标准编号：ISO 4869-6:2019
中文名称：声学 听力保护器 第6部分：有源降噪耳罩声衰减的测定
英文名称：Acoustics — Hearing protectors — Part 6: Determination of sound attenuation of active noise reduction earmuffs
发布日期：2019-02
标准范围
This document is concerned with active noise reduction (ANR) earmuffs. It specifies the test methods
for the determination of the active insertion loss and calculation procedures for deriving the total
attenuation. For this aim, the values of sound attenuation in the passive mode also have to be known
and are determined according to ISO 4869-1. These methods are intended for steady noise exposures
and are not applicable to noises containing impulsive components.
The test methods account for the acoustical interaction between the wearer and the device using
measurements of passive (REAT) and active microphone-in-real-ear (MIRE) measurements as specified
in ISO 4869-1 and ISO 11904-1, respectively.
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