What is the meaning of video conferencing MCU ah?

MCU (Multi-point Control Unit) is the key equipment in the video conferencing system, its role is to image, voice, data signals for switching, and it is the data stream for switching, and not like the telephone exchange for analog signal switching. MCU on the video signal using direct distribution, if a venue has a speaker, his image signal will be passed to the MCU, MCU will be switched to all the venues it is connected to. For data signals, the MCU uses broadcasting to switch the data from one venue to and from other venues. For voice signals can be divided into two cases: if only one venue to speak, the MCU will be switched to all other venues; if at the same time there are several venues to speak, the MCU will be mixed with their audio signals, pick out the highest level of audio signals, and then switched to the venue in addition to the venue of all other venues.