Calculation of impulse responses and acoustic parameters in a hall by the finite-difference time-domain method
Calculation of impulse responses and acoustic parameters in a hall by the finite-difference time-domain method
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DOI：
10.1250/ast.29.256
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发表时间：
2008-07
影响因子：
0.7
通讯作者：
S. Sakamoto;Hiroshi Nagatomo;A. Ushiyama;H. Tachibana
中科院分区：
文献类型：
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作者：
S. Sakamoto;Hiroshi Nagatomo;A. Ushiyama;H. Tachibana
采用时域有限差分法（FDTD）计算了某厅堂内的脉冲响应，得到了典型的室内声学参数。并将计算结果与实际测量结果进行了比较。在FDTD计算中，阻抗边界条件由包括质量、弹簧和阻尼器的等效机械系统建模。为了计算冲击响应，通过应用阻抗管法测量大厅内不同表面的内装饰材料的法向声阻抗，并确定相应部分的房间边界条件模型。计算值与实测值的比较表明，混响时间RT，清晰度D50，清晰度C80，中心时间Ts的值在中频波段是很好的协议。然而，在低频带，由于在确定和建模的边界条件的困难，观察到很大的差异。
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 Ts 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.