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- Prefix_code abstract "A prefix code is a type of code system (typically a variable-length code) distinguished by its possession of the "prefix property"; which states that there is no valid code word in the system that is a prefix (start) of any other valid code word in the set. For example, a code with code words {9, 55} has the prefix property; a code consisting of {9, 5, 59, 55} does not, because "5" is a prefix of both "59" and "55". A prefix code is an example of a uniquely decodable code: a receiver can identify each word without requiring a special marker between words.Prefix codes are also known as prefix-free codes, prefix condition codes and instantaneous codes. Although Huffman coding is just one of many algorithms for deriving prefix codes, prefix codes are also widely referred to as "Huffman codes", even when the code was not produced by a Huffman algorithm. The term comma-free code is sometimes also applied as a synonym for prefix-free codes but in most mathematical books and articles (e. g.) it is used to mean self-synchronizing codes, a subclass of prefix codes.Using prefix codes, a message can be transmitted as a sequence of concatenated code words, without any out-of-band markers to frame the words in the message. The recipient can decode the message unambiguously, by repeatedly finding and removing prefixes that form valid code words. This is not always possible with codes that lack the prefix property, for example {0, 1, 10, 11}: a receiver reading a "1" at the start of a code word would not know whether that was the complete code word "1", or merely the prefix of the code word "10" or "11"; and the string "10" could be interpreted either as a single codeword or as the concatenation of the words "1" then "0".The variable-length Huffman codes, country calling codes, the country and publisher parts of ISBNs, the Secondary Synchronization Codes used in the UMTS W-CDMA 3G Wireless Standard, and the instruction sets (machine language) of most computer microarchitectures are prefix codes.Prefix codes are not error-correcting codes. In practice, a message might first be compressed with a prefix code, and then encoded again with channel coding (including error correction) before transmission.Kraft's inequality characterizes the sets of code word lengths that are possible in a uniquely decodable code.".
- Prefix_code wikiPageExternalLink index.html.
- Prefix_code wikiPageExternalLink Codes.html.
- Prefix_code wikiPageExternalLink scientific.html.
- Prefix_code wikiPageID "66193".
- Prefix_code wikiPageRevisionID "598396180".
- Prefix_code hasPhotoCollection Prefix_code.
- Prefix_code subject Category:Coding_theory.
- Prefix_code subject Category:Data_compression.
- Prefix_code subject Category:Lossless_compression_algorithms.
- Prefix_code subject Category:Prefixes.
- Prefix_code type Abstraction100002137.
- Prefix_code type Act100030358.
- Prefix_code type Activity100407535.
- Prefix_code type Affix106308049.
- Prefix_code type Algorithm105847438.
- Prefix_code type BoundMorpheme106306945.
- Prefix_code type Event100029378.
- Prefix_code type LanguageUnit106284225.
- Prefix_code type LosslessCompressionAlgorithms.
- Prefix_code type Morpheme106306233.
- Prefix_code type Part113809207.
- Prefix_code type Prefix106308304.
- Prefix_code type Prefixes.
- Prefix_code type Procedure101023820.
- Prefix_code type PsychologicalFeature100023100.
- Prefix_code type Relation100031921.
- Prefix_code type Rule105846932.
- Prefix_code type YagoPermanentlyLocatedEntity.
- Prefix_code comment "A prefix code is a type of code system (typically a variable-length code) distinguished by its possession of the "prefix property"; which states that there is no valid code word in the system that is a prefix (start) of any other valid code word in the set. For example, a code with code words {9, 55} has the prefix property; a code consisting of {9, 5, 59, 55} does not, because "5" is a prefix of both "59" and "55".".
- Prefix_code label "Code préfixe".
- Prefix_code label "Código prefijo".
- Prefix_code label "Kod prefiksowy".
- Prefix_code label "Prefix code".
- Prefix_code label "Präfixcode".
- Prefix_code label "Префиксный код".
- Prefix_code label "接頭符号".
- Prefix_code sameAs Prefixový_kód.
- Prefix_code sameAs Präfixcode.
- Prefix_code sameAs Código_prefijo.
- Prefix_code sameAs Code_préfixe.
- Prefix_code sameAs 接頭符号.
- Prefix_code sameAs Kod_prefiksowy.
- Prefix_code sameAs m.0hhz1.
- Prefix_code sameAs Q1278039.
- Prefix_code sameAs Q1278039.
- Prefix_code sameAs Prefix_code.
- Prefix_code wasDerivedFrom Prefix_code?oldid=598396180.
- Prefix_code isPrimaryTopicOf Prefix_code.