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논문KCI 등재

한국 단음절어의 주파수중요기능 연구

The Study of Frequency Importance Function of the Korean Monosyllabic Words

김진숙|이경원
한국청각언어재활학회 (Korean Academy of Audiology)|2012.06|Audiology and Speech Research|제8권 제1호|pp. 24-33

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참고문헌

키워드

단음절어어음명료지수조음지수Articulation index절단주파수주파수중요기능.Cut-off frequencyFrequency importance functionMonosyllabic wordSpeech intelligibility index.

초록

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.

Abstract

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.

참고문헌 (34)

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