The reverberation echo is quite serious on my application (mobile device), although I've removed acoustic echo successfully by using Speex AEC. Is there any one knows how to handle reverberation echo significantly? Speex does provide dereverb option. However, it's empty function. Dennis -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20080116/b295565b/attachment.html