| Project/Area Number |
12650606
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Architectural environment/equipment
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| Research Institution | Kyushu Kyoritsu University |
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Principal Investigator |
FURUYA Hiroshi Kyushu Kyoritsu Univ., Faculty of Engineering, Professor, 工学部, 教授 (00238700)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIMOTO Kazutoshi Kyushu Kyoritsu Univ., Graduate School of Human-Environment Studies, Professor, 大学院・人間環境学研究院, 教授 (90112309)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Listener envelopment / Late-arriving sound / Arrival direction / Psychological experiments / Acoustical measurement / Concert auditoria / Acoustic design index |
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| Research Abstract |
The purpose of this study is to investigate the relation between the arrival direction of late sound and perceived listener envelopment (LEV). A series of psychological experiments were conducted with three-dimensional simulated sound fields in an anechoic chamber. Firstly, the effect of late energy arriving from four fundamental directions on perceived LEV was individually investigated. The results show that the lateral sound level gives the highest correlation with LEV, while late sound arriving from overhead and behind the listener also correlates to LEV very strongly and positively. Secondly, the experiments were conducted to make clear the degree of contribution of directional energy components of late sound to LEV. The results show that not only lateral level but also the late sounds from behind and overhead affect LEV significantly. Furthermore, directional late energy ratios were varied with a constant level of total late energy. From the result, the degree of contribution of lateral, back and overhead late energy ratios to LEV was found. Objective measurements were performed in auditoria to clarify the directional characteristics of late sounds, which correlated with listener envelopment. The measured values with directional microphones reveal the ranges of the level variation of lateral, longitudinal and vertical late energy in real sound fields. It is also found that the level attenuation coefficient of vertical component is highest. Furthermore, directional late energy ratios are considered in order to account for the spatial balance of late sound arriving at a receiver. A proper directional distribution of late reflections should also be considered in order to realize the feeling of being surrounded by sound images. Further research on the optimum conditions for the directional distribution of late sound is needed.
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