Short definition
A multi-channel system transmits several audio channels simultaneously – for example, different interpreting languages – to conference participants' receivers.
Detailed explanation
When six languages are spoken at a conference, participants need the ability to receive exactly the channel that carries their language. The multi-channel system makes this possible: it distributes several independent audio channels simultaneously over a transmission system – usually via infrared or radio.
Each channel corresponds to an interpreting language or the original audio. Participants' receiver devices – small pocket units with a headphone jack – let them select the desired channel via a dial or button. At an eight-language conference, channels 1 through 8 are available, plus usually one channel for the original audio.
A system's channel capacity is limited and must be factored into planning. Infrared systems offer different channel counts depending on the manufacturer – professional systems support up to 32 channels or more. With very many languages, multiple parallel systems are sometimes used.
Relevance in this subject area
The multi-channel system is the technical prerequisite for any multilingual event with simultaneous interpreting. Without it, there's no structured language reception for participants.
Practical example
At a European association congress with eight working languages, 400 receiver devices are distributed. Each participant selects their language channel via a slide switch – the original audio runs on channel 0, the interpreting languages on channels 1 through 7.
Related terms
Infrared system, Interpreting system, Simultaneous interpreting system, Receiver, Transmission technology