청력손실의 종류 및 주파수별 청력손실의 정도에 따라 보청기의 이득(gain) 및 최대출력(OSPL90) 등을 효과적으로 결정하는 것은 쉽지 않다. 이러한 이유로 주로 영어음을 사용하는 국가에서는 이득 및 OSPL90을 효과적으로 결정하기 위하여 보청기적합공식(hearing aid fitting formula)을 만들어 사용하고 있다. 보청기적합공식의 특징으로 선형증 폭기는 청력역치레벨(hearing threshold level, HTL)을 근거로 하여 청력손실자의 쾌적수준(most comfortable level, MCL)을 정상으로 회복하는 것을 목표로 하는 것이 일반적이며,2)4)17) 비선형증폭기는 감각신경성 난청인의 좁아진 역 동범위(dynamic range)를 정상 청력인과 유사한 형태로
The purpose of this study was to investigate loudness growth perception including most comfortable level (MCL), uncomfortable level (UCL) for Korean with normal hearing. 48 subjects (24 males and 24 females) with the age ranged 19-24 (M 21.9 yr, SD 1.8) years were participated in this study. Loudness growth test (LGT) were examined by 7 categories using FM tone of 500 Hz, 3,000 Hz and Korean two syllable words. The results of LGT were as follows：1) There were no significant gender differences in all categories using FM tone of 500 and 3,000 Hz (p>0.05). 2) significant differences were noted for FM tone (500 Hz, 3,000 Hz) in MCL and UCL (p<0.01). 3) UCL for male’s live voice was higher than female’s one using Korean two syllable words (p<0.01). 4) Comparing LGT with Korean and English showed no significant differences (p>0.05). Loudness growth perception data for normals and hearingimpaired listeners should be considered to help hearing aid fitting for the Korean hearing impaired. KEY WORDS：Loudness growth test·MCL·UCL.
INTRODUCTION MATERIALS AND METHODS RESULTS DISCUSSIONS CONCLUSION REFERENCES
