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KMID : 1022420180100040111
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Phonetics and Speech Sciences
2018 Volume.10 No. 4 p.111 ~ p.119
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Performance of speech recognition unit considering morphological pronunciation variation
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Bang Jeong-Uk
Kim Sang-Hun
Kwon Oh-Wook
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Abstract
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This paper proposes a method to improve speech recognition performance by extracting various pronunciations of the pseudo-morpheme unit from an eojeol unit corpus and generating a new recognition unit considering pronunciation variations. In the proposed method, we first align the pronunciation of the eojeol units and the pseudo-morpheme units, and then expand the pronunciation dictionary by extracting the new pronunciations of the pseudo-morpheme units at the pronunciation of the eojeol units. Then, we propose a new recognition unit that relies on pronunciation by tagging the obtained phoneme symbols according to the pseudo-morpheme units. The proposed units and their extended pronunciations are incorporated into the lexicon and language model of the speech recognizer. Experiments for performance evaluation are performed using the Korean speech recognizer with a trigram language model obtained by a 100 million pseudo-morpheme corpus and an acoustic model trained by a multi-genre broadcast speech data of 445 hours. The proposed method is shown to reduce the word error rate relatively by 13.8% in the news-genre evaluation data and by 4.5% in the total evaluation data.
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KEYWORD
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pronunciation variation, decoding unit, pseudo-morpheme, Korean LVCSR
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