Prediction of energy decay in room impulse responses simulated with an image-source model
Prediction of energy decay in room impulse responses simulated with an image-source model
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DOI：
10.1121/1.2936367
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发表时间：
2008-07-01
影响因子：
2.4
通讯作者：
Johansson, Anders M.
中科院分区：
文献类型：
--
作者：
Lehmann, Eric A.;Johansson, Anders M.
提出了一种方法，提供了一个近似的声能衰减（能量-时间曲线），在房间脉冲响应产生的图像源技术。图像源原理的几何分析导致描述能量衰减曲线的封闭形式的表达式，所得到的公式对于外壳的六个吸收系数的均匀和非均匀定义是有效的。所提出的近似的准确性的基础上，涉及各种房间大小和混响水平，均匀和不均匀的吸声系数的脉冲响应模拟证明。所提出的方法的一个应用实例说明了考虑的任务，预测一个封闭的反射系数，以达到一个特定的混响水平。在这项工作中提出的技术，使设计人员进行初步分析的模拟混响环境，而不需要耗时的图像方法模拟。(c)2008年，美国声学学会。
A method is proposed that provides an approximation of the acoustic energy decay (energy-time curve) in room impulse responses generated using the image-source technique. A geometrical analysis of the image-source principle leads to a closed-form expression describing the energy decay curve, with the resulting formula being valid for a uniform as well as nonuniform definition of the enclosure's six absorption coefficients. The accuracy of the proposed approximation is demonstrated on the basis of impulse-response simulations involving various room sizes and reverberation levels, with uniform and nonuniform sound absorption coefficients. An application example for the proposed method is illustrated by considering the task of predicting an enclosure's reflection coefficients in order to achieve a specific reverberation level. The technique presented in this work enables designers to undertake a preliminary analysis of a simulated reverberant environment without the need for time-consuming image-method simulations. (c) 2008 Acoustical Society of America.