1.1 该测试方法描述了一种客观评估开放空间中位置之间语音隐私的方法。该测试方法依赖于声学测量、公布的语音水平信息和评估语音通信的标准方法。该测试方法不测量影响语音隐私的单个开放式组件的性能；相反，它评估了由特定组件配置产生的隐私 ( 1. , 2. ) . 2. 1.2 该测试方法旨在作为实际开放空间中语音隐私评估的现场测试。然而，该测试方法可用于模拟空间和布置为模拟开放式空间的环境中。 1.3 该测试方法适用于许多开放式空间，包括传统的开放式办公室、重点区域和协作空间。 除办公楼外，医疗楼、机构空间、学校等也会出现此类空间。它不直接适用于测量开放式和封闭式空间之间或全封闭空间之间的语音隐私。 1.4 该测试方法依赖于清晰度指数，该指数客观地预测语音的可懂度。虽然清晰度指数和该测试方法都可以可靠地预测语音隐私，但两者都不能预测提供给特定个体居住者的特定有效语音隐私。 1.5 以国际单位制表示的数值应视为标准。括号中的英寸-磅单位仅供参考。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 开放式空间中位置之间的语音隐私由侵入语音超过听者耳朵周围声压级的程度决定；典型的信噪比情况。 5. 2. 入侵者语音在听者耳中的声压级取决于: 5.2.1 说话者的个人发声努力和方向， 5.2.2 语音信号因距离或干扰障碍而衰减，以及 5.2.3 由于天花板、家具面板、灯具、墙壁或窗户等表面的反射而增强语音信号。 5.3 为了使用电子声音屏蔽系统屏蔽入侵语音，通常必须提高空间内的环境声级。然而，在某些位置和特定频率范围内，建筑机械、电气和管道（MEP）设备以及供暖、通风或空调设备（HVAC）可能会增加环境声级或增加色调噪声成分，这些成分可能需要在调谐掩蔽声之前进行缓解。 5.4 该测试方法的主要目的是使用标准清晰度指数方法评估平均语音频谱的语音隐私。这需要测量中讨论的相关声学特性 5.2 和 5.3 用于一对位置和使用平均语音频谱计算清晰度指数。平均语音频谱适用于与 典型的 语音效果。在特定情况下，例如为“重点工作”指定的安静工作区，已采取行政措施降低语音水平，a “休闲” 语音频谱应用于计算语音隐私，而在指定的“协作工作”小组工作区中，如果希望进行生动的讨论，则需要 '凸起' 语音频谱应用于计算语音隐私。 5.5 清晰度指数的范围从低值0.00（通常认为语音不可理解）到高值1.00（所有单个口语词都可以理解）。在解释该测试方法的数字人工智能结果时应谨慎，因为对于相同的人工智能值，理解的单个单词、短语和句子的百分比将不同 ( 5. ) . 5.6 本试验方法可用于: 5.6.1 比较开放式空间内不同位置之间提供的相对语音隐私。 5.6.2 评估开放式组件（障碍物、家具、天花板、掩蔽声或墙板）的变化如何影响语音隐私。 5.6.3 客观评估语音隐私与主观反应的相关性。 5.7 该测试方法可以是性能或验收测试程序的一个要素。 然而，需要指定许多额外的项目，以允许使用该测试方法进行开放式环境的性能测试，例如，要测试的位置数量和选择这些位置的方法，以及评估结果的方法。验收测试还需要根据清晰度指数指定数字标准；然而，考虑到中讨论的最先进技术，应谨慎选择此类标准和允许偏差 5.5 .

1.1 This test method describes a means of objectively assessing speech privacy between locations in open plan spaces. This test method relies upon acoustical measurements, published information on speech levels, and standard methods for assessing speech communication. This test method does not measure the performance of individual open plan components which affect speech privacy; but rather, it assesses the privacy which results from a particular configuration of components ( 1 , 2 ) . 2 1.2 This test method is intended to be a field test for the assessment of speech privacy in actual open plan spaces. However, this test method could be used in mock-up spaces and in environments arranged to simulate an open plan space. 1.3 This test method is suitable for use in many open plan spaces including traditional open offices, focus areas, and collaboration spaces. In addition to office buildings, these types of spaces will also be found in healthcare buildings, institutional spaces, schools, etc. It is not directly applicable for measuring the speech privacy between open plan and enclosed spaces or between fully enclosed spaces. 1.4 This test method relies upon the Articulation Index, which objectively predicts the intelligibility of speech. While both the Articulation Index and this test method can be expected to reliably predict speech privacy, neither predicts the specific effective speech privacy afforded to particular individual occupants. 1.5 The values stated in SI units are to be regarded as the standard. The inch-pound units in parentheses are for information only. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The speech privacy between locations in an open plan space is determined by the degree to which intruding speech sounds exceed the ambient sound pressure levels at the listener's ear; a classic signal-to-noise ratio situation. 5.2 The sound pressure levels at the listener's ear from intruding speech depend upon: 5.2.1 The individual vocal effort and orientation of the talker, 5.2.2 The attenuation of speech signals due to distance or intervening barriers, and 5.2.3 The reinforcement of speech signals due to reflections from surfaces such as the ceiling, furniture panels, light fixtures, walls, or windows. 5.3 The ambient sound levels within a space often must be increased in order to mask intruding speech using an electronic sound masking system. However, in certain locations and in specific frequency ranges, the building mechanical, electrical and plumbing (MEP) equipment, and the heating, ventilating, or air conditioning equipment (HVAC) may increase ambient sound levels or add tonal noise components that may require mitigation before tuning the masking sound. 5.4 The primary purpose of this test method is to assess the speech privacy for an average speech spectrum using the standard Articulation Index method. This requires measurement of the relevant acoustical characteristics discussed in 5.2 and 5.3 for a pair of locations and calculation of the Articulation Index using an average speech spectrum. The average speech spectrum is for male talkers speaking with normal voice effort. In specific cases such as designated quiet work zones for ‘focused work’ where administrative measures have been taken to reduce speech levels, a ‘casual’ voice spectrum should be used to calculate speech privacy, whereas in designated group work zones for ‘collaborative work’ where lively discussion is expected, a ‘raised’ voice spectrum should be used to calculate speech privacy. 5.5 The Articulation Index ranges from a low value of 0.00, where speech is generally perceived to be unintelligible, to a high value of 1.00, where all individual spoken words can be understood. Caution should be exercised in interpreting the numerical AI results of this test method since the percentage of single words, phrases, and sentences understood will be different for the same AI value ( 5 ) . 5.6 This test method can be used to: 5.6.1 Compare the relative speech privacy afforded between different locations within open plan spaces. 5.6.2 Evaluate how changes in open plan components (barriers, furniture, ceilings, masking sound, or wall panels) affect speech privacy. 5.6.3 Assess speech privacy objectively for correlation with subjective responses. 5.7 This test method could be one element of a performance or acceptance test procedure. However, many additional items would need to be specified to allow the use of this test method for performance testing of an open plan environment, such as, the number of locations to be tested and method of selecting those locations, and the method of assessing the results. Specifying a numerical criterion in terms of the Articulation Index is also necessary for acceptance testing; however, the selection of such a criterion and permissible deviations should be undertaken with care in view of the present state-of-the-art as discussed in 5.5 .