of noise in capture samples.
    When i set the audio analog capture gain. i am not able to set the step as suggest. can any body suggest how can i set gain & step from 6.0db to 1.0db as suggest in previous replies.
    root@beagleboard:~# amixer cset name='Analog Capture Volume' 40% 20%
    numid=19,iface=MIXER,name='Analog Capture Volume'
    ; type=INTEGER,access=rw---R--,values=2,min=0,max=5,step=0
    : values=2,2
    | dBscale-min=0.00dB,step=6.00dB,mute=0
    root@beagleboard:~#

    If some body could provide the audio setting that is need to be set. it would be helpful.

    Regards,
    Deepak Reddy