Weak current College】 【digital broadcast system in the Olympic forest park on the application of the three venues --- Power By】 【China power house network.

<br> In recent years, with large public projects are emerging, digital broadcasting system to its management, flexibility, long-distance transport, extensive, and many other advantages, has been accepted, in particular the opening of the Olympic Games in Beijing, .a large number of new construction of sports facilities, so that the digital broadcasting system once again been widely applied. Among them, three venues of the Olympic forest park zone is a digital broadcasting system for the application of a very typical case. <br> .<br> Olympic forest park is located in the three venues, the Olympic Park, Olympic village, North of the West end, covers an area of huge, Olympic green Tennis Center, archery and hockey, Olympics bear the related events. Although the three .venues district in commitment during competition competitions, but because of its geographical location adjacent to cause its still in operation as a unified regional management. <br> <br> Just a single venue, each venue still occupies a large area, Tennis Center, for .example, it has three large venue, 8 tablets preselection Racetrack and 6 tablets driving range, East of the entire Tennis Center from the West side of security practice range, linear distance of 500 meters above the sea level. At this distance level traditional centralized broadcasting .system is facing a great design bottlenecks. But if you use a decentralized broadcasting system, how to solve each of the regional system of coordination among management and design challenges. Digital broadcasting system a good solution to this conflict. <br> <br> And .traditional analog broadcasting system than digital broadcasting system infrastructure and the nature of the change has occurred, whose main component is still part of the sound source, pre-amplifier, audio processing (toggle) host, power amplifiers, speakers, and other basic components at .the end, but its digital properties make this schema inside a qualitative change in addition to the original function of a single audio processing (toggle) host is replaced by a powerful digital audio matrix, except the power to end the two-level (here refers .to the sound source to the preamplifier and power amplifier to the location of the end of the speaker) other stages of analog audio signal completely to digital communication and audio signals, and through proprietary digital protocol that allows a digital signal can communicate in the LAN. .In the local area network is already very mature today, this framework not only greatly improves single broadcasting system of transmission distance, coverage, or make the original schema single system become more abundant, originally only centralized or decentralized management of large broadcasting system has been completely .change for both decentralized and unified collaborative distributed broadcast system. <br> <br> And other intelligent systems, digital broadcast system by a powerful central processor constitute the core of the entire system. Now generally pop crooner likes to call it digital audio matrix or .digital audio processor, although the traditional broadcasting system, we can see a similar device, but in fact, apart from the schema they are also device shape looks a bit similar, they essentially are two completely different device. The most essential difference is that the .digital audio matrix handled audio resources (either input or output) are in digital form, rather than traditional analog audio signals, which makes it a lot in the past only through compression or gain the functionality of the device to complete, can be in digital audio .matrix via software to complete, so that the system of results become more compact and easier to maintain. When connected to the LAN, the digital features or you can make digital media matrix more like a network node for the computer rather than a distinctive switch, .which makes his workstation can be in any one node of the network, as flexible distributed control administration provides prerequisite. <br> <br> As previously said, even in the digital broadcasting system, the sound source to the preamplifier and power amplifier to the .end of the stage between the sound signal is still analog audio signals, which are often due to a front end audio sources and Terminal speaker device itself restrict the result, therefore, generally speaking, a digital broadcasting system for analog-digital/analog conversion parts .are set in the amplifier side, this is a known interface machine-to-analog/digital conversion device, the interface of the machine usually provides multi-channel audio data input or output, and interface with digital audio matrix, then through a local area .network, a digital audio transmission, broadcasting in the Tennis Centre in system design, digital interface machine was scattered away from the central control room of the weak, to terminal equipment and power amplifier speaker distance from substantially reduced, resulting in lower due excessively long power .signal transmission distance and cause of loss, greatly improves the coverage of the broadcasting system. <br> <br>-If the computer's digital audio matrix of another advantage is that, because the network node, equal to the same network, allows the has .more sets of equipment for digital audio matrix, which makes this system have special need, to form a more flexible system, the entire audio network can form a large system, can also be scattered into several completely independent of the broadcasting system. <br> .