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KMID : 1022420140060030165
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Phonetics and Speech Sciences
2014 Volume.6 No. 3 p.165 ~ p.169
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Syllable-Type-Based Phoneme Weighting Techniques for Listening Intelligibility in Noisy Environments
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Lee Young-Ho
Joo Jong-Han
Choi Seung-Ho
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Abstract
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Intelligibility of speech transmitted to listeners can significantly be degraded in noisy environments such as in auditoriumand in train station due to ambient noises. Noise-masked speech signal is hard to be recognized by listeners. Among theconventional methods to improve speech intelligibility, consonant-vowel intensity ratio (CVR) approach reinforces the powersof overall consonants. However, excessively reinforced consonant is not helpful in recognition. Furthermore, only some ofconsonants are improved by the CVR approach. In this paper, we propose the corrective weighting (CW) approach thatreinforces the powers of consonants according to syllable-type such as consonant-vowel-consonant (CVC), consonant-vowel(CV) and vowel-consonant (VC) in Korean differently, considering the level of listeners' recognition. The proposed CWapproach was evaluated by the subjective test, Comparison Category Rating (CCR) test of ITU-T P.800, showed betterperformance, that is, 0.18 and 0.24 higher than the unprocessed CVR approach, respectively.
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KEYWORD
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noisy environment, speech intelligibility, syllable types, consonant-vowel intensity ratio (CVR), corrective weighting (CW)
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