DIN EN ISO 389-7-2006 声学.测听设备校准用的参考零点.第7部分:自由场和扩散场听力条件下的参考听觉阈
Acoustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions (ISO 389-7:2005); English version of DIN EN ISO 389-7:2006-04