WIDI Master Bluetooth MIDI Latency Facts by CTO Jerome Dumas (March 2020)
Latency is always a hot topic when it comes to wireless MIDI. Can you tell us more about the current tests and achievement of WIDI Master?
Yes, latency is definitely important in such a product, the most important. Please note we already developed two MIDI Bluetooth products. As mentioned previously these are the Xkey Air and WIDI BUD. These products were using BLE 4 technology, and we never had complaints about latency issues. Our Xkey Air was used on stage by professional musicians.
WIDI Master uses the latest BLE 5 technology. This is even faster than BLE 4. Latency depends on the environment, and how far are the two connected devices. We are fully compliant to the MIDI over bluetooth class. Furthermore we developed internal algorithms so both devices can negotiate the lowest possible latency. Until now we were able to measure latencies as low as 3 to 4 milliseconds, depending on the connected devices. Most often we measured latencies around 5 to 6ms.
To be fully transparent, we also measured some Jitter. This means the latency was not constant, but oscillating with a few milliseconds. This could cause audible artefacts when synchronising midi instruments with a MIDI clock. Jerome is currently working on a firmware release that will reduce this jitter. This way we aim to reach a constant latency around 5 to 6ms in a good environment.
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