Digital infrared language distribution system, also known as infrared simultaneous interpretation system, is a system used in multilingual meetings. In order to help participants understand the contents of the meeting, the system transmits the voice of the mother tongue to the receivers and earphones in the hands of the participants. As infrared is used as the transmission medium, the principle of direct and diffuse reflection of light is used to realize signal coverage of the venue, and the participants can move freely without affecting listening, it is widely used in large, medium and small press conference halls, academic report halls, school halls, various international conference site etc.