AM5728: McASP2 Multi serializer Audio issue

Please post what software you are using, and which version.

HI,

I am using "processor_sdk_rtos_am57xx_4_03_00_05" .

Thanks,
Janardan

Hello,
I have the most recent SDK version installed here (processor_sdk_rtos_am57xx_5_02_00_10) but I can't see definitions of these buffer formats in any demo. Do not know if I am supposed to find them in this version, so can you point me which example you're using as base?
Thanks,
Michail

HI Michel,

As far I know there is no such demo wherein PCM1864 based circular microphone board is interfaced with DSP core of Sitara processor in processor SDK RTOS release for sitara AM5728. I have K2G based demo as my reference, ported the K2G based demo onto Sitara AM5728 processor. 

If the same demo is available with AM5728 as well please let know the path where it is available .

Thanks,

Janardan

Hi,

I found that the issue what I am observing is because of improper pitch settings, I changed the pitch in audacity and tried playing it out, it works good in this scenario.

Is there any option from Sitara processor's McASP configuration end or from PCM1864 configuration to adjust the pitch?

Thanks,

Janardan

HI,

I am using K2G based demo (PCM1864 based circular microphone board interface with K2G ) as base code for my project, in K2G demo for configuring PCM1864 based Circular Microphone board (CMB) there is a library provided by TI. In my case I am doing I2C writes to configure CMB.

Can you please provide the details of what are the exact configurations(register address and values ) written to CMB from K2G board. I can not find it from demo code as there are APIs which does those configurations.

Thanks,
Janardan

Hello,
you can retrieve info about PCM186x low level functions from PDK_K2G_1_0_12. PCM186x related code can be found in pdk_k2g_1_0_12/packages/ti/addon/cmb/src and pdk_k2g_1_0_12/packages/ti/addon/aud/src.
Actual initialization probably uses only library functions (can be found in header evmK2G/include/evmc66x_audio_adc file).
Unfortunately I did not find configuration and settings about the pitch in there.

BR
Michail

Hi Michail,

Thanks for the paths.

I tried one experiment, I played a sine wave of frequency 200Hz through an android application and captured audio through 1 serializer, in this case I can see sine wave clearly on audacity.

I played sine wave of frequency 200Hz through an android application and captured audio through 3 serializers, in this case I see sine wave with some periodic interferences., what I expect to see is the clear sine wave in this case as well.

I have attached the images and raw data with the post. Please suggest me for the workaround.

Thanks,

Janardan

Audio_Data.zip

Hi Michail,

Thanks for the paths.

I tried one experiment, I played a sine wave of frequency 200Hz through an android application and captured audio through 1 serializer, in this case I can see sine wave clearly on audacity.

I played sine wave of frequency 200Hz through an android application and captured audio through 3 serializers, in this case I see sine wave with some periodic interferences., what I expect to see is the clear sine wave in this case as well.

I have attached the images and raw data with the post. Please suggest me for the workaround.

Thanks,

Janardan

0574.Audio_Data.zip

Hi Michail,

Is there any findings or clue to resolve the issue? Please provide me some inputs what can be tried to resolve this since I am feeling as if I am running out of options.

Thanks,

Janardan

Hello,
here I found a rather old thread which contains information about similar case
e2e.ti.com/.../569402
Please check if it can be of any help in your situation.
Now I am trying to check for possible issues which can prevent the K2G based demo to run properly on your Sitara board.

Michail

Hi Michail,

Thanks for the support, I could resolve the issue.

Thanks,

Janardan