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Audiol > Volume 4(1); 2008 > Article
Audiology 2008;4(1): 52-57.
Published online: June 30, 2008.
doi: http://doi.org/10.21848/audiol.2008.4.1.52
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
Received: March 21, 2008;  Accepted: April 28, 2008.  Published online: June 30, 2008.
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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