Archives
TwinVQ
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, Inc.
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/Data-compression.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 […]
Theory of Data Compression
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.htmlLossless Data Compression
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.htmlVector Quantization
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.htmlSpeech Compression
A page on speech compression by Nam Phamd. Concentrates on LPC and CELP.
http://www.data-compression.com/speech.htmlAn LBG VQ program in C
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.cLPC-10 speech coder software
This is supposed to be a 2.4 Kbps LPC speech codec.
http://www.arl.wustl.edu/~jaf/lpc/13 kbps GSM speech coder.
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.gzA Mathematical Theory of Communication
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.pdfClaude Elwood Shannon : Collected Papers
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/theinternetdatacElements of Information Theory
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/theinternetdatacDigital Processing of Speech Signals
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/theinternetdatacComputer Speech : Recognition, Compression, Synthesis
by Manfred R. Schroeder. How about a customer review of this book?
http://www.amazon.com/exec/obidos/ASIN/3540643974/theinternetdatacread more from " Computer Speech : Recognition, Compression, Synthesis "
Information Content and Compression Limit FAQ
How much can a given piece of data be compressed? This FAQ addresses that question, including some necessary critiques of the question itself. Graham Fyffe apparently spends some time thinking about complexity.
http://www.geocities.com/CollegePark/9315/infofaq.htmread more from " Information Content and Compression Limit FAQ "
Principles of compression techniques
A set of slides, apparently for a course talking about data compression.
http://www.cdt.luth.se/~johnny/courses/smd074_1999_2/CodingCompression/kap28/slide0.htmlSource and Executables for the Amiga
A huge selection of compression source and executables for the enigmatic Amiga.. I don’t know if this is a mirror site or independent.
ftp://us.aminet.net/pub/aminet/util/pack/UB Video, Inc.
UB Video says:
UB Video Inc., based in Vancouver, Canada, is a leading provider of coding and transcoding software solutions for video communications. UB Video provides software products that run on desktop PCs as well as on programmable Digital Signal Processors and Media Processors. UB Video’s products include:
Encoders/Decoders
H.261 (Libraries/Source code)
H.263/H.263+ (Libraries/Source code, Encoder/Decoder DirectShow filters, Video […]
http://www.ubvideo.com/Neural Network Text Compression Programs and Papers
A couple of programs using neural networks for compression, along with a couple of papers by the author. This area of data compression is definitely underserved, check out what’s here and see if neural networks deserve more attention than they are getting.
Update: This page appears to now have some links to general lossless benchmarking info.
http://cs.fit.edu/~mmahoney/compression/read more from " Neural Network Text Compression Programs and Papers "
Data Compression and Encryption Algorithms
Douglas W. Jones, University of Iowa Department of Computer Science. This page contains some C source for a Splay Tree algorithm.
http://www.cs.uiowa.edu/~jones/compress/read more from " Data Compression and Encryption Algorithms "
Sub-Linear Decoding of Huffman Codes Almost In-Place
A paper by Andrej Brodnik and Svante Carlsson. A data structure that lets you decode Huffman streams super-duper quick.
ftp://www.ijp.si/pub/preprints/ps/98/pp600.psread more from " Sub-Linear Decoding of Huffman Codes Almost In-Place "
MUSICompress Home Page
The home page of the MUSICompress lossless compression method.
http://hometown.aol.com/sndspace/index.htmlVery Low bit rate speech coding
A project at Cambridge University that led to a low bit rate speech coder that was used in the HP 620LX Palmtop PC.
http://svr-www.eng.cam.ac.uk/~ajr/speechCoding.htmlIntelligent Compression Technologies
A company that speciailizes in providing compression technology to other companies.
http://www.ictcompress.com/Professor John G. Cleary
One of the many academics interested in data compression at University of Waikato in New Zealand. Cleary has been involved in many important developments in the field.
http://www.cs.waikato.ac.nz/Staff/john-g.-cleary.htmlSPACL
The Signal Processing and Coding Laboratory (SPACL) at The University of Arizona has some papers on line, plus some information on their current projects. They seem to be interested in wavelets, quantization, and signal coding.
A DCL reader complained: Very little useful information on the website. On topic, but not helpful at all.
Huffman Compression
A straightforward discussion of Huffman compression. Written at a level so that it can be understood without much experience in data compression or programming.
http://home.ecn.ab.ca/~jsavard/crypto/mi0601.htmCisco V.44 Press Release
Cisco talks a bit about new products using V.44 compression licensed from Hughes Network Systems. A few claims, not much in the way of facts.
http://www.cisco.com/warp/public/146/pressroom/2000/jul00/sp_071100.htm