Electroacoustics - Audio-frequency induction loop systems for assisted hearing - Part 1: Methods of measuring and specifying the performance of system components— 42 стр.
Electroacoustics. Audio-frequency induction loop systems for assisted hearing. Methods of measuring and specifying the performance of system components— 32 стр.
Fire detection and fire alarm systems for buildings, Code of practice for the design, installation, commissioning and maintenance of emergency voice communication systems— 72 стр.
Electroacoustics - Hearing aids - Part 4: Induction-loop systems for hearing aid purposes - System performance requirements (IEC 60118-4:2014); German version EN 60118-4:2015— 56 стр.