本标准规定了基于实验室的测量、分析和报告程序 听力保护器的被动降噪能力。这些程序包括心理物理 在人类受试者身上进行的测试，以确定在听阈下测得的实际耳衰减。 提供了两种拟合程序:方法A）经过培训的受试者拟合，旨在描述能力 在由经过仔细培训的用户安装的设备中，方法B）没有经验的受试者安装，使用受试者 在听力保护的使用方面几乎没有经验，或者根本没有经验 实际职业研究中报告的用户群体可以达到的衰减。 无论用户的磨损程度如何，测试方法都是有效的 以与测试期间相同的方式安装设备。本标准不涉及与以下方面有关的问题: 应用听力保护器衰减值的计算方案或评级系统（参见 ANSI/ASA S12。68），也没有规定听力保护器的最低性能值或地址 舒适性或可穿戴性特征。本标准的方法A符合ISO 4869-1:1990《声学》- 听力保护器第1部分:声音衰减测量的主观方法 B对应于ISO/TS 4869-5:2006，声学听力保护器-第5部分:估算方法 由没有经验的受试者使用拟合来降低噪音。

This standard specifies laboratory-based procedures for measuring, analyzing, and reporting the passive noise-reducing capabilities of hearing protectors. The procedures consist of psychophysical tests conducted on human subjects to determine the real-ear attenuation measured at hearing threshold. Two fitting procedures are provided: Method A) trained-subject fit, intended to describe the capabilities of the devices fitted by carefully trained users, and Method B) inexperienced-subject fit, utilizes subjects with little or no experience with respect to the use of hearing protection, in order to approximate the attenuation that can be attained by groups of users as reported in real-world occupational studies. Regardless of test method, the attenuation data will be valid only to the extent that the users wear the devices in the same manner as during the tests. This standard does not address issues pertaining to computational schemes or rating systems for applying hearing protector attenuation values (see ANSI/ASA S12.68), nor does it specify minimum performance values for hearing protectors, or address comfort or wearability features. Method A of this standard corresponds to ISO 4869-1:1990,Acoustics — Hearing protectors — Part 1: Subjective method for the measurement of sound attenuation, and Method B corresponds to ISO/TS 4869-5:2006,Acoustics—Hearing protectors — Part 5: Method for estimation of noise reduction using fitting by inexperienced test subjects.