주파수대역, 신호대잡음비, 음원위치 변화가 건청성인과 난청성인의 단음절 어음재인도에 미치는 영향 = Effects of noise bands, signal to noise ratios and source directions on monosyllabic word recognition of normal and hearing-impaired adult subjects

다국어 초록 (Multilingual Abstract)

One of the common complaints with hearing loss was difficulty in understanding speech especially 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 (male:6, female:9 with the mean age of 25.5 years) while sensorineural hearing loss group had 10 subjects (male:6, female:4 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 60dB HL on various signal to noise ratios from -20dB to +20dB with a step size of 10dB. 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 1500Hz. Response interaction components were defined and computed as the difference between sum of responses (recognition scores) to two filtered 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. There, however, 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.

목차 (Table of Contents)

• I.서론 1
• II. 연구방법
• 1. 연구대상 4
• 2. 연구절차 7
• 3. 분석방법 9
• III. 연구결과 10
• IV. 고찰 64
• V. 요약 및 결론 68
• 참고문헌 70
• ABSTRACT 72
• 부록