1.1 该分类的目的是提供一种计算单个数值额定值的方法，该方法可用于评估建筑物提供的室外声音隔离度，或比较建筑物立面样本，包括墙壁、门、窗及其组合，包括完整结构。这些评级旨在与建筑构件减少包含强低频声音的室外地面和空中交通噪声渗透能力的主观印象相关联。 2. 这些评级根据试样在控制称为参考源频谱的特定室外声谱的声音方面的有效性，对试样的性能进行评估和排序。 1.2 除了计算方法外，该分类还提供了ASTM标准中其他地方未定义的室外-室内传输等级的定义。其他标准，如指南 E966 根据本分类方法定义附加评级，本分类中讨论了其中一种。 1.3 评级不一定与传输声音的感知美学质量相关。具有相似额定值的不同立面元件在其传输的低频和高频声音的比例上存在显著差异，并且声源的频谱可能存在显著差异。最好使用特定的声音传输损耗值，结合室外和室内声级的实际频谱，最终选择立面元素。 1.4 本分类范围不包括涉及噪声频谱的应用，这些应用与中所示的噪声频谱明显不同 表1 因此，例如，排除了某些工业噪声，这些噪声在80 Hz三分之一倍频带以下的频率下具有较高的电平，相对于较高频率下的电平，以及没有频谱sim的任何源，包括某些运输源 表1 然而，对于频谱类似于 表1 ，与其他分类（如分类）相比，此分类提供了更可靠的分区和立面元素性能排名 E413 . 1.5 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前建立适当的安全、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====== 4.1 该分类为已测量或计算的传输损耗或噪声降低数据提供了单个数字评级。该评级基于中给出的声谱的总A加权声级之间的差异 表1 以及从该频谱中算术地减去传输损耗或噪声降低数据而得到的频谱的总A加权声级。频谱形状是来自运输来源（飞机起飞、道路交通和内燃机车）的三个频谱的平均值。一项研究表明，这一分类与为每个单独频谱计算的A加权和响度降低（基于当时有效的ISO 532:1975）有很好的相关性，用于确定50 Hz至5000 Hz三分之一倍频程范围的评级。额定值的计算数值是基于某个微粒的声音传输损耗或降噪值 中显示的值 表1 具有任意参考电平。小心使用单个数字额定值。具有相同额定值的试样可根据其传输损耗随频率的变化产生不同的室内光谱。此外，如果室外声音的实际频谱不同于 表1 总的A加权室外-室内噪声降低可以不同于OINIC。频谱中的强低频成分 表1 意味着达到高额定值的试样必须具有较强的低频传输损耗。将此分类与中的频谱一起使用 表1 在源没有类似频谱的情况下: 表1 可能导致对低频传输损耗的要求高于应用所需的要求。可能发生这种情况的例子包括第3阶段喷气式飞机、以轮胎噪声为主的高速高速公路、紧急车辆警报器和以h为主的火车通行 6. 4.2 该分类要求在80至4000 Hz的三分之一倍频程范围内，室外-室内传输等级（OITC）的声传输损耗（TL）、室外-室内噪声隔离等级（OINIC（θ））的室外-室内降噪（OINR（θ）），或基于该分类的其他等级的等级定义的其他数据。 4.3 由于试验方法中给出的精度限制 E90 和向导 E966 （与封闭测量空间的体积有关），在制定本分类之前，未报告100 Hz三分之一倍频带以下的测量。研究表明，80 Hz三分之一倍频程的数据对于获得交通声源的可接受相关性是必要的。测试方法 E90 （当测试立面元素或外部门或窗时）和指南 E966 现在需要报告80Hz三分之一倍频程频带中的数据。就本分类而言，此类数据被视为具有可接受的准确性。 4.4 声音传输损耗的低频测量可能受试样尺寸或试样边缘约束或两者的影响，尤其是对于门或窗等小型模块化试样。因此，室外-室内传输等级（OITC）也可能受到这些因素的影响，导致使用该分类的额定值的组件的现场性能存在一定的不确定性，但不知道其程度。

1.1 The purpose of this classification is to provide a method to calculate single-number ratings that can be used for assessing the isolation from outdoor sound provided by a building or comparing building facade specimens including walls, doors, windows, and combinations thereof, including complete structures. These ratings are designed to correlate with subjective impressions of the ability of building elements to reduce the penetration of outdoor ground and air transportation noise that contains strong low-frequency sound. 2 These ratings provide an evaluation and rank ordering of the performance of test specimens based on their effectiveness at controlling the sound of a specific outdoor sound spectrum called the reference source spectrum. 1.2 In addition to the calculation method, this classification provides the definition of the outdoor-indoor transmission class which is not defined elsewhere within ASTM standards. Other standards such as Guide E966 define additional ratings based on the method of this classification, one of which is discussed in this classification. 1.3 The rating does not necessarily relate to the perceived aesthetic quality of the transmitted sound. Different facade elements with similar ratings differ significantly in the proportion of low and high frequency sound that they transmit, and the spectra of sources can vary significantly. It is best to use specific sound transmission loss values, in conjunction with actual spectra of outdoor and indoor sound levels, for making final selections of facade elements. 1.4 Excluded from the scope of this classification are applications involving noise spectra differing markedly from that shown in Table 1 . Thus excluded, for example, would be certain industrial noises with high levels at frequencies below the 80 Hz one-third octave band, relative to levels at higher frequencies, and any source, including some transportation sources, that does not have a spectrum similar to that in Table 1 . However, for any source with a spectrum similar to that in Table 1 , this classification provides a more reliable ranking of the performance of partitions and facade elements than do other classifications such as Classification E413 . 