Effects of Noise Parameters on Discriminating “Gom” and “Gong”
Under Binaural Condition

Chung, Doohwan; Koo, Sungmin; Lim, Dukhwan

doi:2006.2.1.33

Audiol > Volume 2(1); 2006 > Article

Research Paper

Audiology 2006;2(1): 33-39.
Published online: June 30, 2006.
doi: http://doi.org/10.21848/audiol.2006.2.1.33

양이 청취 조건하에서 잡음 특성이“곰/공” 음소변별에 미치는 영향

정두환¹, 구성민¹, 임덕환²

¹한림대학교 대학원 청각학
²한림대학교 언어청각학부 청각학전공, 청각언어연구소

Effects of Noise Parameters on Discriminating “Gom” and “Gong” Under Binaural Condition

Doohwan Chung¹, Sungmin Koo¹, Dukhwan Lim²

¹Graduate Program in Audiology, Hallym University, Chuncheon, Korea
²Section of Audiology, Audiology and Speech Pathology Research Institute, Hallym University, Chuncheon, Korea

Correspondence

Dukhwan Lim ,Tel: (033) 248-2217, Fax: (02) 6280-9133, Email: dlim@hallym.ac.kr

Received: March 5, 2006; Accepted: May 11, 2006. Published online: June 30, 2006.

ABSTRACT

The effects of noise spectral bands on phoneme discrimination between “gom” and “gong” were studied under binaural hearing conditions for twenty young adults. The competing phonemes were provided under the broadband noise of 0.02-10 kHz, lowpass filtered noise of 1 kHz cutoff frequency, bandpass filtered noise of 1-3 kHz band, and highpass filtered noise of 3 kHz cutoff frequency. The phase of each filtered noise was shifted under binaural condition by 180 degree. Presentations with background noises were grouped in terms of signal to noise levels of -10 dB, 0 dB, and +10 dB SNR. Stimuli were digitally synthesized and two alternative forced choice (2AFC) method was used to collect the corresponding discrimination scores. The results were as follow：(A) In low pass noise, critical frequency region for discriminating final phonemes of “gom” and “gong” was approximately below 1 kHz. (B) High pass noise band had little effects on discrimination task and this indicated the noise range could be outside the critical band of the phonemes. (C) The effect of BMLD also could not be observed in data under high pass filtered noise since the frequency band was outside the critical band of the phonemes. (D) Some SNRs had significant effects on discriminating competing phonemes. The outcome indicated the needs for similar studies on competing phonemes for various placements. The data can be used to elaborate new methods of auditory evaluation, optimal fitting of hearing aids, and effective mapping of cochlear implants under the binaural condition.

Key Words: Two alternative forced choice (2AFC)·BMLD·Critical band·Binaural hearing.

중심단어: 2AFC· 양이차폐레벨차이· Critical band· 양이청취.