Transmission of audio and/or video and related signals using infra-red radiation - Part 1: General (IEC 61603-1:1997); German version EN 61603-1:1997— 17 стр.
Transmission of audio and/or video and related signals using infra-red radiation - Part 3: Transmission systems for audio signals for conference and similar systems (IEC 61603-3:1997); German version EN 61603-3:1998— 10 стр.