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자료유형
학술저널
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저널정보
한국청각언어재활학회 Audiology and Speech Research Audiology and Speech Research 제8권 제1호
발행연도
2012.1
수록면
24 - 33 (10page)

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초록· 키워드

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Speech intelligibility index (SII) can be utilized for predicting speech recognition abilities of the hearing impaired based on the pure tone thresholds. For calculation of SII, frequency importance function (FIF) has to be produced considering the language characteristics. The purpose of this study was to derive FIF at 1/3 and 1 octave frequency bands using recently developed Korean standard monosyllabic word lists for adults (KS-MWL-A). KS-MWL-A speech materials were presented to normal hearing 17 adults, age ranging from 19 to 25, after filtering with 7 high pass filters (HPFs) and low pass filters (LPFs) combined with Korean speech shaped noise. The cut-off frequencies (COFs) of the LPF were 224, 447, 891, 1413, 2239, 3548, 5623 Hz and the HPF were 447, 891, 1413, 2239, 3548, 5623 Hz. Signal-to-noise ratios (SNRs) were -10 to +8 dB by 2 dB steps. Relative speech intelligibility index (R-SII) were derived by word recognition scores (WRSs) as a function of COFs at each SNR. Finally, FIFs were calculated by cumulative curves as function of frequencies. Regression equation of R-SII and WRS as a function of SII showed cubic function as y = 41.77x3-159.01x2+208.31x-4.08 (R2 = 0.992, p < .000). As Korean R-SII increased 0.0 to 0.5, WRS increased rapidly comparing to English R-SII. Maximum FIFs of KS-MWL-A showed 0.2190 at 800 Hz by 1/3 octave band frequency and 0.4507 at 1,000 Hz by 1 octave band frequency. Crossover frequencies of KS-MWL-A showed 1,518-1,941 Hz and increased as SNR increased. All the results were different from English monosyllabic words. The results of this study can be utilized for calculating hearing aid fitting formula, for determining aims, and effective process of auditory training. However, further study should be performed using various speech materials such as Korean sentence and short passages and etc.

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