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This file is part 2 of a set of Frequently Asked Questions for the groups comp.compression and comp.compression.research. If you did not get part 1 or 3, you can get them at http://www.faqs.org/faqs/compression-faq/part1/preamble.html or or ftp://rtfm.mit.edu/pub/usenet/news.answers/compression-faq/ If you don't want to see this FAQ regularly, please add the subject line to your kill file. If you have corrections or suggestions for this FAQ, send them to Jean-loup Gailly <jloup at gzip.org>. Thank you. Contents ======== Part 2: (Long) introductions to data compression techniques  Introduction to data compression (long) Huffman and Related Compression Techniques Arithmetic Coding Substitutional Compressors The LZ78 family of compressors The LZ77 family of compressors  Introduction to MPEG (long) What is MPEG? Does it have anything to do with JPEG? Then what's JBIG and MHEG? What has MPEG accomplished? So how does MPEG I work? What about the audio compression? So how much does it compress? What's phase II? When will all this be finished? How do I join MPEG? How do I get the documents, like the MPEG I draft?  What is wavelet theory?  What is the theoretical compression limit?  Introduction to JBIG  Introduction to JPEG  What is Vector Quantization?  Introduction to Fractal compression  The Burrows-Wheeler block sorting algorithm (long) Part 3: (Long) list of image compression hardware  Image compression hardware  Acknowledgments Search for "Subject: [#]" to get to question number # quickly. Some news readers can also take advantage of the message digest format used here.