tree da4802170191e7ae2778b02756542ffa7b99caea
parent bcdf8f09214a414a76f8549612834b576c8214c6
author Alessio Bazzica <alessiob@webrtc.org> 1618409829 +0200
committer Commit Bot <commit-bot@chromium.org> 1618950478 +0000

[cherry pick] AGC2 lightweight noise floor estimator

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.

(cherry picked from commit 61982a7f2d77a03000983b563e840b16a2211e02)
NOTRY=true

Bug: chromium:1199259,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-Original-Commit-Position: refs/heads/master@{#33733}
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/215781
Reviewed-by: Minyue Li <minyue@webrtc.org>
Cr-Commit-Position: refs/branch-heads/4472@{#6}
Cr-Branched-From: 3e0c60ba4ef28a9f26fe991e5eec3150402c7dd3-refs/heads/master@{#33644}