2015 Fiscal Year Final Research Report
Developent of measurement method of material's acoustical properties by using a parametric loudspeaker
Project/Area Number |
26630260
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Research Category |
Grant-in-Aid for Challenging Exploratory Research
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Allocation Type | Multi-year Fund |
Research Field |
Architectural environment/Equipment
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Research Institution | The University of Tokyo |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
TAKEOKA Shigeto 静岡理工科大学, 理工学部, 講師 (30514468)
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Project Period (FY) |
2014-04-01 – 2016-03-31
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Keywords | 計測法 / 音響材料 / パラメトリックスピーカ |
Outline of Final Research Achievements |
Edge diffraction seriously affects measurement results of sound reflection and absorption, and as a result, accuracy of the measurement is often deteriorated in an acoustical measurement assuming a free sound field. Such an edge diffraction can be avoid by using a parametric loudspeaker, which has acute directivity characteristics, because the incident sound is concentrated to a center area of the measurement specimen and the sound being incident on the edge area is restrained. In this study, at first, a parametric loudspeaker being used for architectural acoustic measurement was produced experimentally. After investigation on fundamental characteristics of the produced sound source, applicability of the parametric loudspeaker to reflection characteristics of diffusive walls was experimentally confirmed.
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Free Research Field |
工学
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