<br> In the Tennis Centre of broadcast design, Center Court and no.1 Court is located on a platform known as the No. 1 independent building system, and by the budget of the arenas, platforms, and 2, field 3, the .platform consisting of, the venue for the helped to use, located at 3, a platform 2, stadium individual use of demand, but the entire Tennis Center still constitute the overall broadcasting system. <br> According to this demand, in the Tennis Centre .of broadcasting system that uses two sets of digital audio matrix, is located on the 2nd field (3), digital audio matrix addition can handle 3 platforms of broadcast Division, to the nearest principle has led the West at 3, a platform for various broadcast .radio broadcasting. This makes the entire Tennis Center in broadcast design that is discrete and unify, manage and maintain a good and flexible. <br> <br> In the design of the three venues of the Olympic Park, have encountered another problem is the .venue of life, not all the same problems. In addition to the Olympic green Tennis CenterWill serve as permanent venues remain after the game, archery and hockey are temporary venues, the Olympic Games will be removed. Therefore, in a broadcast system based on Tennis .Center and the other two venues still require different treatment. <br> <br> Digital broadcasting system a good solution to the problem. In the three venues of design, digital broadcasting system "to expand the nature" was interpreted as "the removable nature .". In the actual design, archery and hockey using independent digital audio matrix control, due to distance limitations, both sets of audio matrix system through outdoor optical cable and connected to the central control room in tennis, but the audio matrix communications continues to be .completed within the LAN. After the game, along with archery and hockey's demolition of the overall broadcasting system from three venues broadcast system detached out, in addition to the software for simple configuration outside tennis courts again broadcasting system schema does not have any impact, at .the same time, the original service to archery and hockey equipment can also be used to move it, starting from the economic to the thrifty role makes thrifty Olympics purposes embodied. <br> <br> In addition to the stadium, the digital radio system .for another widely used areas of the airport, both faces with a construction area of wide use and management of complex and diverse conditions, especially in the more remote call station, two more have many similarities. However, relative to the airport, the sports facilities .on the requirements of the remote call station is not very high. Call for more points at the airport, many manufacturers have developed digital broadcasting its own unique phone system, powerful, high reliability, ease of use, it also brings another question, that is .the cost. Single to a partition selection feature of the remote call microphone, for example, its equipment cost (does not take into account the additional cable cost) to tens of thousands of dollars for dollars. Therefore, an important prerequisite to economics to the .design of the Olympic venues, such devices are often designers a wide berth, however, simply call microphone + preamplifier constituted by the remote call station does not have the operation of broadcast partition switching, functional, not for actual use. In the Tennis Centre of .broadcasting system design, we found an economical and viable solution. <br> <br> According to the needs of the use of the tennis, the remote call station typically occurs in the VIP Hall, the players lounge, calling Department positions, such as .during competition, these locations will be set up at the reception desk facilities, in addition to broadcasting features, these facilities are generally both inquiry service, a computer terminal connected to the LAN is often necessary for these service desk. The design of the calling station ., Tennis Center still uses the call receiver + preamplifier, the difference is that in the help desk computer comes pre-loaded with a digital broadcasting system of the client software, the computer can be through a local area network and is connected to the digital audio .matrix, by the permission settings on the software, you can make each call station for limited broadcasting partition switching, so as to achieve a and band switching remote call station proprietary device also features. But the help desk computer with other existing devices in the system ., it may not be incorporated into the budget of the broadcasting system, and do not need to be unique wiring, thereby reaching the effective use of resources and equipment for the purpose of saving. <br> <br> Through these nifty design, you .can make the broadcasting system more optimized and flexible, but in the design of many important details are design work must comply with. <br> <br> Although both control communication or digital audio communication with LAN transmission mode, but their very nature, the .transmission is completely is two things, the digital audio has its own unique Transfer Protocol, is completely different from the network transmission of TCP / IP Protocol, now internationally popular a CobraNet audio transfer protocol to the agreement. Its main characteristics are as follows: < .br> <br>? No digital distortion and audio noise? quantization 20bit, 48kHz sampling frequency <br>-Dynamic range (SNR) 122.16dB <br>? Distortion ≤ 0.000078% (maximum power point) <br>-Frequency response: .+ 0dB/-0.5dB, 20Hz ~ 20kHz <br>? Use Ethernet packets through the network buffering delay is not greater than 5 audio? Ms <br>? A 100Mbit connection can be in each direction transmission audio signal 64, equal to a .stripe Cat6 can transmit 128-channel audio signal, the connection can further increase 1000MBase more road transport to provide a common transmission to control protocol, because the CobraNet is Ethernet network, so that different protocols can be used with the environments, and do not disturb .each other. <br> <br> Although the CobraNet agreement can and other protocols used in the same environment, but due to its non-destructive digital audio transmission, so that they occupy a large amount of network bandwidth, the importance of the use .(in particular broadcasting system combines fire broadcasting feature) also determines the network structure and other system shared not reality. In General, design, audio data transfer network tend to be a separate network, it will not only effectively guarantee the audio bandwidth and ensure its .stability, reliability and security. But for the radio system control communication signal, and the sharing of existing local area network. <br> <br> To sum up, although the digital broadcasting system than traditional analog broadcasting system have great scalability, flexibility, .its functional advantages in large public buildings reflect, however, still in the design shall be based on the needs of the actual use of building it targeted design, can guarantee its usability and affordability of balance between the best. <br>.