Recommend best sample app to stream audio data between two nRF52832 (nRF52-DK boards)

RE: Recommend best sample app to stream audio data between two nRF52832 (nRF52-DK boards)

Turbo J — Sat, 24 Feb 2018 13:15:27 GMT

With the abundance of other 2.4GHz technologies (WLAN etc) present, lost bluetooth packes are expected in all but the rares cases. Urban environment is notoriously bad.

RE: Recommend best sample app to stream audio data between two nRF52832 (nRF52-DK boards)

Daniel Wang — Sat, 24 Feb 2018 12:38:47 GMT

Nordic have several reference design with audio/voice over BLE (Thingy:52 and Smart Remote 3). Smart Remote 3/Thingy does audio compression support using OPUS, BroadVoice and ADPCM. And since you control both sides of the link(nrf52832 both sides), you can get the maximum performance. BLE today have minimum latency at 7.5ms, and all packets must be delivered(you can't skip/ignore packets). If this is a problem(doesen't have to be), you could go away from BLE, and go for one of the Nordic proprietary protocols(Enhanced ShockBurst), so you dont have this limit(1ms latency, and you can skip packets).

RE: Recommend best sample app to stream audio data between two nRF52832 (nRF52-DK boards)

Matt — Sat, 24 Feb 2018 12:28:26 GMT

I've seen someone mentioned "lowfi" voice quality in this forum before. You need to consult with Nordic tech support to see if that's do-a-ble in your particular application.

RE: Recommend best sample app to stream audio data between two nRF52832 (nRF52-DK boards)

ericalbers — Sat, 24 Feb 2018 12:08:01 GMT

I have audio data, but 'low' quality, i.e. about 300k bits per second, but its continuous, is the nrf52832 the right chip for this? Can the 'connection interval' be set to be VERY long....since its low quality audio data, we would just ignore lost packets in a more noisy environment.

RE: Recommend best sample app to stream audio data between two nRF52832 (nRF52-DK boards)

Matt — Sat, 24 Feb 2018 11:49:05 GMT

Some throughput info from this article:

devzone.nordicsemi.com/.../throughput-and-long-range-demo

RE: Recommend best sample app to stream audio data between two nRF52832 (nRF52-DK boards)

Turbo J — Sat, 24 Feb 2018 10:39:08 GMT

Check available bit rates in the softdevice specs, bluetooth low energy is usually too slow to transmit hifi audio data.