배경소음의 유형이 정상인의 어음인지력에 미치는 영향 = Effects of Various Background Noises on Speech Intelligibility of Normal Hearing Subjects

다국어 초록 (Multilingual Abstract)

Background and Objectives：In auditory tests, several kinds of background noises have been used；multitalker babble noise,
speech noise and white noise, etc. The aim of the present study was to evaluate the effects of different types of background noises
on speech intelligibility. Subjects and Method：Sixty volunteers having pure-tone thresholds less than 25 dB HL participated
in this study. Their ages ranged from teens to sixties with ten subjects in each age group (mean age=40±15.4 years, m=25, f=
35) We used three types of background noises used in this study；multitalker babble noise using the voices of Korean
speakers, speech noise using English sentences and white noise. Fifty percent recognition of signal to noise ratios (SNRs) and
word recognition scores (WRSs) at -10, -5, 0 dB SNR conditions were measured at 70 dB HL of noise intensity. Results：Fifty
percent recognition of SNRs on multitalker babble, speech and white noise were -12.4±1.4 dB, -13.7±1.0 dB and -15.8
±1.0 dB, respectively and they were significantly different each other (p<0.05). Multitalker babble noise generated the lowest
WRSs followed by speech noise and then white noise (p<0.05). Conclusion：These results support that multitalker babble
noise using the voices of Korean speakers influence on normal listener’s speech intelligibility more than speech noise from
English sentences or white noise.

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