1.1 本试验方法涵盖了开放式空间三个组成部分的区域间衰减测量: 1.1.1 与部分高度空间分隔器结合使用时的天花板系统。这种安排通常用于办公室，以在没有全高隔板的情况下实现工作区之间的语音隐私。本试验方法适用于任何天花板配置，例如，包括其他吸声天花板中的反光板图案。该试验方法通常需要使用高度为1.50 m[5 ft]的固定空间分隔器。考虑到开放式办公环境中隔墙高度变化的趋势，可根据本标准进行隔墙高度变化的测量。 1.1.2 在开放式空间中用作隔音屏障的家具面板，在工作位置之间提供语音隐私或隔音。 1.1.3 垂直面板，包括墙壁饰面，如吸音板，以及可能反射声音的家具面板或屏风。如果窗户饰面或家具（面板除外）与平壁板有显著差异，则其可能不适用于此类项目。 1.1.4 开放式办公室各组成部分的结果组合超出了本标准的范围。 1.2 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物； 因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.3 除非另有规定，否则本试验方法中规定的所有尺寸应理解为公差为±6 mm（± 1. / 4. 英寸。）以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.4 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。 1.5 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 在开放式空间中提供语音隐私取决于许多因素，其中最重要的是: (1) 部分高度空间分割器的阴影区和来自空间分割器边缘的声音衍射； (2) 天花板系统的主要声反射特性； (3) 空间中存在的掩蔽声级；和 (4) 说话者和听者之间的距离。指导 E1374 提供了有关影响开放式空间中语音隐私的因素的更多详细信息。 5.2 在该测试方法中，消除了第三个因素，即掩蔽声，并对所有样本类型的第四个因素，即说话者和听者之间的距离进行了标准化。对于天花板系统的测量，第一个因素，阴影区，也针对所使用的每个分隔高度进行了标准化。经验表明，通过该测试方法获得的结果可能无法公平地代表非平天花板系统可能实现的语音隐私。 对于用作隔声屏障的家具面板的测量，这些因素中的第二个因素，即天花板的声音反射率，是标准化的。对于用作墙面装饰或家具面板的反射和吸收垂直表面的测量，第一和第二个因素是标准化的，并且消除了扬声器和听者之间仅从天花板反射的所有路径。 5.3 该测试方法提供了标准化技术，以评估开放式空间的特定组件的贡献。试验方法规定了每种部件类型的声学试验环境，该环境将其贡献与其他部件的贡献隔离开来，而其他部件可能在实际打开状态下- 规划环境对整体语音隐私有很大贡献。 5.4 对于可达到的测量精度，还必须考虑通过本试验方法获得的试验结果的重要性。在存在掩蔽声的情况下，语音隐私的实现在很大程度上取决于语音相对于掩蔽声的声级；语音或掩蔽声音中的小到2 dB的变化可能会将隐私从显著改变为不显著。通常公认的声衰减测量的测试精度可能不足以评估具有开放环境边缘区间衰减性能的部件- 办公室需求。

1.1 This test method covers the measurement of the interzone attenuation for three components of open-plan spaces: 1.1.1 Ceiling systems when used in conjunction with partial-height space dividers. This arrangement is commonly used in offices to achieve speech privacy between work zones in the absence of full-height partitions. This test method is applicable to any ceiling configuration, including, for example, a pattern of sound-reflective panels in an otherwise sound-absorptive ceiling. This test method generally requires use of a fixed space divider height of 1.50 m [5 ft]. In recognition of trends toward alternate divider heights in open office environments, measurements with an alternate divider height may be conducted in accordance with this standard. 1.1.2 Furniture panels used as acoustical barriers in open-plan spaces to provide speech privacy or sound isolation between working positions. 1.1.3 Vertical panels, including wall finishes such as sound-absorbent panels, and furniture panels or screens which may reflect sound. It may not be applicable to such items as window finishes or furniture other than panels if these differ significantly from flat wall panels. 1.1.4 The combination of results from the various components of an open-plan office is beyond the scope of this standard. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.3 Unless otherwise qualified, all dimensions specified in this test method shall be understood to have a tolerance of ±6 mm (± 1 / 4 in.) The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information only. 1.4 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. 1.5 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 Providing speech privacy in open-plan spaces depends upon many factors, the most significant of which are the following: (1) the shadow zone of part-height space dividers and the diffraction of sound from the edges of space dividers; (2) the primary sound reflective properties of the ceiling system; (3) the level of masking sound present in the space; and (4) the distance between speaker and listener. Guide E1374 provides additional detail on the factors contributing to speech privacy in open-plan spaces. 5.2 In this test method the third factor, masking sound, is eliminated and the fourth factor, the distance between speaker and listener, is standardized for all specimen types. For the measurement of ceiling systems, the first factor, the shadow zone, is also standardized for each divider height used. Experience has indicated that results obtained by this test method may not fairly represent the speech privacy that may be achievable with non-flat ceiling systems. For the measurement of furniture panels used as acoustical barriers, the second of these factors, the sound reflectance of the ceiling, is standardized. For the measurement of reflective and absorptive vertical surfaces used as wall finishings or furniture panels, the first and second factors are standardized and all paths between the speaker and listener reflecting only off of the ceiling are eliminated. 5.3 This test method provides standardized techniques to assess the contribution of specific components of an open-plan space. The test method specifies an acoustical testing environment for each component type that isolates its contribution from the contribution of other components, which may in actual open-plan environments contribute significantly to the overall speech privacy. 5.4 The significance of test results obtained by this test method must also be considered with regard to the attainable measurement accuracy. The attainment of speech privacy in the presence of masking sound is critically dependent upon sound level of the speech relative to the masking sound; a change as small as 2 dB in either the speech or masking sound may change the privacy from significant to insignificant. The normally accepted test accuracies for sound attenuation measurements may be inadequate to evaluate components having marginal interzone attenuation performance for open-office needs.