描述开放式办公室言语水平空间衰减的单个数字量的测量不确定度和唯一性
Measurement uncertainty and unicity of single number quantities describing the spatial decay of speech level in open-plan offices
摘要：
ISO 3382-3标准（2012年）定义了评估开放式办公室声学质量的单一数字量（SNQ），但没有解决测量不确定性的问题。本研究重点探讨了该标准中与语音空间衰减相关的SNQ，即D2 S、LpAS 4 m和rc。我们的目的是提供额外的信息，这些SNQ的测量不确定性的有限的文献，通过使用分析的发展和基于模拟的随机方法。通过模拟一系列办公室内的声音传播（1种布局，16种声学配置，不同的屏幕高度和屏幕和天花板的不同声学质量），研究了分析开发的准确性。仿真得到的信噪比范围较宽：D2 S在3.4 ~ 7.5dB（A）之间，LpAS 4 m在40.6 ~ 51.9dB（A）之间，rc在2.5 ~ 14.7m之间。因此，模拟代表了一组广泛的声学质量。在包括7个测量位置的测量路径上，D 2S的估计不确定度为0.4 dB（A），L pAS 4 m的估计不确定度在0.4和0.7 dB（A）之间变化，r c的估计不确定度在0.2和1.5 m之间变化。模拟还提出了使用单一指标值描述办公室声学质量的问题。仿真结果表明，在某些情况下，D2 S值对测量路径有很大的依赖性，如果考虑一个唯一的D2 S值，则会导致其测量不确定度的大幅增加.
英文摘要：
The ISO 3382-3 standard (2012) defines single number quantities (SNQs) which evaluate the acoustic quality of open-plan offices, but does not address the issue of measurement uncertainties. This study focusses on the SNQs present in this standard related to spatial decay of speech, i.e. D 2S , L pAS4m and r c. The aim is to provide additional information to the limited literature on the measurement uncertainties of these SNQs by use of both analytical developments and a stochastic approach based on simulations. The accuracy of the analytical developments was studied thanks to simulations of the sound propagation within a series of offices (1 layout, 16 acoustic configurations with different screen heights and different acoustic qualities of screens and ceiling). The SNQs obtained in the simulations cover a wide range: D 2S between 3.4 and 7.5 dB(A), L pAS4m between 40.6 and 51.9 dB(A) and r c between 2.5 and 14.7 m. Therefore, the simulations are representative of a broad set of acoustic qualities. Estimated uncertainties have a magnitude of 0.4 dB(A) for D 2S and vary between 0.4 and 0.7 dB(A) for L pAS4m and between 0.2 and 1.5 m for r c over a measurement path comprising 7 measurement positions. The simulations also raise the question of describing the acoustic quality of an office using a single value for the indicators. The results of the simulations show that in some cases, D 2S values significantly depend on the measurement path, leading to a strong increase of its measurement uncertainty if a unique value is to be considered.
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