Estimating Mid-Frequency Effects of Aperture Diffraction on Reverberant-Energy Decay in Coupled-Room Auditoria
Estimating Mid-Frequency Effects of Aperture Diffraction on Reverberant-Energy Decay in Coupled-Room Auditoria
复制标题
估计耦合房间礼堂中孔径衍射对混响能量衰减的中频影响
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Y. Shimizu
中科院分区：
文献类型：
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作者：
J. Summers;R. Torres;Y. Shimizu
孔径衍射的混响能量衰减耦合室的反射镜的影响估计在中频，定义为频率以上的施罗德频率的子房间，但具有孔径的特征尺寸的顺序的波长。混合模型的开发，占在孔径波的影响，但在子房间使用高频模型治疗声场。该模型给出了随机入射功率传输系数的更准确的估计。这些估计同意与独立的测量薄，硬屏幕的圆孔。当用于预测衍射的影响，在一个示意性的代表性的典型的耦合室cavitoria，新的中频模型表明，衰减曲线上的衍射的影响，而小于由于输入参数的不确定性的变化，是足够大的声音。
Effects of aperture diffraction on reverberant energy decay in coupled-room auditoria are estimated at mid frequencies, defined as frequencies above the Schroeder frequencies of subrooms, but having wavelengths of the order of the characteristic dimensions of apertures. Hybrid models are developed that account for wave effects at apertures but treat sound fields in subrooms using high-frequency models. The models give more accurate estimates of the random-incidence power transmission coefficient. These estimates agree well with independent measurements of circular apertures in thin, hard screens. When used to predict the effects of diffraction in a schematic representation of typical coupled-room auditoria, new mid-frequency models suggest that effects of diffraction on decay curves, while smaller than variations due to input-parameter uncertainty, are large enough to be audible.