Play Audio in nrf52 boards

[Yesha Patel]

How to Play Audio (.wav file) like human voice not the beep sound in nrf52832 boards?

[Hung Bui]

Hi Yesha, 

I would suggest to have a look at this case:  Play audio snippet via nRF51/52 

You can either use PWM or I2S to output the audio. 

For PWM, you would need to convert the sound to PCM format and use PWM to output the PCM data. It's is similar to what we did with the Thingy 52. I think it's a good example that you can follow.  

[Yesha Patel]

Hi Hung,

I used the PWM to output the audio, used this example https://sourceforge.net/projects/nrf52-pwm-audio/ and other audio code example with different sample audios also but it's not giving the original audio, I got lots of noise can you suggest what can be the issue?

Thanks,

Yesha.

[Yesha Patel]

Hi,

In sourceforge project I used the same sample files which is given in the code and also tried my own files as well but not getting the voice sound instead of getting crash audio sound which make lots of noise for every audio files

Thanks,

Yesha

[ovrebekk]

Hi Yesha

So running the sourceforge source code as well as the sample files still gives noisy audio?

Would you be able to make a test audio file that just plays a simple sine wave (1 kHz frequency for instance), and record the resulting sound?

Then it might be possible to understand what is going on, based on how the sine wave gets played back. 

Best regards
Torbjørn

[Yesha Patel]

Hi,

Yes, source forge source code with sample files also gives noise. I record the voice but I couldn't able to upload here, can you please guide how can I share the file

Thanks,

Yesha

[Yesha Patel]

Hi,

can you suggest how to use the DAC for playing audio from the nrf52 board, is it possible that as I have the custom board of nrf52832 with DAC connection so instead of PWM, can I use the DAC for audio playing?

Thanks,

Yesha

[Dipak]

Hi Yesha,

Thanks for the above positive reply's!

I have similar kind of problem when I send audio data to Ble I am getting lots of noise on the other side [Android phone] .

I have used SGTL5000 codec and NRF52832 MCU and I have used I2S protocol to get data from codec

Please note:

- I have set SGTL5000 codec I2S output to 16Khz. 

- In LOOPBACK sound is very crystal clear but when I send that data on  ble i am getting lots of noise. 

- I have taken dummy test where I have sent hard coded audio file to ble device and on the other   side means android side we successfully played that audio file.

Do I need to compress or decompress the data for this or can you suggest how to send data on Ble?

we are stuck here for long time!!!

After long time someone open this topic again and as per your above reply in mind born a ray of hope!!

PLEASE GUIDE US!!

Best and regards,

Dipak