live audio streaming latency NRF5340

[Jeanaros]

i am trying to develop a monitoring system for musician and low latency audio streaming is key!. preferable below 10ms  i would wat to at least stream cd quality audio 128kbps at44khz.

what product would you recommend. and what about the bleutooth LE Audio with LC3 codec. how is the latency from a source audio input to a wireless receiver?

[Karl Ylvisaker]

Hello,

preferable below 10ms  i would wat to at least stream cd quality audio 128kbps at44khz.

When you say below 10 ms here, do you mean only the BLE transfer part, or end-to-end?
Furthermore, CD quality is not 128 kbps but rather 1411 kbps, which is not feasible over a BLE link - is CD quality a requirement for your project?

what product would you recommend. and what about the bleutooth LE Audio with LC3 codec. how is the latency from a source audio input to a wireless receiver?

We recommend the nRF5340 SoC for LE Audio development.
The end-to-end latency will depend on the other parts of your system as well - such as your DAC/ADC - but a little over 30 ms should be a good estimate.

Best regards,
Karl

[Jeanaros]

1411kbps is not mandatory. However a very low latency is with still good enough audio quality for example a singer to hear her voice

For latency I was referring at the end-to-end latency. If there is a way to push the latency down to lets say 10-15ms. 

Different ADC/DCA converters might have different latencies. For this application what converter would you recommend?

Is de LC3 codec already integrated in the 5340socs. Or is this still a future firmware update?

[Karl Ylvisaker]

Jeanaros said:

However a very low latency is with still good enough audio quality for example a singer to hear her voice

The LC3 codec manages this on bitrates as low as 240 and 345 kbps.

Jeanaros said:

For latency I was referring at the end-to-end latency. If there is a way to push the latency down to lets say 10-15ms. 

Currently we have not published any performance numbers on this, so if you would like to know more about this you will need to reach out to your Regional Sales Manager with these questions, since we do not discuss future releases or roadmaps here on DevZone.
What I can say is that if you are doing transfers with 7.5 ms framesize you will also need time to capture and encode, transfer, and decode and playback, which might be a stretch for a 10-15 ms end-to-end latency requirement.

Jeanaros said:

Different ADC/DCA converters might have different latencies. For this application what converter would you recommend?

We do not have any we officially recommend, but Cirrus Logic has some great DAC/ADC's.

Jeanaros said:

Is de LC3 codec already integrated in the 5340socs. Or is this still a future firmware update?

The LC3 can run on the nRF5340 SoC, yes. The Audio SDK module for NCS is however not released yet, so it is not available right now. If you wish to know more about this release you will need to ask your Regional Sales Manager about this as well.

If you do not know who your Regional Sales Manager is, please send me a direct message with your location so that I may provide you with their contact information.

Best regards,
Karl