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김재환(Kim, Jaehwan),임창우(Lim, Chang-Woo),정원태(Jeong, Wontae),홍지영(Hong, Jiyoung),정완섭(Cheung, Wansup),이수갑(Lee, Soogab) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.12
Measurement of noise is not only to know the information of acoustic pressure but to assess human response to noise. To find human response to transportation noise through the laboratory study we have to measure and reproduce noise. The method of noise reproduction is largely divided into monaural and binaural techniques. But human fundamentally hears sound through both ears, referred as binaural hearing. Binaural signal is different from monaural signal because it includes more information of physical phenomena like acoustical reflection, diffraction and refraction. Especially head and pinna play an important role in perceiving change of signal origin. So, the amplitude of binaural signal is higher than that of monaural signal and spectrum of both signals is discriminated. Most of assessment and regulation of transportation noise are, however, based on monaural measurement techniques. The quantitative difference between monaural and binaural measurement is investigated in this study. Comparison on several transportation noisesshows defect of information in monaural measurements.
김재환(Kim, Jaehwan),임창우(Lim, Chang-Woo),홍지영(Hong, Jiyoung),정원태(Jeong, Wontae),정완섭(Cheung, Wansup),이수갑(Lee, Soogab) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.12
This paper continues companion paper, part I : measurement and analysis. As shown in companion Paper, information and energy in monaural signal is quite different from that of binaural signal. In this paper, difference between monaural and binaural signal of transportation noise are investigated in subjective response test. We executed hearing screening test before giving a subject response test and excluded subjects who had physical hearing loss. An annoyance response test was conducted using headphone to avoid cross-talk effect in binaural testing. Percentage of highly annoyed under binaural signal reproduction is higher than percentage of highly annoyed under monaural signal reproduction. Result implies binaural reproduction technique is proper for a study of human response to short-term noise exposure in a headphone simulated-environment.