| 주파수대역, 신호대잡음비, 음원위치 변화가 건청성인과
난청성인의 단음절 어음재인도에 미치는 영향 |
| 이성희1, 임덕환2 |
1한림대학교 보건대학원 재활학과 청각학전공
2한림대학교 언어청각학부 청각학전공, 청각언어연구소 |
| Effects of Noise Bands, Signal to Noise Ratios, and Source Directions on Monosyllabic
Word Recognition in Normal and Hearing-Impaired Adult Subjects |
| Seonghee Lee1, Dukhwan Lim2 |
1Section of Audiology, Graduate School of Public Health, Hallym University, Chuncheon, Korea
2Section of Audiology, Research Institute of Audiology & Speech Pathology, Hallym University, Chuncheon, Korea |
| Correspondence |
Dukhwan Lim ,Tel: (033) 248-2217, Fax: (033) 6280-9133, Email: dlim@hallym.ac.kr
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Received: March 21, 2008; Accepted: April 28, 2008. Published online: June 30, 2008. |
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| ABSTRACT |
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One of the common complaints with hearing loss was difficulty in understanding speech in noisy environments. Effects of noise bands
on monosyllabic word recognition were investigated in normal and hearing-impaired adult subjects under various signal to ratios and
source directions. Normal hearing group contained 15 subjects (6 males and 9 females with the mean age of 25.5 years) while sensorineural
hearing loss group had 10 subjects (6 males and 4 females with the mean age of 67.7 years). Subjects with sensorineural
hearing loss were wearing hearing aids unilaterally for at least more than three months. Signals consisted of monosyllabic words which
were fixed at 60 dB HL on various signal to noise ratios from –20 dB to +20 dB with a step size of 10 dB. They were presented
through a loudspeaker at a distance of one meter in front of the subjects under different conditions (S0N0, S0N90, S90N0). Monosyllabic
recognition scores were collected in response to white noise, low pass filtered noise, and high pass filtered noise with a cutoff
frequency of 1,500 Hz. Response interaction components were defined and computed as the difference between sum of responses
(recognition scores) to two filtered noise bands and the individual response to white noise. Results showed that significantly different
interactions were noted between normal and sensorineural hearing loss groups on all conditions (P<0.05). The largest interactions
resulted from the data between -20 dB of SNR (signal to noise ratios) when signal and noise were presented in front of the
normal adult subjects (S0N0). In general, interaction components were significantly increased as SNRs (signal to noise ratios) were
decreased. However, there were no significant differences under various source directions and SNRs (except S0N0 condition) in the
hearing impaired with hearing aids group. The overall outcomes indicated that selective data from interaction components could be
used to evaluate the status of hearing loss and effectiveness of rehabilitation programs. |
| Key Words:
Frequency bands·Signal to noise ratio·Source location·Word recognition score·Interaction component. |
| 중심단어:
주파수 대역· 신호대잡음비· 음원위치· 단음절어음재인도· 간섭효과. |
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