perhaps some standard ways of doing it are around somewhere ? maybe in patents is there a chat room for audio processing ? 1. divide the signal into bands...then process each band. 2. or look for silence and expand that maybe some audio processing site discusses the techniques for this, if anyone has seen such a site thx --------------------------------- Do you Yahoo!? vote.yahoo.com - Register online to vote today! -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20041006/44bff7b5/attachment.htm