DIN EN ISO 389-7:2020-06
声学 听力测量设备校准的参考零 第7部分:自由场和扩散场听音条件下的参考听力阈值
Acoustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions (ISO 389-7:2019); German version EN ISO 389-7:2019 / Note: DIN EN ISO 389-7 (2017-0...