Metaphone

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Metaphone is a phonetic algorithm, an algorithm published in 1990 for indexing words by their English pronunciation. The algorithm produces variable length keys as its output, as opposed to Soundex's fixed-length keys. Similar sounding words share the same keys.

Metaphone was developed by Lawrence Philips as a response to deficiencies in the Soundex algorithm. It uses a larger set of rules for English pronunciation. Metaphone is available as a built-in operator in a number of systems, including later versions of PHP.

The original author later produced a new version of the algorithm, which he named Double Metaphone, that produces more accurate results than the original algorithm.

Contents

Procedure

Metaphone codes use the 16 consonant symbols 0BFHJKLMNPRSTWXY[1]. The '0' represents "th" (as an ASCII approximation of Θ), 'X' represents "sh" or "ch", and the others represent their usual English pronunciations. The vowels AEIOU are also used, but only at the beginning of the code.[2]

See also

External links

Downloadable Implementations

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