표준(standards)에 관한 국제규정(ANSI, 1996；ISO, 1996；IEC, 1993)에 의하면 어음청각검사(speech audiometry)를 위한 청각검사기의 기준음압레벨(reference sound pressure level, RSPL)은 기준어음인지역치레벨(reference speech recognition threshold level, RSRTL)에 근거하고 있다. 이러한 규정에 따르면, RSRTL은 정상청력의 젊은 성인남녀를 대상으로 한 강강격 이음절어 또는 적절한 어음을 사용한 심리측정기능검사(psychometric function test)에서 50% 또는 중앙치(median)의 어음인지도(speech recognition score)를 보여주는 소리크기를 의미한
According to the international regulations for the standards, the reference sound pressure level (RSPL) for speech audiometry (SA) is based on the reference speech recognition threshold level (RSRTL). The RSRTL for Korean speech audiometry is not established yet. Thus, the purpose of this study was to obtain basic data for calculating the RSRTL using Korean speech sounds. Subjects consisted of 42 adults with normal hearing sensitivity. Puretone thresholds (PTs) were obtained in 2 dB steps at each octave band. Korean 70 bisyllabic words were used to measure speech recognition thresholds (SRTs). The SRT was defined as the level at 50% of correct responses based on the logistic regression analysis for the results of the psychometric function test. The test was performed from -6 dB HL up to the level at or above 95% of correct responses in 2 dB steps. Results showed that the mean SRT was 26.59 dB SPL with the standard deviation of 4.25 dB, which was 6.59 dB greater than the RSRTL of English speech sounds. These results suggest that the RSRTL be recalculated for Korean speech audiometry for each type of headphone. KEY WORDS：Reference sound pressure level (RSPL)·Reference speech recognition threshold level (RSRTL)·Korean speech audiometry (KSA).
INTRODUCTION METHODS RESULTS DISCUSSIONS REFERENCES
