DIN EN 62489-1:2015 电声学.助听用音频电磁感应环路系统.第1部分:系统组件性能的具体说明及测量方法(IEC 62489-1-2010+A1-2014).德文版本EN 62489-1-2010+A1-2015
Electroacoustics - Audio-frequency induction loop systems for assisted hearing - Part 1: Methods of measuring and specifying the performance of system components (IEC 62489-1:2010 + A1:2014); German version EN 62489-1:2010 + A1:2015