commit 09226fc8326316bf7c05df5793aab39cfe1ac660
author Gustaf Ullberg <gustaf@webrtc.org> Fri Feb 19 12:03:14 2021
committer Commit Bot <commit-bot@chromium.org> Tue Feb 23 07:06:11 2021
tree eec9a71ca32d917aba7df2df7f34c1c15ce1e4b4
parent e5caa9e2d3c7e402dd62892b1de6bd4be6f6aaf5

Disable high-pass filtering of the AEC reference

Currently the echo canceller reference signal is high-pass filtered to
avoid the need of modeling the capture-side high-pass filter as part of
the echo path.

This can lead to the lowest frequency bins of the linear filter
diverging as there is little low-frequency content available for
training. Over time the filter can output an increasing amount of
low-frequency power, which in turn affects the filter's ability to
adapt properly.

Disabling the high-pass filtering of the echo canceller reference solves
this issue, resulting in improved filter convergence.

Bug: webrtc:12265
Change-Id: Ic526a4b1b73e1808cfcd96a8cdee801b96a27671
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/208288
Reviewed-by: Per Åhgren <peah@webrtc.org>
Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33322}