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Soundex
Soundex is a phonetic algorithm for indexing names by sound, as pronounced in English. The goal is for homophones to be encoded to the same representation so that they can be matched despite minor differences in spelling.〔 The algorithm mainly encodes consonants; a vowel will not be encoded unless it is the first letter. Soundex is the most widely known of all phonetic algorithms (in part because it is a standard feature of popular database software such as DB2, PostgreSQL,〔(【引用サイトリンク】title=PostgreSQL: Documentation: 9.1: fuzzystrmatch )〕 MySQL,〔(【引用サイトリンク】title=MySQL :: MySQL 5.5 Reference Manual :: 12.5 String Functions - SOUNDEX )〕 Ingres, MS SQL Server〔(【引用サイトリンク】title=SOUNDEX (Transact-SQL) )〕 and Oracle〔(【引用サイトリンク】title=Soundex )〕) and is often used (incorrectly) as a synonym for "phonetic algorithm". Improvements to Soundex are the basis for many modern phonetic algorithms.〔(【引用サイトリンク】title=Phonetic Matching: A Better Soundex )〕
==History==
Soundex was developed by Robert C. Russell and Margaret King Odell and patented in 1918〔 ((Archived ))〕 and 1922.〔 ((Archived ))〕 A variation called American Soundex was used in the 1930s for a retrospective analysis of the US censuses from 1890 through 1920. The Soundex code came to prominence in the 1960s when it was the subject of several articles in the ''Communications'' and ''Journal of the Association for Computing Machinery'', and especially when described in Donald Knuth's ''The Art of Computer Programming''.
The National Archives and Records Administration (NARA) maintains the current rule set for the official implementation of Soundex used by the U.S. Government. These encoding rules are available from NARA, upon request, in the form of General Information Leaflet 55, "Using the Census Soundex".
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