Have you tried this one? http://xiph.org/vorbis/doc/
Why not read the Wikipedia Vorbis page's Technical section and follow the references to technical web pages and scholarly papers describing things further. These give a lot more detail. There's also some information in Xiph's CELT and Opus blogs regarding certain techniques (e.g. Constrained Band Energy, Band Folding, Pyramidal Vector Quantization etc.).Actually, most of that's in the Specification. If you want to know about Psychoacoustic Models, the general principles are explained in numerous places with reference to other codecs, and most of these techniques are applicable to the tools available in Vorbis. You might also want to look into AoTuV source code versus libvorbis to spot differences in tuning. I think the libvorbis source code is probably pretty good documentation, then search Wikipedia, Google Scholar, and finally Google generally, to understand terms you don't recognise.
downloaded the libvorbis-aotuv_b6.03 as i have many doubts
Quote from: kumarsvinod20 on 25 January, 2013, 04:34:48 AMdownloaded the libvorbis-aotuv_b6.03 as i have many doubtsWhat do you mean?
Hi Vinod,I was just checking something out about how SILK works, and was reminded that another good resource is the PDF version of a LibreOffice or OpenOffice Impress presentation which is probably the one used by Jean-Marc Valin in his LinuxConf.au talk "Opus - The Swiss Army Knife Of Audio Codecs". (That PDF was for a gstreamer-related presentation)This contains links to relevant Wikipedia articles and illustrative graphics. You can also find the video under Presentations on the opus-codec.org website. (The specific presentation materials for that talk are linked in that page and are very similar to the gstreamer link I gave above)You'll find a good bit of detail including the LP filters coefficients that mirror the vocal tract, the way they're converted to Line Spectral Frequencies before quantization, and the combination of fixed codebooks and scalar and vector quantization, all with helpful diagrams and a fair number of equations and wikipedia links to further info, plus references that you can follow up.