commit aeb8ce882ff59adf39db42d7be5cbb8a68a5b111
author Gustaf Ullberg <gustaf@webrtc.org> Wed May 19 14:26:31 2021 +0200
committer WebRTC LUCI CQ <webrtc-scoped@luci-project-accounts.iam.gserviceaccount.com> Wed May 19 13:37:13 2021 +0000
tree 14bb8bdf5fd592074a00798d0e862169daf8adf4
parent 402ceffff13f3ab98c404c3dcef2a2eab920ec1f

AEC3: Change adaptation speed of the matched filter after a delay is found

This change enables the use of two different adaptation speeds of the
matched filter of the delay estimator of AEC3.

One speed is used when no delay has been found, and one is used after a
reliable delay has been found. The purpose is to use a slower adaptation
speed to reduce the risk of divergence during double-talk without
slowing down the search for the initial delay.

The CL prepares for experimentation by adding field trials for
controlling the two adaptation speeds.

Bug: webrtc:12775
Change-Id: I817a1ab5ded0f78d20de45edcf04c708290173fc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/219083
Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org>
Reviewed-by: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34055}

api/audio/echo_canceller3_config.h

diff --git a/api/audio/echo_canceller3_config.h b/api/audio/echo_canceller3_config.h
index 8ffc3d9..d4a04cd 100644
--- a/api/audio/echo_canceller3_config.h
+++ b/api/audio/echo_canceller3_config.h
@@ -43,6 +43,7 @@
     size_t hysteresis_limit_blocks = 1;
     size_t fixed_capture_delay_samples = 0;
     float delay_estimate_smoothing = 0.7f;
+    float delay_estimate_smoothing_delay_found = 0.7f;
     float delay_candidate_detection_threshold = 0.2f;
     struct DelaySelectionThresholds {
       int initial;

api/audio/echo_canceller3_config_json.cc

diff --git a/api/audio/echo_canceller3_config_json.cc b/api/audio/echo_canceller3_config_json.cc
index 89256b3..39713a1 100644
--- a/api/audio/echo_canceller3_config_json.cc
+++ b/api/audio/echo_canceller3_config_json.cc
@@ -191,6 +191,8 @@
               &cfg.delay.fixed_capture_delay_samples);
     ReadParam(section, "delay_estimate_smoothing",
               &cfg.delay.delay_estimate_smoothing);
+    ReadParam(section, "delay_estimate_smoothing_delay_found",
+              &cfg.delay.delay_estimate_smoothing_delay_found);
     ReadParam(section, "delay_candidate_detection_threshold",
               &cfg.delay.delay_candidate_detection_threshold);
 
@@ -425,6 +427,8 @@
       << config.delay.fixed_capture_delay_samples << ",";
   ost << "\"delay_estimate_smoothing\": "
       << config.delay.delay_estimate_smoothing << ",";
+  ost << "\"delay_estimate_smoothing_delay_found\": "
+      << config.delay.delay_estimate_smoothing_delay_found << ",";
   ost << "\"delay_candidate_detection_threshold\": "
       << config.delay.delay_candidate_detection_threshold << ",";