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KMID : 1022420160080040115
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Phonetics and Speech Sciences
2016 Volume.8 No. 4 p.115 ~ p.122
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The Lombard effect on the speech of children with intellectual disability
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Lee Hyun-Ju
Lee Ji-Yun
Kim Yu-Kyung
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Abstract
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This study investigates the acoustic?phonetic features and speech intelligibility of Lombard speech in children with intellectual disability, by examining the effect of Lombard speech at 3 levels of non-noise, 55dB, and 65dB. Eight children with intellectual disability read sentences and played speaking games, and their speech were analyzed in terms of intensity, pitch, vowel space of /a/, /i/, and /u/, VAI(3), articulation rate and speech intelligibility. Results showed, first, that intensity and pitch increased as noise level increased; second, that VAI(3) increased as the noise level increased; third, that articulation rate decreased as noise intensity increased; finally, that speech intelligibility increased as noise intensity increased. The Lombard speech changed the VAI(3), vowel space, articulation rate, speech intelligibility of the children with intellectual disability as well. This study suggests that the Lombard speech will be clinically useful for the persons who have intellectual disability and difficulties in self-control.
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KEYWORD
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Lombard effect, intellectual disability, speech intelligibility, VAI(3), vowel triangle space
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