nRF5340 Audio - 3 streams broadcasting

Hi Nordic Team,

Is there any way to input 3 audio streams (through I2S ) on nRF5340DK board are there any extra I2S Port available to input one more sinusoidal signal and what might be some hardware limitations for the same .

Regards
Sainath

0 Priyanka 30 days ago in reply to Nambiar

Hi Sainath,

The problem with the CPU processing time is not with fetching the data, but with encoding it. It doesn't matter if there is 2 streams from USB and 2 from I2S, it will still require about 120% CPU to encode them (~30% per channel). Also, the USB takes 20% + CPU as well. So I would say it is quite difficult.

-Priyanka
0 Nambiar 29 days ago in reply to Priyanka

So the only possible way would be to use a Softdevice and use NRF5340 as only the controller and let it receive the raw PCM encoded packet (3 streams) .
0 Priyanka 27 days ago in reply to Nambiar

I don't think that is also a good idea. That would lead to a much too high bit rate. The sole reason for having the codec there is to reduce bitrate.

-Priyanka
0 Nambiar 27 days ago in reply to Priyanka

Sorry I meant raw frames to transfer and do LC3 encoding in the Host Device .
0 Priyanka 20 days ago in reply to Nambiar

Hi,

I will discuss this with few experts and get back to you.

-Priyanka