Descriptions of various speech codecs, include G.711, G.721, GSM, and CELP. Each codec gets a brief description plus pointers to additional material and source code.

http://rice.ecs.soton.ac.uk/jason/speech_codecs/standards/index.html

This portal site has a page dedicated to compression, plus a number of sub-pages with pointers to companies, researchers, and a few other odds and ends.

http://www.pin-outs.com/directory/Algorithms/Compression/

This company says they are a big name in the world of network streaming video. Products on their web side seem to be oriented towards MPEG.

http://www.optivision.com/

Zapex makes chips, chip cores, and boards dedicated to real time compression, including MPEG-2 and AC3.

http://www.zapex.com/

Sorenson makes hardware and software for video conferencing and other video streaming apps.

http://www.s-vision.com/

by Brendan J. Frey and Geoffrey E. Hinton. A new algorithm for generating efficient codes.

http://www.psi.toronto.edu/~frey/papers/stsc.abs.html

A grey-scale wavelet compressor written in C. Includes pointers to source code and the paper presented on this work.

http://www.cis.upenn.edu/~butch/EPWIC/

Pierre Moulin has authored quite a few papers on video and image compression. Unfortunately, the full text is available for only a few papers. Perhaps you could send Pierre an email asking him to put more stuff online.

http://www.ifp.uiuc.edu/~moulin/paper.html

PhD thesis by Geert Uytterhoeven. PS version might be in German.

http://home.tvd.be/cr26864/PhD/

An Internet-based video conferencing system. Why is it interesting to us? It apparently includes an H.261 codec.

http://www-sop.inria.fr/rodeo/ivs.html

Another Win32 archving program. The pgogram is free if you are willing to view ads, o/w $12.

http://www.cursorarts.com/ca_zw.html

John Savard develops an algorithm for optimally encoding messages when forced to use nothing but Morse code.

http://home.ecn.ab.ca/~jsavard/crypto/mi060307.htm

by Balkenhol, Bernhard; Kurtz, Stefan; Shtarkov, Yuri M. The authors discuss some statistical qualities of BWT output and improve on the algorithm’s performance. This paper was presented at the 1999 Data Compression Conference.

http://www.mathematik.uni-bielefeld.de/ahlswede/pub/balkenhol/dcc99.ps.gz

by Jeffrey N. Ladino. His description of the page: This page is a research project in the field of data compression algorithms. It is intended to be an informative overview for a beginner in the field of computer science. Mostly talks about lossless compression, with an explanation of Huffman coding.

http://www.ccs.neu.edu/groups/honors-program/freshsem/19951996/jnl22/jeff.html

Juergen writes a lot of papers. Lots and lots of papers. Looks like lots of stuff on neural nets and the like.

http://www.idsia.ch/~juergen/onlinepub.html

An audio compression format invented at NTT’s Cyber Space Laboratories. Get your player and compressor right here. (English avaible by following the sharp-eyed link.)

http://sound.splab.ecl.ntt.co.jp/

WIS Technologies sells software (both standalone and plugins) to perform various types of compression, including wavelet and DCT based lossly algorithms. In addition, they seem to be moving into the hardware business with the announcement of an ASIC JPEG2000 codec.

http://www.wischip.com/

The title says A website devoted to the principles and practices of data compression. Can’t ask for anything better than that. Appears to be run by Nam Phamdo from SUNY Stony Brook. Links to papers, explanations, and software.

User comment:Gives technical explanations and animated examples of a small number of compression methods. The explanations are good, but the amount of coverage of the field overall is small.

http://www.data-compression.com/

A nice overview of the field by Nam Phamdo, slanted a bit towards the academic view but at a very accessible level. Links to important and influential papers.

http://www.data-compression.com/theory.html

An overview of the topic by Nam Phamdo, with some basic definitions, plus a look at Huffman coding and LZ78/LZW coding.

http://www.data-compression.com/lossless.html

A short description of VQ by Nam Phamdo. Contains an animation which provides a nice picture of what actually happens in VQ.

http://www.data-compression.com/vq.html

A page on speech compression by Nam Phamd. Concentrates on LPC and CELP.

http://www.data-compression.com/speech.html

This program by Nam Phambdo doesn’t have any declaration regarding use, so please contact the author before attempting to use it.

Reader Prabhu S. pronounced this program “Nice.”

http://www.data-compression.com/lbgvq.c

This is supposed to be a 2.4 Kbps LPC speech codec.

http://www.arl.wustl.edu/~jaf/lpc/

This is reputed to be C source code for a GSM codec.

ftp://ftp.cs.tu-berlin.de/pub/local/kbs/tubmik/gsm/gsm-1.0.10.tar.gz

by Claude Shannon. This paper is generally credited with being the opening kickoff of the science of Information Theory.

http://cm.bell-labs.com/cm/ms/what/shannonday/shannon1948.pdf

According to the publisher, this contains all of Shannon’s published works, plus papers that were previously unpublished for various reasons, including wartime secrecy.

http://www.amazon.com/exec/obidos/ASIN/0780304349/theinternetdatac

by Thomas M. Cover, Joy A. Thomas. This is an introductory text on Info Theory, covering all the basics, which of course includes coding and data compression.

http://www.amazon.com/exec/obidos/ASIN/0471062596/theinternetdatac

by Lawrence R. Rabiner, Ronald W. Schafer. A basic overview of how to use DSP to deal with speech.

http://www.amazon.com/exec/obidos/ASIN/0132136031/theinternetdatac

by Manfred R. Schroeder. How about a customer review of this book?

http://www.amazon.com/exec/obidos/ASIN/3540643974/theinternetdatac