Bluetooth mic input creates garbled sound on the iOS client

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Joined: 02 Mar 2019, 03:20

Bluetooth mic input creates garbled sound on the iOS client

Post by retravision »

Hello forum!
I'm looking for advice on how to resolve this issue arising from bluetooth earbuds/earphones connected to iPhone. When I speak into the bluetooth mic, the output at any receiving phone is garbled (digital artefacts).

iOS: 12.1.4
Mumble: 1.3.1

By borrowing, I have found that some bluetooth devices don't cause this problem (they work fine on Mumble), but these are too expensive for me to own permanently. These are:
- Bose
- Jabra Stealth

All other cheap/generic bt earbuds/earphones cause the problem.

Also, I've found that replaying the recorded messages directly off the Mumble server is fine (no garble/artefacts)! This implies that the corruption seems to be happening on the receiving parts of the end-to-end transmission.

- Has anyone found a root cause to this pattern, e.g. the cost of chipset in the bt device, or hard-coded bluetooth parameter in the device?
- Is there any workaround that preserves full-duplex messaging?


P.s. Here is a similar old post, on the same topic.

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