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}
diff --git a/modules/audio_processing/audio_processing_unittest.cc b/modules/audio_processing/audio_processing_unittest.cc
index e3aedf6..4c879c7 100644
--- a/modules/audio_processing/audio_processing_unittest.cc
+++ b/modules/audio_processing/audio_processing_unittest.cc
@@ -2216,7 +2216,7 @@
std::make_tuple(32000, 44100, 16000, 44100, 19, 15),
std::make_tuple(32000, 32000, 48000, 32000, 40, 35),
std::make_tuple(32000, 32000, 32000, 32000, 0, 0),
- std::make_tuple(32000, 32000, 16000, 32000, 40, 20),
+ std::make_tuple(32000, 32000, 16000, 32000, 39, 20),
std::make_tuple(32000, 16000, 48000, 16000, 25, 20),
std::make_tuple(32000, 16000, 32000, 16000, 25, 20),
std::make_tuple(32000, 16000, 16000, 16000, 25, 0),
@@ -2231,7 +2231,7 @@
std::make_tuple(16000, 32000, 32000, 32000, 25, 0),
std::make_tuple(16000, 32000, 16000, 32000, 25, 20),
std::make_tuple(16000, 16000, 48000, 16000, 39, 20),
- std::make_tuple(16000, 16000, 32000, 16000, 40, 20),
+ std::make_tuple(16000, 16000, 32000, 16000, 39, 20),
std::make_tuple(16000, 16000, 16000, 16000, 0, 0)));
#elif defined(WEBRTC_AUDIOPROC_FIXED_PROFILE)