Call quality and noise cancellation (regular calls, handsfree, Signal voice messages, Microsoft Teams video calls)

[yvmuell]

This was an issue on the FP2 as well

Echo in VOIP calls

Yep that’s indeed what “fixes” the issue. For FP2 we’re missing some license for getting Qualcomm’s acoustic echo cancellation actually activated. So if you load their effect libraries, AEC breaks, but if you don’t load them (as it happens in stock FP2 A9), Android falls back to a software implementation that works well enough. In Android 7 we had some patches ready actually to disable AEC somewhat cleanly, but they didn’t make it into a release anymore. See here for reference: https://gerrit-p…