Hi, all can anyone enlighten me what's the mathematical formula that are used to compute the vorbis noise curve(convolution, filter, spectrum energy, etc)? I looked at the new speex code, it is really hard to understand the compute_curve function(because of some other functions that it calls). And it looks to me it is not Psychoacoustic model II, which is well documented. I checked the vorbis documentation and the paper: "Improved Noise Weighting in CELP Coding of Speech - Applying the Vorbis Psychoacoustic Model To Speex", but none of them memtions about it. Thanks so much Jim -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20061122/1ca17f55/attachment.html