Aleksandar Dovnikovic
2001-Jun-27 13:14 UTC
[vorbis] Wavelet audio codec by Adapted Wave Tech.
Following a post on vqf.com forum, I found out that some company called Adapted Wave Technology is ready to release its audio codec based on wavelets. They say that this wavelet-based codec is superior to MDCT codecs by 30-50%. One sentence caught my attention: "Adapted Wave Technologies holds exclusive patent rights for applying wavelet packets to audio applications." - sounds like a broad patent, doesn't it? :-)) There's also a PDF document describing this technology, get it here: http://www.adaptedwave.com/AWT_Technology_White_Paper.pdf For more info, check their website: http://www.adaptedwave.com I know that there is a question about wavelets in Ogg Vorbis FAQ, and it says that wavelets are good mostly for transient signals... Comments? --- Aleksandar @ Vorbis Xtreme | http://solair.eunet.yu/~aldov Ogg Vorbis is the free, open source alternative to MP3 --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'vorbis-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
> One sentence caught my attention: "Adapted Wave Technologies holds exclusive > patent rights for applying wavelet packets to audio applications." - sounds > like a broad patent, doesn't it? :-))It's probably not as broad as it sounds. Wavelets are a common tool in signal processing, and likely ahve been used in many ways on audio in the due course of science. They may have some new trick, but.. uh.. from what I've read and discussed with others, the MDCT is the _right_ tool for audio compression, except possibly for very short blocks where time domain is much more important. jack. --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'vorbis-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.