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2. Data compression - Wikipedia

   en.wikipedia.org/wiki/Data_compression

   The acceptable trade-off between loss of audio quality and transmission or storage size depends upon the application. For example, one 640 MB compact disc (CD) holds approximately one hour of uncompressed high fidelity music, less than 2 hours of music compressed losslessly, or 7 hours of music compressed in the MP3 format at a medium bit rate ...

3. PAQ - Wikipedia

   en.wikipedia.org/wiki/PAQ

   It compresses 7% worse, but is 7 times faster compared to PAQ8PX v66 (measured with 1 MB English text) PAQ9A was released on December 31, 2007, by Matt Mahoney. A new experimental version. It does not include models for specific file types, has an LZP preprocessor and supports files over 2 GB. ZPAQ was released on March 12, 2009, by Matt Mahoney.

4. Lossless compression - Wikipedia

   en.wikipedia.org/wiki/Lossless_compression

   In fact, if we consider files of length N, if all files were equally probable, then for any lossless compression that reduces the size of some file, the expected length of a compressed file (averaged over all possible files of length N) must necessarily be greater than N. [citation needed] So if we know nothing about the properties of the data ...

5. Phraselator - Wikipedia

   en.wikipedia.org/wiki/Phraselator

   As a tool for bridging any cultural differences or communicating effectively at any length, the Phraselator would not be recommended. This device, at least in the form tested, would best be used in large-scale operations where there is no time for language training and there is a need to communicate fixed ideas, quickly, over the greatest ...

6. Measuring network throughput - Wikipedia

   en.wikipedia.org/wiki/Measuring_network_throughput

   For file sizes, it is usual for someone to say that they have a '64 k' file (meaning 64 kilobytes), or a '100 meg' file (meaning 100 megabytes). When talking about circuit bit rates , people will interchangeably use the terms throughput , bandwidth and speed, and refer to a circuit as being a '64 k' circuit, or a '2 meg' circuit — meaning 64 ...

7. Disk compression - Wikipedia

   en.wikipedia.org/wiki/Disk_compression

   A disk compression software utility increases the amount of information that can be stored on a hard disk drive of given size. Unlike a file compression utility, which compresses only specified files—and which requires the user to designate the files to be compressed—an on-the-fly disk compression utility works automatically through resident software without the user needing to be aware of ...