decodes the infrared signal and coverts it back to an audio signal which is sent to the headphone.

In a multichannel system the transmitter generates a carrier wave for each channel. All the modulated carrier waves are mixed, and are fed via a coaxial cable from the transmitter to the infrared emitters. The output of the emitters is modulated infrared light, which is invisible to the human eye. Each user is given their own pocket receiver. This receiver has a lens which collects the infrared light, and directs it to an IR sensitive receptor. he receiver has electronics to decode the received signals, and to output one of the signals (selected by a channel selector) to the headphone connector.

In a conference or theater setting the transmitter can be placed anywhere within about 1,000 feet of the radiators. The radiators need to be placed around the area to be covered by a technician with knowledge about the dispersion pattern of the emitter and the power output. These radiators are connected in a daisy chain configuration around the hall to give adequate signal strength to the entire area to be covered. Additional emitters may be placed back stage or in over flow rooms as the signal will not travel through walls.

Advantages
The of an infrared transmission system are fully realized when different programs are required in adjacent rooms, such as a multiplex cinema or conference center. Each room can be equipped with a separate infrared system without interference between rooms. In the case of a multichannel transmission system, a delegate can go from room to room and keep the same channel for their particular language. Additionally, since the signal is transmitted via infrared light there is little change of radio frequency interference.

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