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윤태건(Taekun Yun),심현진(Hyunjin Sim),이해진(Haejin Lee),이정윤(Jungyoun Lee),오재응(Jaeeung Oh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
Since human listening is very sensitive to sound, a subjective index of a sound quality is required. Therefore, in the analysis for each situation, the sound evaluation is composed with sound quality factor. Many researchers spends their effort to make a more reliable and more accurate of sound in term of sound quality index for various system noise. In this study a reliable index is constructed and analyzed using correlation analysis, regression analysis and weighting factor for each sound quality factor. We have made the sound quality index that agrees with more than human subjective sensitivity which apply to various sound quality metrics. Also we applied a 'grade' metric to jury for sound evaluation, analyzed relation between sound quality index and sound quality grade. Then we will judge the sound quality level according to the sound quality grade scheme.
실험계획법을 이용한 차량 공조시스템의 시끄러움과 날카로움 분석
심현진(Hyoun-Jin Sim),윤태건(Taekun Yun),박상길(Sang-Gil Park),이해진(Hae-Jin Lee),이정윤(Jung-Yoon Lee),오재응(Jae-Eung Oh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Since human listening is very sensitive when the sound hit him, the subjective index of sound quality is required. Therefore, at each situation of sound evaluation its composed with the sound quality factor. But, when substituting the level of one frequency band we could not see the tendency of substitution at whole frequency band during the sound quality evaluation. In this study a design of experiment is used. The frequency domain is divided into an equally 12 parts and each level of domain whether is given increase or decrease due to the change of frequency band based on ‘loud’ and ‘sharp’ of the sound quality is analyzed. By using the design of experiment the number of test is reduce very effectively by the number of experiment and each band the main effect will be as a solution. The case of sound quality for ‘loud’ and ‘sharp’ at each band, the change of band (increase or decrease of sound pressure or keep maintain) which will be the most effects on the characteristics of sound quality can be identify and this will be able to us to select the objective frequency band. Through these obtained results the physical changes of level at arbitrary frequency domain sensitivity can be adapted.