| 摘要 |
PURPOSE: A device for controlling real-time transmission of a multimedia network is provided to connects a main controller(server) and student controllers(clients) in a bus structure, to use transmission receiving with one transmission line, to be operated only by hardware without installing software, and to transmits high density video and audio in real time. CONSTITUTION: A device for controlling real-time transmission of a multimedia network, comprises a main controller(2) and a student controller(3). Between a main controller and a student controller, and between student controllers are connected in a bus structure by using a dedicated multimedia signal transmission cable(5). The signal transmission cable has a specific impedance of 74 ohm to interface with a monitor and a VGA card, and is composed of 25 including power and control lines. A terminator(4) removes a reflection signal in end edge of the transmission cable(5). A video amplifier amplifies high density. A student can select a teacher screen through a switch of the student controller. One video signal, received from between a teacher computer connected to a main controller(2) and a student controller(3), is selected and scanned through a switch. Many student computers are grouped, and the pre-registered group button is used without many buttons when selecting many computers. And the device has a calling function for a student to connect to a teacher(the main controller) for a question.
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