Added support in the AEC for refined filter adaptation.
The following algorithmic functionality was added:
-Add support for an exact regressor power to be computed
which avoids the issue with the updating of the filter
sometimes being unstable.
-Lowered the fixed step size of the adaptive filter to 0.05
which significantly reduces the sensitivity of the
adaptive filter to near-end noise, nonlinearities,
doubletalk and the unmodelled echo path tail. It also
reduces the tracking speed of the adaptive filter but the
chosen value proved to give a sufficient tradeoff for the
requirements on the adaptive filter.
To allow the new functionality to be selectively applied the following was done:
-A new Config was added for selectively activating the functionality.
-Functionality was added in the audioprocessing and echocancellationimpl classes
for passing the activation of the functionality down to the AEC algorithms.
To make the code for the introduction of the functionality clean,
the following refactoring was done:
-The selection of the step size was moved to a single place.
-The constant for the step size of the adaptive filter in extended filter mode was
made local.
-The state variable storing the step-size was renamed to a more describing name.
When the new functionality is not activated, the changes
have been tested for bitexactness on Linux.
TBR=minyue@webrtc.org
BUG=webrtc:5778, webrtc:5777
Review URL: https://codereview.webrtc.org/1887003002
Cr-Commit-Position: refs/heads/master@{#12384}
diff --git a/webrtc/modules/audio_processing/include/audio_processing.h b/webrtc/modules/audio_processing/include/audio_processing.h
index ad95fad..0c93a98 100644
--- a/webrtc/modules/audio_processing/include/audio_processing.h
+++ b/webrtc/modules/audio_processing/include/audio_processing.h
@@ -80,6 +80,18 @@
bool enabled;
};
+// Enables the refined linear filter adaptation in the echo canceller.
+// This configuration only applies to EchoCancellation and not
+// EchoControlMobile. It can be set in the constructor
+// or using AudioProcessing::SetExtraOptions().
+struct RefinedAdaptiveFilter {
+ RefinedAdaptiveFilter() : enabled(false) {}
+ explicit RefinedAdaptiveFilter(bool enabled) : enabled(enabled) {}
+ static const ConfigOptionID identifier =
+ ConfigOptionID::kAecRefinedAdaptiveFilter;
+ bool enabled;
+};
+
// Enables delay-agnostic echo cancellation. This feature relies on internally
// estimated delays between the process and reverse streams, thus not relying
// on reported system delays. This configuration only applies to