In the past few years, with the continuous improvement of China's network technology, the application of network video transmission has also taken advantage of such a big situation. So, whether it is the focus on network monitoring, or the application of video conferencing. Also, with the help of the current overall environment, it has moved to the foreground of the application. Especially with the recent increase in remote communication, video conferencing products have also emerged in an endless stream. And the quality of the network is undoubtedly an important prerequisite for giving full play to the characteristics of video surveillance.
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Dissection video wireless transmission
How is wireless HD video transmission technology generated?
Due to the high-definition video conferencing and popularity in modern enterprise video conferencing, people are paying more and more attention to the layout of corporate video conference rooms. The connection between TV, DVD player, projector and audio is often complicated and cumbersome. It is incompatible with the decoration of the video conference room, especially the placement of speakers in the home theater. It is more difficult to deal with the connection between the host and the host.
However, more and more connections between the complex devices required to support high-definition video conferencing are coming, and the Sony LF-W1BR adopting the IEEE802.11b/g wireless LAN transmission standard is not well fully coped. The transmission rate on it is not very high, so the new wireless HD video standard has also begun to brew. Finally, the two major alliances of WirelessHD and WHDI launched a new wireless HD video standard in 2008, which indicates that it will say goodbye to the connection between the various complex devices needed to support high-definition multimedia home theater. However, the new technology and new standards also have its limitations - there is no strong wireless wall penetration capability, which is also compared with the Sony LF-W1BR.
Advantages of wireless HD video transmission technology:
The wireless HD video standards introduced by WirelessHD and WHDI use 60 GHz and 50 GHz respectively. In the transmission process, they are all transmission methods using one-way transmission. For example, a broadcast device such as a Blu-ray player is used for signal transmission; a display device such as a flat-panel TV or a projector is responsible for signal reception. Compared with the IEEE802.11b/g wireless LAN transmission standard adopted by the current popular Sony LF-W1BR, the data transmission rate of the two standards is higher, which is much higher than the 54Mbps of the Sony LF-W1BR, which can meet the 1080P uncompressed. The high-definition video needs wireless transmission, and the current standard can only transmit 1080i high-definition digital signals. However, the transmission distance covered by the Sony LF-W1BR and the high penetration capability of the signal are also desirable for electronic products with new standards.
Since the two standards have a large bandwidth in the transmission process, this feature can display high-quality, high-definition, uncompressed, lossless video, and thus many manufacturers are coveted.
Good product compatibility is also a major advantage of the new wireless HD transmission technology.
The future development of wireless HD video transmission technology憧憬:
With the popularity of high-definition devices such as high-definition flat-panel TVs, high-definition DVD players, and high-definition projectors, the current corporate video conferencing has entered the high-definition era. However, the current wireless technology is also driven by the strong momentum of HD. The emergence of new wireless high-definition transmission technology has led to the emergence of wireless high-definition transmission digital interfaces. The change of interface technology from "real" to "virtual" also indicates that the types of interfaces will be more and more.
The emergence of wireless high-definition transmission technology has mainly solved the connection problem between more and more complex devices required to support high-definition multimedia home theater. With it, the connection cables for various video conferences can be omitted. This makes its HD video conferencing products a huge potential demand for some time to come.
How to choose wired transmission?
Then, face the "very personal" video conferencing equipment in our hands. How can we set up our network more specifically to better exploit the advantages of our video conferencing system? Below, we will come to know the current network construction mode commonly used in video conferencing systems, according to their respective Features, choose a better information transmission "highway" for our video conferencing system.
More "reliable" DDN line
Whether it is network monitoring or video conferencing, the biggest problem for us is the malice of the network environment. It is precisely because of the limitation of network bandwidth that the popularity of network monitoring has always been difficult to develop with the technology of network equipment, showing a proportional growth trend. Therefore, in order to solve this problem, the main solution for the current large-scale network video transmission is to rent a dedicated DDN line to solve its own remote transmission problem.
For the transmission mode of DDN, it has the characteristics of high transmission quality, small network delay, high circuit reliability, high network security, and convenient networking. Therefore, under the service of the private network, the user can enjoy a smoother, more efficient and more specific network transmission service. Of course, the biggest drawback of this type of application is the high cost. Therefore, it is also more suitable for large enterprises or urban management video conferencing or network monitoring applications.
Video quality guaranteed ATM network
In addition to the DDN network line mentioned above, if you want to solve high-quality video transmission in the needs of the big environment. ATM network is also a good communication transmission solution.
Perhaps most users don't know much about this kind of transmission. The ATM transmission mode is also called asynchronous transmission mode. It basically combines the advantages of circuit switching and packet switching, so that it can arbitrarily transmit wideband signals at various rates, including voice, image or simple data. The biggest feature of this technology is that it has the technical guarantee of QoS, which has a good play on line conditions and video quality. Even with DDN, it has even better transmission capabilities. Therefore, for users with high image quality requirements, ATM transmission is undoubtedly the best choice.
More popular ISDN
For the construction of the two transmission systems mentioned above, it is more likely to be a large-scale unit application with a large amount of money. For our ordinary small and medium users, it is still far away from us. So what is the transmission mode for our application? ISDN is obviously one of our good choices.
For most users, the most common and most commonly used ISDN is undoubtedly our economical and practical choice. Since ISDN uses the public telephone network to provide end-to-end digital channels for users to connect, it has great advantages in terms of generality and convenience. In addition, in terms of transmission efficiency, its rate can reach 384 kb to 2 mb. Therefore, in terms of bandwidth capacity, it is possible to adapt to more transmission applications. In addition, the cost of transmission is also very low. Therefore, it can be said that it is a very close communication means.
Although ISDN may not be able to maintain long-term stability in terms of network stability and reliability, it has been able to solve our demand for civilian video transmission well in applications.
Small and medium-sized choice: IP network
If you give each technology the "most", perhaps ISDN is the most common, then the simplest is the application of IP network systems.
In general, IP-based systems use molecular switching technology, because packet switching is difficult to guarantee orderly retention and fixed delay, so there is still a certain lack of stability. However, in order to better improve the real-time performance of data transmission, IP networks use protocols such as UDP/IP, RTP, RTCP, and RSVP. The video conferencing system applied to broadband IP networks such as ADSL and FTTB+LAN has achieved good results.
Especially in today's ubiquitous IP network, this kind of networking is convenient and cheap, and it can be recognized by more users. Although its communication transmission is far less than that of ISDN, DDN and other private networks, its performance is sufficient for small and medium-sized users with more common needs.
The above is the transmission mode of some network monitoring or video conferencing that we often use. They have their own characteristics for different needs. This will make our network video transmission more smooth. Of course, for our users, the advanced network is like a good vision, it only shows that we have a good transmission base. As for how to maximize our transmission advantages, I am afraid we need to understand and grasp our system and needs.
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