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Optimization-based method for the calibration of geometrical acoustic models

机译：基于优化的几何声学模型校准方法

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摘要

Uncertainty of the final results of room acoustic modelling is a result of uncertainties of many model input parameters, which have to be discovered and limited if possible. It can be done by model calibration. In this paper, a detailed procedure of room acoustic model calibration is proposed. It is based on detection and limitation of possible sources of discrepancies between measured and simulated selected room acoustic parameters defined in ISO 3382-1 standard. As independent parameters which describe the variability of the acoustic field in the room the most accurately, clarity C-80 and early decay time EDT are suggested. Based on uncertainty analysis, sound absorption coefficients of all materials used in the interior and selected sound scattering coefficients as well as positions of the receivers are chosen to be input parameters adjusted in the model calibration process. Correction of these parameters is done using optimization algorithms in order to accelerate the procedure. Methods for choosing key ray-tracing simulation parameters are presented, according to which it is possible to obtain repeatable results in the shortest possible time. All analyses are done for five different interiors (three philharmonics and two churches). Correctness of sound absorption/scattering coefficients calculated in the calibration process is validated in the comparison of simulation and measurement results, using a different sound source position. Obtained results are specific for analysed rooms, but proposed methodology is universal for all kinds of room acoustic models. (C) 2020 Published by Elsevier Ltd.
机译：房间声学建模的最终结果的不确定性是许多模型输入参数的不确定性的结果，如果可能的话，必须发现和有限。它可以通过模型校准来完成。在本文中，提出了一种室内声学模型校准的详细程序。它基于在ISO 3382-1标准中定义的测量和模拟所选择的所选房间声学参数之间可能的差异差异的检测和限制。作为描述房间中声场的可变性的独立参数，最准确，清晰度C-80和早期衰减时间EDT。基于不确定性分析，内部和所选声音散射系数中使用的所有材料的声音吸收系数以及接收器的位置被选择为在模型校准过程中调整的输入参数。使用优化算法进行这些参数的校正，以便加速程序。提出了用于选择关键射线跟踪模拟参数的方法，根据该方法，可以在最短的时间内获得可重复的结果。所有分析都完成了五种不同的内部（三个腓单母和两个教堂）。在校准过程中计算的声音吸收/散射系数的正确性在模拟和测量结果的比较中验证了使用不同的声源位置。获得的结果特定于分析的房间，但提出的方法是适用于各种房间声学模型的普遍性。 （c）2020由elestvier有限公司发布

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