Multiple BLE audio source(Mic) with single BLE audio sink

[chethan26]

Hello,

we are looking to develop multiple BLE audio source which sends the mic data to the receiver and the receiver receive the audio data from multiple transmitters over BLE, output through I2S.

Can anybody please help us how to implement with NRF53.

Similar Thread:

devzone.nordicsemi.com/.../multiple-ble-audio-source-devices-outputting-to-a-ble-audio-sink-device

Best Regards,

Chethan kumar

[Hung Bui]

Hi Chethan, 

Please give us more information about the application and the technology you plan to use: 

- Is it half duplex ? Meaning the receiver only receive and won't send any data back ? 

- What's the audio quality requirement  ? 

- How many stream are you planning to do ? 

- Are you thinking of Bluetooth LE Audio or you are looking at normal Bluetooth LE ? 

If you are doing normal BLE , you can think of what you are doing is simply sending compressed audio packets from multiple link and then uncompress and play them via I2S. 

[chethan26]

Hi Hung Bui,

Thank you for your response.

- Yes, it is half duplex. one receiver should receive audio data from multiple(4) transmitter. 

- This is for conference application and used like lapel mic.

- 4 transmitter 1 receiver.

Thinking of Bluetooth LE audio to get good audio quality but normal Bluetooth LE also fine. 

Can we use NRF53_Audio example to achieve this concept?

If yes, in CIS mode one gateway(Tx) and 2 headset(Rx). can we interchange to 2 Tx and 1 Rx?

Best Regards,

Chethan kumar

[ovrebekk]

Hi Chethan 

Hung gave this case to me since I also helped you with the other one. 

Technically this should be possible, but I am not sure how easy it is to modify the existing LE Audio example to do this. I have asked the audio developers for some input on this, and will try to get back to you in a couple of days. 

Best regards
Torbjørn

[chethan26]

Hi Torbjørn,

Thank you.

I will be waiting for your suggestion.

Best Regards,

Chethan kumar

[ovrebekk]

Hi Chethan

There are some updates coming in the nRF Connect SDK to support bi-directional audio, and you can take a look at it already by checking out the following two PR's:
https://github.com/nrfconnect/sdk-nrf/pull/8915
https://github.com/nrfconnect/sdk-nrf/pull/9003

Please note that multiple receive channels will not be supported by these enhancements. 

Best regards
Torbjørn

[chethan26]

Hi Torbjørn,

This firmware is having pairing issue, still bi-directional audio not supported in SDK 2.1.2.

Best Regards,

Chethan kumar

[ovrebekk]

Hi Chethan

Bi-directional audio should be included in the NCS 2.2.0 release, which should be out early December. 

Best regards
Torbjørn

[chethan26]

Hi Torbjørn,

Thank you for your information.

For us uni-direction(Audio Stream from Headset to Gateway) is enough. Only audio streaming direction need to be change.

Can you please help us what are the changes required in the le_audio_cis_headset.c and le_audio_cis_gateway.c file?

Best Regards,

Chethan kumar