The infrared transmission system designed for 4-channel simultaneous interpretation in the 2-6MHz frequency band. GONSIN TC-904 IR language distribution system is designed to offer 4-channel audio distribution using the advanced infrared transmission technology. As the central element of the system, the infrared transmitter interfaces with conference system, connects interpreter consoles and infrared radiators which transmit audio signals to wireless multi-channel receivers for the delegates to hear the language of their choice via personal headphones. The system operates in the higher 2 to 6 MHz frequency band which is immune to distortion from hall lighting andfree from radio frequency interference, ideally suited for use in business and government conferences, international conventions and other multilingual applications.