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The estimation on how well the linear filter in the AEC3 is performing is done through an estimation of the ERLE. That estimation is then used for knowing how much the suppressor needs to react in order to cancel all the echoes. In the current code, the ERLE is quite conservative during farend inactivity and it is common that it goes to a minimum value during those periods. Under highly varying conditions, that is probably the right approach. However, in other scenarios where conditions does not change that fast there is a loss in transparency that could be avoided by means of a different ERLE estimation. In the current CL, the ERLE estimation has been changed in the following way: - During farend activity the ERLE is estimated through a 1st order AR smoother. This smoother goes faster toward lower ERLE values than to larger ones in order to avoid overestimation of this value. Furthermore, during the beginning of the farend burst, an estimation of the ERLE is done that aim to represent the performance of the linear filter during onsets. Under highly variant environments, those quantities, the ERLE during onsets and the one computed during the whole farend duration, would differ a lot. If the environment is more stationary, those quantities would be much more similar. - During nearend activity the ERLE estimation is decreased toward a value of the ERLE during onsets. Bug: webrtc:9040 Change-Id: Ieab86370a4333d2d0cd7041047d29651de4f6827 Reviewed-on: https://webrtc-review.googlesource.com/62342 Commit-Queue: Jesus de Vicente Pena <devicentepena@webrtc.org> Reviewed-by: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22568}
WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.
Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.
The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others.
Development
See http://www.webrtc.org/native-code/development for instructions on how to get started developing with the native code.
Authoritative list of directories that contain the native API header files.
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- Official web site: http://www.webrtc.org
- Master source code repo: https://webrtc.googlesource.com/src
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