声学 护听器 第1部分:声衰减测量的主观法

[中文适用范围]： 本文件规定了测量听力保护器在听力阈值处的声音衰减的主观方法。 该方法是一种实验室方法，旨在在受控测量条件下产生可重复的值。 这些值仅在用户以与测试对象相同的方式佩戴设备的情况下反映听力保护器的衰减特性。 为了获得更具代表性的现场性能指示，可以使用 ISO/TS 4869-5 的方法。 该测试方法产生的数据是在低声压级（接近听力阈值）下收集的，但也代表了听力保护器在较高声压级下的衰减值。 例外情况发生在振幅敏感听力保护器的声压级高于其与级相关的特性生效的点的情况下。 在这些声压级下，本文件中指定的方法不适用，因为它通常会低估这些设备的声音衰减。 注：由于在闭耳测试中屏蔽了生理噪声，500 Hz 以下的声音衰减可能会被高估几个分贝。 [外文原描述]： This document specifies a subjective method for measuring sound attenuation of hearing protectors at the threshold of hearing. The method is a laboratory method designed to yield reproducible values under controlled measurement conditions. The values reflect the attenuating characteristics of the hearing protector only to the extent that users wear the device in the same manner as did the test subjects. For a more representative indication of field performance the methods of ISO/TS 4869‑5 can be used. This test method yields data which are collected at low sound pressure levels (close to the threshold of hearing) but which are also representative of the attenuation values of hearing protectors at higher sound pressure levels. An exception occurs in the case of amplitude-sensitive hearing protectors for sound pressure levels above the point at which their level-dependent characteristics become effective. At those sound pressure levels the method specified in this document is inapplicable, as it will usually underestimate sound attenuation for these devices. NOTE Due to masking from physiological noise in the occluded ear tests, sound attenuations below 500 Hz can be overestimated by a few decibels.