1.1 本试验方法涵盖了建筑隔墙的空气传播声损失的实验室测量，如各种墙壁、可操作隔墙、地板-天花板组件、门、窗、屋顶、面板和其他空间划分元件。 1.2 实验室的设计是为了使试样构成两个试验室之间的主要声音传输路径，因此在试验室中存在近似漫射的声场。 1.3 实验室认证-- 中给出了认证实验室执行该测试方法的要求 附件A4 . 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 术语中定义的声音传输损耗 C634 ，是指暴露在扩散入射声场中的试样的响应，这是该实验室测试方法所接近的测试条件。因此，试验结果与暴露在类似声场中的类似试样的性能最直接相关。然而，它们为分区或元件通常可能暴露于的各种声场提供了有用的通用性能度量。 5.2 在为满足本试验方法要求而设计的实验室中，其目的是使房间之间的声音传播的唯一重要路径是通过试样。在通常有许多其他声音路径的建筑中，情况并非如此-- 侧面声音传输 因此，使用该试验方法获得的声音等级与建筑物中的声音隔离没有直接关系；它们代表了现场测试中测量值的上限。 5.3 此试验方法不适用于现场试验。应根据试验方法进行现场试验 E336 . 注2: 使用试验方法测量的可比数量 E336 由于侧面声音传输的存在而被称为表观声音传输损失。

1.1 This test method covers the laboratory measurement of airborne sound transmission loss of building partitions such as walls of all kinds, operable partitions, floor-ceiling assemblies, doors, windows, roofs, panels, and other space-dividing elements. 1.2 Laboratories are designed so the test specimen constitutes the primary sound transmission path between the two test rooms and so approximately diffuse sound fields exist in the rooms. 1.3 Laboratory Accreditation— The requirements for accrediting a laboratory for performing this test method are given in Annex A4 . 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 Sound transmission loss as defined in Terminology C634 , refers to the response of specimens exposed to a diffuse incident sound field, and this is the test condition approached by this laboratory test method. The test results are therefore most directly relevant to the performance of similar specimens exposed to similar sound fields. They provide, however, a useful general measure of performance for the variety of sound fields to which a partition or element may typically be exposed. 5.2 In laboratories designed to satisfy the requirements of this test method, the intent is that only significant path for sound transmission between the rooms is through the test specimen. This is not generally the case in buildings where there are often many other paths for sounds— flanking sound transmission . Consequently sound ratings obtained using this test method do not relate directly to sound isolation in buildings; they represent an upper limit to what would be measured in a field test. 5.3 This test method is not intended for field tests. Field tests shall be performed according to Test Method E336 . Note 2: The comparable quantity measured using Test Method E336 is called the apparent sound transmission loss because of the presence of flanking sound transmission.