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Lempel Ziv Welsh coding


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A class of algorithms which carries out data compression using a dictionary containing frequently found combinations of symbols: for example, the combination ‘the’ found in natural language texts. The algorithms replace these frequently occurring combinations of symbols by smaller combinations of symbols. The dictionary used in this method contains fixed length entries which occupy the same number of bits. A variant known as adaptive Lempel Ziv Welsh coding uses a variable length dictionary.

Subjects: Computing.


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