Effect of boundary diffusers in a reverberation chamber: standardized diffuse field quantifiers.
Effect of boundary diffusers in a reverberation chamber: standardized diffuse field quantifiers.
复制标题
混响室中边界扩散器的影响：标准化扩散场量化器。
DOI：
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发表时间：
2014
影响因子：
2.4
通讯作者：
M. Vorländer
中科院分区：
文献类型：
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作者：
David T. Bradley;M. Müller;Jacob Adelgren;M. Vorländer
混响室内的声场必须具有高度的扩散性，以允许各种声学量的精确测量。通常，悬挂或旋转扩散器面板安装在腔室中以努力实现该扩散率。然而，这两种扩散器类型都具有一定的局限性，并且通常难以实现足够的声场扩散率。一个1：5比例的混响室已被用来系统地分析相对有效性的悬挂扩散器与替代扩散器类型称为边界扩散器。为了表征声场扩散率，使用了来自ASTM E90、ASTM C423和ISO 354标准的三个量化器：最大吸收系数、衰减率的标准差和总置信区间。量化器数据的分析表明，边界扩散器和悬挂扩散器在声场中产生大致相等的扩散。数据还表明，标准具有一定的不一致性，可以混淆声场扩散率的表征，这可以解释以前文献中记录的再现性和可重复性问题。
The sound field inside a reverberation chamber must have a high degree of diffusivity to allow for the accurate measurement of various acoustic quantities. Typically, hanging or rotating diffuser panels are installed in the chamber in an effort to achieve this diffusivity. However, both of these diffuser types have certain limitations, and adequate sound field diffusivity is often difficult to realize. A 1:5 scale reverberation chamber has been used to systematically analyze the relative effectiveness of hanging diffusers versus an alternative diffuser type referred to as a boundary diffuser. To characterize sound field diffusivity, three quantifiers from the ASTM E90, ASTM C423, and ISO 354 standards have been used: maximum absorption coefficient, standard deviation of decay rate, and total confidence interval. Analysis of the quantifier data reveals that boundary diffusers and hanging diffusers produce roughly equivalent diffusion in the sound field. The data also show that the standards have certain inconsistencies that can obfuscate the characterization of sound field diffusivity, which may explain reproducibility and repeatability issues previously documented in the literature.