Useful links to information describing audio file formats.

http://cui.unige.ch/OSG/info/AudioFormats/

Supporting material for a Wavelet course at Rowan University. There’s quite a bit of detail here. I don’t know if it stands on its own or whether it only works in conjunction with the course. Please check it out and provide feedback!

http://engineering.rowan.edu/~polikar/WAVELETS/WTtutorial.html

An overview and explanation about MP3 from the folks at Fraunhofer. If you want to get a good overview in a single web page, this might be the spot for you.

http://www.iis.fhg.de/amm/techinf/layer3/index.html

This company labels itself as “The world leader in end-to-end MPEG-4 Solutions.” Looks like they sell a suite of authoring and encoding tools, and perhaps some server software. Follow the link to “About MPEG-4″ and you’ll get a little bit of text plus some more links.

http://www.ivast.com/

Apple has a page with info on MPEG-4. They use this page to explain how this all fits in with QuickTime.

http://www.apple.com/mpeg4/

Notes for an Info Theory course at MIT.

http://www-mtl.mit.edu/Courses/6.095/notes/dct.html

Notes from an Information Theory course at MIT.

http://www-mtl.mit.edu/Courses/6.095/notes/LZW-examples.html

A guy named Steve Blackstock takes a shot at making this all clear to you. Gives some details on the LZW variation used in GIF files.

http://www.cis.udel.edu/%7Eamer/CISC651/lzw.and.gif.explained.html

Online demos of Fractal compression and decompression. Available in English, French, and German.

http://www.eurecom.fr/~image/DEMOS/FRACTAL/

A post by Edgar Binder discussing his distance coding algorithm. Distance coding is used in place of the MTF stage in BWT compression.

http://groups.google.com/groups?selm=390B6254.D5113AD2%40T-Online.de

This PDF file provides a two page overview of the Nancy codec and the company that’s behind it, NOA, Inc.

http://datacompression.info/Miscellaneous/LightVideoCodecNancyME.pdf

ACT - by Jeff Gilchrist. ACT is the Archive Comparison Test, a long running benchmark on well known archiving programs. Lots of good updates in May of 2002.

http://compression.ca/

From the archive: PPMd program is file-to-file compressor, it is written for embedding in user programs mainly and it is not intended for immediate use. I was interested in speed and performance improvements of abstract PPM model [1-5] only, without tuning it to particular data types, therefore compressor works good enough for texts, but it is not so good for nonhomogeneous files (executables) and for noisy analog data (sounds, pictures etc.).

ftp://ftp.elf.stuba.sk/pub/pc/pack/ppmdi1.rar

Nine slides that provide some description of the Nancy codec. You will have to ask Acrobat Reader to rotate the slides if you are trying to view them on the screen.

http://datacompression.info/Miscellaneous/NancyTechnologymobile.pdf

Six more slides describing the Nancy codec.

http://datacompression.info/Miscellaneous/NancyTechnologynetwork.pdf

This site has a nice collection of codecs, including DirectShow filters, MPG4, MJPEG, and other video codecs. A few audio codecs and AVI test sequences as well.

http://dshow.narod.ru/

Vcodex is a software collection for transforming data. Examples of data transformers include methods for compression/decompression, data differencing, encryption, etc. The source code distribution includes an implementation of Vcdiff using the framework.

http://www.research.att.com/sw/tools/vcodex/

DevX published this nice piece describing bit oriented I/O in Java. This might not be directly related to Data Compression, but it is a requirement in nearly all data compression software. This site may require registration, I’m not sure.

http://archive.devx.com/java/free/articles/gt052002/gt052002-1.asp

CNN reports on a research team at Cal Tech that has created a new algorithm for compressing 3D object representations. If you can figure out how it works from this article, send me an email!

http://www.cnn.com/2002/TECH/internet/05/24/3d.graphics.idg/index.html

EETimes has an article about this new single-chip MEPG-2 codec built around Toshiba’s Media Embedded Processor architecture.

http://www.eetimes.com/story/OEG20020515S0040

This is a free program that the author describes as a clone of WinZip. It is written entirely in Java and supports a nice variety of archive formats, including zip, jar, gzip, and bzip2 Requires Java 1.3, 1.4 is recommended. The 1.0 release shipped in May of 2002.

http://www.davidcampaign.net/dczip.html

Another archiver, this one supports ZIP, ACE, RAR, TAR, and ZOO formats. This appears to be a Korean product - the web page is bilingual.

http://www.alzip.com/

The page says:
The Almacom JPEG-2000 library was written in an effort to produce the cleanest and simplest implementation possible of the JPEG-2000 standard. We have put a particular emphasis on good architecture design and code simplicity, while at the same time providing an implementation as complete and efficient as possible.

DataCompression.info user Luca M. said I was looking for a good library of wavelets. Now I’ve found it !