Video conferencing system common technical details
A complete set of video conferencing systems is usually composed of videoconferencing terminals, multipoint control unit MCUs, network management software, transport networks and related accessories.
First, the video conference terminal classification type
Video conference terminal is used to encode and package video and audio data, and then sent to the remote through the network, while receiving the remote transmission of data, unpacking, decoding, video and sound signals to restore and output to the peripherals The In short, the video conferencing terminal is a front end device that communicates with the far end during the conference. There are three main video conferencing terminals: desktop, set-top box, conference room type.
- Desktop terminal
Desktop terminals are a powerful combination of powerful desktop or laptop computers with high quality camcorders (built-in or external), ISDN cards or network cards and video conferencing software. It can effectively make people at the desk or people who are traveling to join your meeting, and you face to face communication. Main applications: desktop video conferencing terminals are usually assigned to the office of a special person or a person traveling on a business trip. Although desktop video conferencing terminals support multipoint conferencing (for example, the conference contains more than two conference sites), it is mostly used for point-to-point meetings (such as one-person meetings with another person).
Today, tablet PCs, smart phones and other mobile terminals can be mobile video conferencing terminals by installing specialized applications.
- Set-top box type terminal
Set-top box type terminal is known for simplicity. In a unit contains all the hardware and software, placed on the TV. Easy installation, light equipment. Open video conferencing requires only one regular TV and an ISDN BRI line or LAN connection. The video conferencing terminal can also load some peripheral devices such as document projectors and whiteboard devices to enhance functionality. Main applications: set-top box-type terminals are usually shared resources between departments, from multinational companies to small businesses and other institutions of all sizes. It is often the company to buy the first “conference room type terminal”.
- Conference room type terminal
Conference room terminals offer almost any solution required for video conferencing, generally integrated in a conference room. Conference room terminals typically combine a large number of attachments, such as audio systems, additional cameras, document projectors, and PC collaboration files. Dual screen display, rich communication interface, graphic flow selection makes the terminal a high-end, comprehensive products. The main application: conference room type terminal mainly for large and large enterprises and design.
MCU is the short term of the video control system center control equipment, its full name is Multipoint Control Unit – multi-point control unit, also known as multi-point conference controller, multi-point video conferencing system is the key equipment.
MCU in the video conference is equivalent to a “switch” role, it will be from the meeting site information flow, after the separation of the separation, the extraction of audio, video, data and other information and signaling, and then the meeting site Information and signaling, into the same processing module, complete the corresponding audio mixing or switching, video mixing or switching, data broadcasting and routing, timing and conference control process, and finally the meeting site needs a variety of information Reassemble, sent to the corresponding terminal system equipment.
MCU mainly deal with three types of data:
- The video signal is mainly done by the video processor
- The audio signal is mainly done by the audio processor
- Data signal: mainly by the data processor to complete
In addition, the MCU interface in the network interface module and control processor is also essential. The control processor is primarily responsible for determining the correct routing, mixing or switching of audio, video, data signals, and control of the meeting.
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