Technology Used By Videoconferencing Systems

Technology used by videoconferencing systems

The video conference system is mainly used to establish a virtual meeting room through the network to meet people's needs across the space boundary and achieve "interviews" in other places. The videoconferencing system is not a single functional system, but a comprehensive application system with more comprehensive functions. Which standard technology should be used in the standard videoconferencing system?

Video display technology

The video display of the video conference system is generally multi-channel real-time display, and the multi-channel video real-time display needs to consume more data processing operations, while the use of the general video display technology is only through the CPU for operation and display, this method can not adapt to many Real-time video display, we should use direct operation display to achieve multi-channel video display.

Data compression technology

The data of the video conference system mainly includes real-time data such as audio and video, and these original data are generally relatively large and have a lot of space and time redundant data. Therefore, we need to eliminate these data through data compression technology. Space and time redundancy. Compressed data can be transmitted with a smaller bandwidth and plays a very important role.

Transmission Protocol Technology

Although UDP protocol can achieve real-time data transmission, it is easily affected by the network environment. Packet loss and delay often occur. Therefore, the video conference transmission protocol cannot use only the TCP or UDP protocol. We can encapsulate the data in the RTP packet. Each RTP packet is encapsulated in a UDP packet and then encapsulated into an IP packet for transmission. Real-time transmission of UDP data is achieved through feedback control of the RTP protocol.

Multicast technology

Multicast technology is a technology for data transmission through multi-address broadcasting, and its sender and receiver are in a one-to-many relationship. In the transmission process, the sender only needs to send the data packet once, and other multiple receivers can receive the data packet at the same time. In videoconferencing system applications, we often need to transmit data from one terminal to each terminal. Therefore, regardless of whether point-to-point communication is repeated or broadcasting is used, network bandwidth is seriously wasted, and multicast technology distributes data transmission to each. Multicast address termination greatly reduces the amount of data in the network.