| 반향시간과 신호대잡음비가 정상성인과 난청노인의
단음절 어음재인도에 미치는 영향 |
| 이상백1, 구성민2, 임덕환3 |
1한림대학교 보건대학원 재활학과 청각학전공
2한림대학교 대학원 청각학전공
3한림대학교 언어청각학부 청각학전공, 청각언어연구소 |
| Effects of Reverberation Times and Signal to Noise Ratios on Discrimination
of Monosyllabic Words in Normal Young and Hearing-Impaired Elderly Subjects |
| Sang-Baek Lee1, Sung-Min Koo2, Dukhwan Lim3 |
1Section of Audiology, Graduate School of Public Health, Hallym University, Chuncheon, Korea
2Section of Audiology, Graduate School,Hallym University, Chuncheon, Korea
3Section of Audiology, Research Institute of Audiology & Speech Pathology, Hallym University, Chuncheon, Korea |
| Correspondence |
Dukhwan Lim ,Tel: (033) 248-2217, Fax: (02) 6280-9133, Email: dlim@hallym.ac.kr
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Received: January 15, 2008; Accepted: March 2, 2008. Published online: June 30, 2008. |
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| ABSTRACT |
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The reverberation time (RT60) was known as one of the major environmental variables that could affect auditory performances. The
purpose of this study was to investigate the effects of reverberation times and S/N ratios on discrimination scores of monosyllabic
words in normal and elderly adults. The participated subjects were eleven normal (with the mean age of 20.5 and mean HL of 1.7 dB)
and five elderly adults (with the mean age of 74.8 and mean HL of 38.4 dB. The reverberation time was digitally synthesized using
Sabine equation and the test set were RTs of 0, 24, 480, 960, 1,920, and 3,840 msec. The combined signal to noise ratios were at the
levels of -10, 0, and +10 dB with both contralateral and ipsilateral conditions. The results showed that monosyllabic word discrimination
scores were significantly influenced by reverberation times and S/N ratios. The elderly adults with reduced hearing status
exhibited greater difficulties as reverberation times increased and S/N ratios reduced. In these experimental groups, discrimination scores
reached the peak values at the positive RTs and the performance scores were deteriorated thereafter. This influence of noise was pronounced
under ipsilateral conditions. In conclusion, the degree and level of these discrepancies from those of normal subjects appeared
to be reliable quantitative indicators of higher levels of functional hearing status and could be used as practical performance measures
in auditory training and rehabilitation programs |
| Key Words:
Reverberation time·Signal to noise ratio·Word recognition score. |
| 중심단어:
반향시간· 신호대잡음비· 단음절 어음재인도. |
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