35b72fbceb
- New option for computing variance that is more adaptive with lower complexity. - Fixed related off-by-one errors. - Added intelligibility unittests. - Do not enhance if experiencing variance underflow. R=andrew@webrtc.org, henrik.lundin@webrtc.org Review URL: https://codereview.webrtc.org/1207353002 . Cr-Commit-Position: refs/heads/master@{#9567}