EN ISO 389-7-2005 声学.校正听力设备的基准零级.第7部分:在自由场所和非扩散场所听力条件下听力基准阈值 ISO 389-7-2005
Acoustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under freefield and diffuse-field listening conditions (Incorporates Amendment A1: 2016)