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KMID : 1022420140060020073
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Phonetics and Speech Sciences
2014 Volume.6 No. 2 p.73 ~ p.79
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Comparison of Acoustic Phonetic Characteristics of Korean Fricative Sounds Pronounced by Hearing-impaired Children and Normal Children
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Kim Yun-Ha
Kim Eun-Yeon
Jang Seung-Jin
Choi Yae-Lin
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Abstract
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Alveolar fricative sounds /s/ and /s'/ are learned last for normal children in the speech development process for Koreans. These are especially difficult to articulate for hearing-impaired children often causing articulation errors. The acoustic phoneticevaluation uses testing tools to provide indirect and object information. These objective resources can be compared withstandardized resources on speech when interpreting the results of a test. However, most previous studies in Korea did notconsider acoustic studies that used the spectrum moment values of hearing-impaired children. Therefore, this study wasconducted to compare the characteristics of hearing-impaired children's pronunciation of fricative sounds using spectrummoment values. For this purpose, the study selected a total of 10 hearing-impaired children (5 boys and 5 girls) currently in3rd or 5th grade and attending one of the elementary schools in Seoul or Gyeonggi-do. For the selection process, their age,type of hearing aid, implantation of hearing aid (CI) before two years of age, hearing capacity (dB) before and after wearingthe hearing aid, duration of speech rehabilitation, and time of learning alveolar fricative sounds were all considered. Also, 10normal children (5 boys and 5 girls) were selected among 3rd or 5th grade students attending one of the elementary schoolsin Seoul or Gyeonggi-do. The subjects were asked to read the carrier sentence, "I say _______," including a list of 12meaningless syllables composed of CV and VCV syllables, including alveolar fricative sounds /s/ and /s'/ and vowels /a/, /i/,and /u/. The recorded resources were processed through the Time-frequency Analysis Software Program to measure M1(mean), M2 (variance), M3 (skewness), and M4 (kurtosis) of the fricative noise. No significant differences were found whencomparing spectrum threshold values in the acoustic phonetic characteristics of hearing-impaired children and normal childrenin alveolar fricative sound pronunciation according to vowels /a/, /i/, and /u/, alveolar fricative sounds /s/ and /s'/, andsyllable structure (CV, VCV) other than, for M3 in the comparison of groups according to disability. In the comparison ofsyllable structures, there were statistically significant differences in M1, M2, M3, and M4 with clinical significance. However,there was no significant difference in results when comparing the alveolar fricative sounds according to the vowels.
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KEYWORD
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Hearing-impaired, Acoustic Phonetic Analysis, Alveolar Fricative Sound, Spectrum Moment
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