Abstract This paper proposes a new approach for modelling and predicting the reverberation time in rectangular rooms with non-uniform absorption distribution. The model considers three separate decays for the three room dimensions and a fourth decay for the diffuse field. The sum of the four decays’ RMS-sound pressure values lead to a total decay curve, from which the reverberation time is obtained. Moreover, the model takes into account the absorption coefficients, empirical scattering coefficients at each room surface and lateral sound absorption from side walls. In rooms with a uniform absorption distribution, the calculated reverberation times are similar to those computed by the Eyring’s formula (C.F. Eyring: Reverberation Time in “Dead” Rooms. The Journal of the Acoustical Society of America Volume 1 (1930), p 168). In rooms with a non-uniform distribution, the modeled reverberation times are lengthened, consistent with measurements in previous studies over the whole frequency range. The paper discusses the comparison of calculation and measurement of decay curves and reverberation time, including other well-known simple prediction models.

中文翻译：

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非均匀吸收分布矩形房间混响时间的预测

摘要 本文提出了一种新的方法来模拟和预测具有非均匀吸收分布的矩形房间的混响时间。该模型考虑了三个房间维度的三个独立衰减和漫射场的第四个衰减。四个衰减的 RMS 声压值的总和导致总衰减曲线，从中获得混响时间。此外，该模型还考虑了吸收系数、每个房间表面的经验散射系数和侧壁的横向吸声。在具有均匀吸收分布的房间中，计算的混响时间类似于通过 Eyring 公式计算的混响时间（CF Eyring：“死”房间中的混响时间。美国声学学会杂志第 1 卷（1930），第 168 页） . 在分布不均匀的房间中，模拟混响时间会延长，这与之前研究在整个频率范围内的测量结果一致。本文讨论了衰减曲线和混响时间的计算和测量的比较，包括其他众所周知的简单预测模型。