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→Prefix codes in use today: Add "variable-length Huffman codes" to examples, since it's listed in the intro |
Techniques for constructing a prefix code can be simple, or quite complicated.: Doesn't mean anything |
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==Techniques==
If every word in the code has the same length, the code is called a '''fixed-length code''', or a '''block code''' (though the term [[block code]] is also used for fixed-size [[error-correcting code]]s in [[channel coding]]). For example, [[ISO 8859-15]] letters are always 8 bits long. [[UTF-32/UCS-4]] letters are always 32 bits long. [[Asynchronous Transfer Mode|ATM packets]] are always 424 bits long. A block code of fixed length ''k'' bits can encode up to <math>2^{k}</math> source symbols.
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