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KMID : 1022420090010030109
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Phonetics and Speech Sciences
2009 Volume.1 No. 3 p.109 ~ p.115
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Exclusion of Non-similar Candidates using Positional Accuracy based on Levenstein Distance from N-best Recognition Results of Isolated Word Recognition
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Yun Young-Sun
Kang Jeom-Ja
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Abstract
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Many isolated word recognition systems may generate non-similar words for recognition candidates because they use only acoustic information. In this paper, we investigate several techniques which can exclude non-similar words from N-best candidate words by applying Levenstein distance measure. At first, word distance method based on phone and syllable distances are considered. These methods use just Levenstein distance on phones or double Levenstein distance algorithm on syllables of candidates. Next, word similarity approaches are presented that they use characters’ position information of word candidates. Each character’s position is labeled to inserted, deleted, and correct position after alignment between source and target string. The word similarities are obtained from characters’ positional probabilities which mean the frequency ratio of the same characters’ observations on the position. From experimental results, we can find that the proposed methods are effective for removing non-similar words without loss of system performance from the N-best recognition candidates of the systems.
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KEYWORD
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isolated word recognition, N-best candidate selection, positional accuracy, word similarity
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