청각손실자의 청력 및 역동범위(dynamic range)의 개선, 어음청취력의 향상 등을 위해서는 청력손실의 종류, 정도 및 형태에 적절한 보청기의 이득(gain) 또는 주파수반응곡선(frequency response curve), 최대출력(saturation sound pressure level 90, SSPL90 또는 output sound pressure level 90, OSPL90), 압축역치(compression threshold, CT) 및 압축비율(compression ratio, CR) 등의 산출이 필요하다. 이를 위해서 영어 또는 이와 비슷한 언어를 사용하는 미국, 유럽 호주 등은 보청기처방법(hearing aid prescription method) 또는 보청기적합공식(hearing aid fitting
In order to develop Korean hearing aid prescription method, this study examined features of gain, frequency response curves, saturation sound pressure level 90 (SSPL90), output sound pressure level 90 (OSPL90), compression threshold (CT), and compression ratio (CR), and attack time (AT)/release time (RT) of linear and non-linear hearing aids. Futhermore, Korean studies related to characteristics of physique, psychoacoustics, speech and language effects were summarized. Following review and summarization, several suggestions for Korean hearing aid prescription method were also presented. Results showed that there were some differences in gain and frequency response curves, SSPL90 or OSPL90 among each hearing aid prescription methods despite the similarity of race and languages. Several factors were considered for calculating CT, CR, AT and RT, dynamic range, speech audibility, signal-to-noise ratio and tonal quality. However there were no agreements on the calculation of those parameters because several preferred factors were not identical among hearing impaired people. Korean hearing aid prescription method is not developed yet. Currently when the hearing aids are imported, fitting softwares with hearing prescription methods come without consideration of differences in acoustic characteristics of Korean language. In conclusion, we strongly suggest that various fundamental studies should be explored for the effective method for aural rehabilitation in Korean hearing impaired listeners. KEY WORDS：Fitting formula·Prescription method·Gain·SSPL90·OSPL90.
INTRODUCTION METHODS AND RESULTS CONCLUSIONS REFERENCES
