BLE Audio Broadcast Mode

RE: BLE Audio Broadcast Mode

Karl Ylvisaker — Thu, 30 Jun 2022 11:43:00 GMT

[quote user="INg"]Thanks for your reply.[/quote]

No problem at all, I am happy to help! :)

[quote user="INg"]Can i confirm how many unique channels can a source be broadcasting in existing available demo?[/quote]

This will likely only be limited by your CPU resources used for processing (encoding/decording the audio streams), not the maximal number of channels or the radio air time for these channels.
The rule of thumb is that the LC3 on the nRF5340 encoding a 96 kbps stream will require roughly 30% of the CPU, while the decoding of the same stream on the receiver will require roughly 15% of the CPU.

[quote user="INg"]We would like to be board casting three or more channel of Audio tracks and was wondering do we need to implement multiple 5340BLE sources, if yes is there a way for the sink(headset) to be switching between different sources and tracks in very low latency setting [/quote]

For 3 mono audio streams as 96 kbps you will be fine with a single nrf5340. but this will require roughly 90% of the CPUs resources.
We have not implemented such switching between available streams in the reference application, but it should not take too long to implement it yourself.
For example, you can change the functionality of one of the buttons on the Audio DK in the streamctrl.c file to instead stop listening to the current stream, and to begin connecting to e new stream (either specific or random).

Best regards,
Karl

RE: BLE Audio Broadcast Mode

INg — Thu, 30 Jun 2022 00:14:34 GMT

hI Karl

Thanks for your reply.

Can i confirm how many unique channels can a source be broadcasting in existing available demo?

We would like to be board casting three or more channel of Audio tracks and was wondering do we need to implement multiple 5340BLE sources, if yes is there a way for the sink(headset) to be switching between different sources and tracks in very low latency setting

INg

RE: BLE Audio Broadcast Mode

Karl Ylvisaker — Wed, 29 Jun 2022 08:22:52 GMT

Hello INg,

[quote user=""]could i check how many channels of audio can be broadcasted and selectable on the sink (headphones)? [/quote]

I am certain that I understand what you are asking about here, could you elaborate?
In general, the Broadcast Isochronous Streams (BIS) are sent as Extended Advertisings, so they are available to any compatible receiver in the vicinity. There is therefore no hard limitation on how many broadcasted streams that could be available in the same place.
For the headset side, you could for example create a list of specific broadcasts that you would like to tune into and switch between, or you could iterate through all available broadcasts by making sure to not tune into the same broadcast twice - this will just depend on your application's logic, since there is no hard limit on how many broadcasts that can be available in the same space.

[quote user=""]I believe teh video was showing English and Spanish tracks[/quote]

Yes, the demo shown in the video is broadcasting the track in both English and Spanish, on two separate Broadcast Isochronous Channels.

Best regards,
Karl