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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 requires that there is no code word in the system that is a prefix (initial segment) of any other code word in the system. 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 "59" and also of "55". A prefix code is 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.) a comma-free code is used to mean a self-synchronizing code, 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 or (alternatively) special markers between words to frame the words in the message. The recipient can decode the message unambiguously, by repeatedly finding and removing sequences that form valid code words. This is not generally 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"; so 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 Codes.html.
• Prefix_code wikiPageExternalLink index.html.
• Prefix_code wikiPageExternalLink scientific.html.
• Prefix_code wikiPageID "66193".
• Prefix_code wikiPageLength "9209".
• Prefix_code wikiPageOutDegree "63".
• Prefix_code wikiPageRevisionID "648773144".
• Prefix_code wikiPageWikiLink Asynchronous_Transfer_Mode.
• Prefix_code wikiPageWikiLink Block_code.
• Prefix_code wikiPageWikiLink Cambridge_University_Press.
• Prefix_code wikiPageWikiLink Category:Coding_theory.
• Prefix_code wikiPageWikiLink Category:Data_compression.
• Prefix_code wikiPageWikiLink Category:Lossless_compression_algorithms.
• Prefix_code wikiPageWikiLink Category:Prefixes.
• Prefix_code wikiPageWikiLink Channel_coding.
• Prefix_code wikiPageWikiLink Charles_E._Leiserson.
• Prefix_code wikiPageWikiLink Clifford_Stein.
• Prefix_code wikiPageWikiLink Code.
• Prefix_code wikiPageWikiLink Code_word.
• Prefix_code wikiPageWikiLink Country_calling_codes.
• Prefix_code wikiPageWikiLink Elias_delta_coding.
• Prefix_code wikiPageWikiLink Elias_gamma_coding.
• Prefix_code wikiPageWikiLink Elias_omega_coding.
• Prefix_code wikiPageWikiLink Entropy_encoding.
• Prefix_code wikiPageWikiLink Error-correcting_code.
• Prefix_code wikiPageWikiLink Error-correcting_codes.
• Prefix_code wikiPageWikiLink Fibonacci_coding.
• Prefix_code wikiPageWikiLink Forward_error_correction.
• Prefix_code wikiPageWikiLink Frame_synchronization.
• Prefix_code wikiPageWikiLink Framing_(telecommunication).
• Prefix_code wikiPageWikiLink Golomb_Rice_code.
• Prefix_code wikiPageWikiLink Golomb_coding.
• Prefix_code wikiPageWikiLink Huffman_coding.
• Prefix_code wikiPageWikiLink ISBN.
• Prefix_code wikiPageWikiLink IEC_8859-15.
• Prefix_code wikiPageWikiLink ISO_8859-15.
• Prefix_code wikiPageWikiLink Instruction_set.
• Prefix_code wikiPageWikiLink International_Standard_Book_Number.
• Prefix_code wikiPageWikiLink Introduction_to_Algorithms.
• Prefix_code wikiPageWikiLink Krafts_inequality.
• Prefix_code wikiPageWikiLink Levenshtein_coding.
• Prefix_code wikiPageWikiLink List_of_country_calling_codes.
• Prefix_code wikiPageWikiLink Lossless_compression.
• Prefix_code wikiPageWikiLink Lossless_data_compression.
• Prefix_code wikiPageWikiLink Morse_code.
• Prefix_code wikiPageWikiLink Out-of-band_data.
• Prefix_code wikiPageWikiLink Prefix_(computer_science).
• Prefix_code wikiPageWikiLink Ron_Rivest.
• Prefix_code wikiPageWikiLink Ronald_L._Rivest.
• Prefix_code wikiPageWikiLink Scientific_American.
• Prefix_code wikiPageWikiLink Self-synchronizing_code.
• Prefix_code wikiPageWikiLink Shannon-Fano_coding.
• Prefix_code wikiPageWikiLink Shannon–Fano_coding.
• Prefix_code wikiPageWikiLink Straddling_checkerboard.
• Prefix_code wikiPageWikiLink Substring.
• Prefix_code wikiPageWikiLink Thomas_H._Cormen.
• Prefix_code wikiPageWikiLink Truncated_binary_encoding.
• Prefix_code wikiPageWikiLink UMTS.
• Prefix_code wikiPageWikiLink UTF-32.
• Prefix_code wikiPageWikiLink UCS-4.
• Prefix_code wikiPageWikiLink UTF-8.
• Prefix_code wikiPageWikiLink Unary_coding.
• Prefix_code wikiPageWikiLink Unicode.
• Prefix_code wikiPageWikiLink Uniquely_decodable_code.
• Prefix_code wikiPageWikiLink Universal_Mobile_Telecommunications_System.
• Prefix_code wikiPageWikiLink Universal_code_(data_compression).
• Prefix_code wikiPageWikiLink VCR_Plus.
• Prefix_code wikiPageWikiLink VIC_cipher.
• Prefix_code wikiPageWikiLink Variable-length_code.
• Prefix_code wikiPageWikiLink Video_recorder_scheduling_code.
• Prefix_code wikiPageWikiLink W-CDMA.
• Prefix_code wikiPageWikiLink W-CDMA_(UMTS).
• Prefix_code wikiPageWikiLinkText ""prefix property"".
• Prefix_code wikiPageWikiLinkText "Prefix code".
• Prefix_code wikiPageWikiLinkText "Prefix code#Related concepts".
• Prefix_code wikiPageWikiLinkText "Prefix code#Techniques".
• Prefix_code wikiPageWikiLinkText "prefix code".
• Prefix_code wikiPageWikiLinkText "prefix".
• Prefix_code wikiPageWikiLinkText "prefix-free binary code".
• Prefix_code hasPhotoCollection Prefix_code.
• Prefix_code wikiPageUsesTemplate Template:Cite_book.
• Prefix_code wikiPageUsesTemplate Template:Cite_journal.
• Prefix_code wikiPageUsesTemplate Template:FS1037C.
• Prefix_code wikiPageUsesTemplate Template:Reflist.
• 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 hypernym System.
• Prefix_code type Article.
• Prefix_code type Affix.
• Prefix_code type Algorithm.
• Prefix_code type Article.
• Prefix_code type Datum.
• Prefix_code type Encoding.
• Prefix_code type Prefix.
• Prefix_code type Source.
• 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 requires that there is no code word in the system that is a prefix (initial segment) of any other code word in the system. 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 "59" and also of "55".".
• Prefix_code label "Prefix code".

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