Calculation of impulse responses and acoustic parameters in a hall by the finite-difference time-domain method

• Sakamoto Shinichi

  Institute of Industrial Science, the University of Tokyo

• Nagatomo Hiroshi

  Brüel & Kjær Division of Spectris Co., Ltd., Japan

• Ushiyama Ayumi

  Daiwa house industry Co., Ltd.

• Tachibana Hideki

  Chiba Institute of Technology

抄録

Impulse responses in a hall were calculated by the finite-difference time-domain (FDTD) method, and typical room acoustic parameters were obtained from the responses. The calculated parameters were compared with those actually measured in the hall. In the FDTD calculation, the impedance boundary condition was modeled by an equivalent mechanical system comprising masses, springs, and dampers. To calculate the impulse responses, the normal acoustic impedance of the interior finishing materials of the various surfaces in the hall were measured by applying the impedance-tube method, and the model of the room boundary condition was determined for the respective parts. A comparison between the calculated and measured values showed that the values of reverberation time RT, definition D₅₀, clarity C₈₀, and center time T_s were in good agreement in the middle-frequency bands. However, in low-frequency bands, large discrepancies were observed because of the difficulties in determining and modeling the boundary conditions.

収録刊行物

• Acoustical Science and Technology

  Acoustical Science and Technology 29 (4), 256-265, 2008

  一般社団法人 日本音響学会

キーワード

• Finite-difference time-domain method
• Impulse response
• Acoustic parameters

詳細情報

• CRID: 1390001205090188672
• NII論文ID: 110006792928
• NII書誌ID: AA11501808
• DOI: 10.1250/ast.29.256
• ISSN: 13475177
• ISSN: 03694232
• ISSN: 13463969
• NDL書誌ID: 9554179
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9554179
• Web Site: http://www.jstage.jst.go.jp/article/ast/29/4/29_4_256/_pdf
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10573120
• 本文言語コード: en
• データソース種別:
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  • NDL
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  • CiNii Articles
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