Functional Requirements:

Chairman mode: the chairman of the microphone is turned on, the other speaker units are automatically turned off, the chairman microphone turns off the rear has the right to open;

Speech restrictions: can be set to open at the same time 1/3 speak unit, when the number of boot, the system into the application mode;

First-in first-out mode of operation: to reach the number of boot, the first to open the speech unit can be later speech unit closed;