Investigations on the Directional Energy Decay Curves in Reverberation Rooms
Investigations on the Directional Energy Decay Curves in Reverberation Rooms
复制标题
混响室定向能量衰减曲线的研究
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
M. Vorländer
中科院分区：
文献类型：
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作者：
Marco Berzborn;M. Vorländer
随机入射吸收系数是根据国际标准ISO-354在混响室中测量的，前提是房间内的声场是扩散的。然而，大量研究表明该方法具有很高的不确定性，并且结果的实验室间重现性较差。假设这些问题部分是由于违反扩散要求引起的。目前缺乏用于混响室声场扩散的可靠度量，这证明混响室的表征和校准是一个复杂的问题。为了研究混响室中声场的扩散性，本研究讨论了定向房间脉冲响应 (DRIR) 的分析以及相应定向能量衰减曲线的空间偏差。应用球形阵列处理方法，根据声场分解为构成声场的平面波来计算 DRIR。基于模拟球形麦克风阵列测量，检查具有不同声场扩散程度的混响室的多种配置。
The random incidence absorption coefficient is measured according to the international standard ISO-354 in a reverberation room with the prerequisite of the sound field in the room being diffuse. However, numerous studies showed high uncertainties in the method and a poor inter-laboratory reproducibility of the results. The assumption was drawn that these problems are in part caused by the violation of the diffuseness requirement. A robust metric for the diffuseness of sound fields in reverberation rooms is currently lacking, proving the characterization and calibration of reverberation rooms a complex problem. To investigate the diffuseness of sound fields in reverberation rooms this study discusses the analysis of directional room impulse responses (DRIRs) and the spatial deviation of the corresponding directional energy decay curves. Applying spherical array processing methods, the DRIRs are calculated based on the decomposition of the sound field into plane waves composing the sound field. Multiple configurations of a reverberation room with varying degrees of sound field diffuseness are examined based on simulated spherical microphone array measurements.