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AGC2 lightweight noise floor estimator

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The current noise level estimator has a bug due to which the estimated
level decays to the lower bound in a few seconds when speech is observed.
Instead of fixing the current implementation, which is based on a
stationarity classifier, an alternative, lightweight, noise floor
estimator has been added and tuned for AGC2.

Tested on several AEC dumps including HW mute, music and fast talking.

Bug: webrtc:7494
Change-Id: Iae4cff9fc955a716878f830957e893cd5bc59446
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/214133
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Reviewed-by: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33733}
This commit is contained in:
Alessio Bazzica
2021-04-14 16:17:09 +02:00
committed by Commit Bot
parent 3ab7a55f6e
commit 61982a7f2d
10 changed files with 246 additions and 42 deletions
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2
modules/audio_processing/gain_controller2_unittest.cc
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@ -351,7 +351,7 @@ TEST(GainController2, UsageNoSaturationMargin) {
config.adaptive_digital.extra_saturation_margin_db = 0.f;
gain_controller2.ApplyConfig(config);
EXPECT_GT(GainAfterProcessingFile(&gain_controller2), 2.f);
EXPECT_GT(GainAfterProcessingFile(&gain_controller2), 1.9f);
}
} // namespace test