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성인과 아동의 소음유형 및 신호대잡음비에 따른 단어인지도

Effects of Noise Type and Signal-to-Noise Ratio on Word Recognition Performance of Adults and Children with Normal Hearing Sensitivity

장현숙|전슬기
한국청각언어재활학회 (Korean Academy of Audiology)|2013.12|Audiology and Speech Research|제9권 제2호|pp. 137-147

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참고문헌

키워드

Word recognitionMulti-talker babble noiseSpeech noiseSignal-to-noise ratio (SNR)White noise

초록

The purpose of this study was to investigate effects of noise type and signal-to-noise ratio (SNR) on word recognition performance. Word recognition scores were measured in three types of noise conditions [white noise (WN), speech noise (SN), and multi-talker babble noise (MBN)], which were applied to various signal-to-noise ratio conditions (-5, 0, +5, +10, +15, and +20 dB SNR). Twenty adults and twenty school-aged children with normal hearing sensitivity participated. The results of this study are summarized as follows: First, the adults showed significantly increased word recognition performance as SNR increased from -5 dB to +10 dB in all the noise types. The scores for SN were significantly higher than those for the other noise types and there was no significant difference between MBN and WN. At least +10 dB SNR was required to maximize their recognition abilities in the SN and MBN conditions. Second, the children also showed significantly increased word recognition performance as it changed from +10 dB SNR to +20 dB SNR in three different noise types. Performances were significantly different among three types of noise, indicating SN, MBN, and WN from greatest to least. At least +20 dB SNR was required to maximize their recognition abilities in the SN and MBN conditions. Third. when comparing the performances between adults and children at the +10 dB SNR, there were significant differences between groups and among noise types. In conclusion, the results revealed word recognition to be affected by the function of SNR and type of noise. The findings show that SN and MBN can be more useful in clinical practice than WN, since even subjects with normal hearing showed very low performance in WN. Moreover, when comparing the performances between adults and children, approximately +10 dB SNR was required for children more than adults for their best word recognition performance.

Abstract

The purpose of this study was to investigate effects of noise type and signal-to-noise ratio (SNR) on word recognition performance. Word recognition scores were measured in three types of noise conditions [white noise (WN), speech noise (SN), and multi-talker babble noise (MBN)], which were applied to various signal-to-noise ratio conditions (-5, 0, +5, +10, +15, and +20 dB SNR). Twenty adults and twenty school-aged children with normal hearing sensitivity participated. The results of this study are summarized as follows: First, the adults showed significantly increased word recognition performance as SNR increased from -5 dB to +10 dB in all the noise types. The scores for SN were significantly higher than those for the other noise types and there was no significant difference between MBN and WN. At least +10 dB SNR was required to maximize their recognition abilities in the SN and MBN conditions. Second, the children also showed significantly increased word recognition performance as it changed from +10 dB SNR to +20 dB SNR in three different noise types. Performances were significantly different among three types of noise, indicating SN, MBN, and WN from greatest to least. At least +20 dB SNR was required to maximize their recognition abilities in the SN and MBN conditions. Third. when comparing the performances between adults and children at the +10 dB SNR, there were significant differences between groups and among noise types. In conclusion, the results revealed word recognition to be affected by the function of SNR and type of noise. The findings show that SN and MBN can be more useful in clinical practice than WN, since even subjects with normal hearing showed very low performance in WN. Moreover, when comparing the performances between adults and children, approximately +10 dB SNR was required for children more than adults for their best word recognition performance.

참고문헌 (33)

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