该SAE标准源自SAE J2805，规定了测量M类和N类道路车辆在静止和低速运行条件下发出的声音的工程方法。本规范再现了与行人安全相关的静止和低速车辆运行条件一致的主要车辆声源产生的声级。该方法旨在满足简单性的要求，只要它们与车辆操作条件下结果的再现性一致。 该测试方法要求的声学环境只能在广阔的开放空间或复制广阔的开放空间条件的特殊设计的室内设施中获得。这种情况通常存在于:用于监管认证的车辆测量。 制造阶段的测量。 在官方测试站进行测量。 通过该方法获得的结果给出了在规定的测试条件下发出的声音的客观测量。需要考虑的事实是，对不同机动车辆或机动车辆类别由于其声音发射而引起的恼人性、可感知性和/或可检测性的主观评估不仅仅与声音测量系统的指示相关。由于烦恼、可感知性和/或可检测性与个人人类感知、人类生理状况、文化和环境状况密切相关，因此存在很大的变化，因此这些术语不能用作描述特定车辆状况的参数。在理想的声学环境中，很少会对随机选择的车辆进行抽查。如果在不满足本SAE标准中规定的要求的声学环境中在道路上进行测量，所获得的结果可能会明显偏离使用规定条件获得的结果。 此外，该标准提供了一种工程方法来评估外部声音产生系统的性能，这些外部声音产生系统旨在向行人提供有关车辆运行状况的声学信息。该信息被报告为与外部发声系统的声压级、频率含量以及声压级和频率含量随车速的变化相关的客观标准。因此，这些措施可以向行人提供关于车辆的位置、速度、行进方向、加速和减速行为的信息。附录A包含与本SAE标准制定相关的背景信息。

This SAE Standard is derived from SAE J2805 and specifies an engineering method for measuring the sound emitted by M and N category road vehicles at standstill and low speed operating conditions. The specifications reproduce the level of sound which is generated by the principal vehicle sound sources consistent with stationary and low speed vehicle operating conditions relevant for pedestrian safety. The method is designed to meet the requirements of simplicity as far as they are consistent with reproducibility of results under the operating conditions of the vehicle. The test method requires an acoustic environment which is only obtained in an extensive open space or in special designed indoor facilities replicating the conditions of an extensive open space. Such conditions usually exist during: Measurements of vehicles for regulatory certification. Measurements at the manufacturing stage. Measurements at official testing stations. The results obtained by this method give an objective measure of the sound emitted under the specified conditions of test. It is necessary to consider the fact that the subjective appraisal of the annoyance, perceptibility, and/or detectability of different motor vehicles or classes of motor vehicles due to their sound emission are not simply related to the indications of a sound measurement system. As annoyance, perceptibility, and/or detectability are strongly related to personal human perception, physiological human condition, culture, and environmental conditions, there are large variations and therefore these terms are not useful as parameters to describe a specific vehicle condition. Spot checks of vehicles chosen at random rarely occur in an ideal acoustic environment. If measurements are carried out on the road in an acoustic environment which does not fulfill the requirements stated in this SAE Standard, the results obtained may deviate appreciably from the results obtained using the specified conditions. In addition, this standard provides an engineering method to assess the performance of external sound generation systems intended for the purpose of providing acoustic information to pedestrians on a vehicle’s operating condition. This information is reported as objective criteria related to the external sound generation system’s sound pressure level, frequency content, and changes in sound pressure level and frequency content as a function of vehicle speed. As such, these measures can provide pedestrians with information on the location, speed, direction of travel, acceleration, and deceleration behavior of a vehicle. Annex A contains background information relevant in the development of this SAE Standard.