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 ====== 4.1 This classification provides a single number rating for transmission loss or noise reduction data that have been measured or calculated. This rating is based on the difference between the overall A-weighted sound level of the sound spectrum given in Table 1 and the overall A-weighted sound level of the spectrum that results from arithmetically subtracting the transmission loss or noise reduction data from this spectrum. The spectrum shape is an average of three spectra from transportation sources (aircraft takeoff, road traffic, and diesel locomotive). A study showed that this classification correlated well with the A-weighted and loudness reductions (based on ISO 532:1975 in effect at the time) calculated for each of the individual spectra used in developing the rating for the one-third-octave band range of 50 Hz to 5000 Hz. The calculated numeric value of the rating is based on the sound transmission loss or noise reduction values for a particular specimen and depends only on that data and the shape of the reference source spectrum used in the calculation. The values shown in Table 1 have an arbitrary reference level. Use single-number ratings with caution. Specimens having the same rating can result in different indoor spectra depending on the variation of their transmission loss with frequency. Also, if the actual spectrum of the outdoor sound is different from that assumed in Table 1 , the overall A-weighted outdoor-indoor noise reduction can be different from the OINIC. The strong low-frequency content of the spectrum in Table 1 means that specimen achieving a high rating must have strong low-frequency transmission loss. Use of this classification with the spectrum in Table 1 in situations where the source does not have a spectrum similar to Table 1 could result in requirements for more low-frequency transmission loss than is necessary for the application. Examples where this can occur are stage 3 jet aircraft, high-speed freeways with sound dominated by tire noise, emergency vehicle sirens, and train passes with sound dominated by horns. 6 4.2 This classification requires data in one-third octave bands from 80 to 4000 Hz of sound transmission loss (TL) for outdoor-indoor transmission class (OITC), outdoor-indoor noise reduction (OINR(θ)) for outdoor-indoor noise isolation class (OINIC(θ)), or other data based on the rating definition for other ratings based on this classification. 4.3 Due to accuracy limitations given in Test Method E90 and Guide E966 (related to the volume of enclosed measurement spaces), measurements below the 100 Hz one-third-octave band were not reported prior to the development of this classification. Studies have shown that data in the 80 Hz one-third octave band are necessary to obtain acceptable correlations for transportation sound sources. Test Method E90 (when testing façade elements or exterior doors or windows) and Guide E966 now require the reporting of data in the 80 Hz one-third-octave band. For the purposes of this classification, such data are deemed to be of acceptable accuracy. 4.4 The low frequency measurements of sound transmission loss can be affected by the test specimen size or the specimen edge restraints, or both, particularly for small modular specimens such as doors or windows. Consequently, the outdoor-indoor transmission class (OITC) can also be affected by these factors, resulting in some uncertainty of the field performance of assemblies bearing a rating number using this classification, but to what extent is unknown.