(Qinhuangdao City First Middle School)
First, the design idea of ??IP digital broadcasting system
1.1 The design idea is strictly in accordance with GJ/T16-92 "Code for Design of Civil Building Electrical Appliances" (excerpt) as the design basis, combined with your needs, using the best design to reflect the highest performance-price ratio, so that the system's functions and indicators reach domestic The first column of the same type of system is our overall design idea. Specifically embodied in the following aspects:
(a) Advancement and scalability:
The development of modern information technology, new products, new technologies emerge one after another. Therefore, the system should make full use of the latest modern technology in the case of investment costs, so that the system can adapt to social development in the longest possible time. However, due to the rapid development of modern science and technology, it is necessary to fully consider the future development needs, and the design must be forward-looking and scalable. This scalability not only fully protects Party A's investment, but also has a high overall performance price ratio. This design has fully considered this, pre-buried the necessary pipelines, and reserved various interfaces, which is very convenient for system expansion and upgrade.
(b) Scientific and normative:
Unlike the general audio system, the IP digital broadcasting system is an advanced and complex comprehensive system engineering. It must start from the system design, including construction, installation, commissioning, and final acceptance, all in strict accordance with relevant national standards and norms. Good system standardization design and scientific management. Finally, submit a formal test and acceptance report and a full set of construction drawings and technical materials for Party A to file. In particular, as a government grant project, it must be ensured that the entire project can withstand the rigorous tests of all aspects and for a long time.
The main specifications of the implementation include:
1.GBJ-89 "Technical Specifications for Civil Building Cable TV System Engineering"
2.GJ/T16-92 "Code for Design of Civil Building Electrical Appliances"
3.GB 50168-92 "Electrical Installation Engineering Cable Line Construction Acceptance Specification"
4.GB 50254-96 "Code for Construction Acceptance of Low-voltage Electrical Apparatus for Installation of Electrical Installations"
5.JGJ/T16-92 "Code for Electrical Design of Civil Construction"
(c) Safety and reliability:
The construction of IP digital broadcasting system directly affects the user's use effect, external image and return on investment. Therefore, the system design must be safe and reliable. This solution has fully considered the use of mature technology and products in equipment selection and system design. Minimize the occurrence of failures. From the aspects of line laying, equipment installation, system commissioning and technical training for personnel of Party A, the reliability requirements must be met. It is particularly important that all the key equipment selected in this scheme have obtained the authorization certificate of the manufacturer or agent of the equipment, and promise to give full support in the provision of engineering equipment, technical support and after-sales service. This is one of the key conditions for the key assessment of international and domestic engineering bidding projects.
(d) Sound quality optimization:
The core of the sound quality design. In order to achieve this goal, the selection of equipment is the first condition. We have selected Gaobaozheng products here, and cooperate with advanced and reasonable system design to ensure the optimization of sound quality.
This design is based on the requirements of Party A, comprehensively absorbs the advanced technology of the current domestic fire protection system, and is designed into a modern IP digital broadcasting system with advanced equipment, elegant style, beautiful sound quality and complete functions. The main equipments are equipped with brand-name products to ensure superb performance indicators, while the auxiliary equipment uses imported or domestic reliable brands to appropriately reduce the cost. Using our theoretical and practical experience in system engineering design and construction for many years, we carefully combine to ensure excellent performance and reliable quality.
When designing the IP digital broadcasting system engineering project, we strictly follow the specific technical requirements of the IP digital broadcasting system engineering project in the bidding documents, and refer to the relevant national acoustic standards, and carry out IP according to the actual situation of the site and the functional requirements. The design and equipment configuration of the digital broadcasting system make the system design technical standard specification, equipment standard specification and engineering standard specification fully comply with relevant national regulations and norms.
1.2 Selection principle
1. Scientific, accurate and advanced system design:
When designing the IP digital broadcasting system, the acoustic technical indicators of these venues are guaranteed to meet the requirements specified in the bidding documents, so that the sound system design of each venue is scientific, accurate and advanced.
2. Systematic and practical to meet functional requirements:
In the equipment configuration of the IP digital broadcasting system, we guarantee that the system should have the ability and level to complete the functions required by the project, meet the actual needs of the project and the requirements of relevant domestic regulations, and it is easy to implement and easy to operate.
The equipment indicators selected by the IP digital broadcasting system meet the requirements, and are consistent and interchangeable, so that the system has good flexibility, compatibility, scalability and portability.
3. Equipment reliability and service guarantee:
We design the main equipment OBT-PA professional products in IP digital broadcasting system with high reliability and excellent performance. It has been successfully applied in domestic and won high praise. At the same time, OBT-PA professional products are promised to all users in the country. 1 year of free warranty, and establish a comprehensive technical service network in all parts of the country to provide timely and effective services to customers.
4. Economical configuration of the system:
We always follow the principle of performance and price ratio of equipment selected by IP digital broadcasting system to ensure the high efficiency and practicability of IP digital broadcasting system configuration.
1.3 Manufacturing Company Profile Shenzhen Oub Technology Co., Ltd. is a high-tech industrial public broadcasting manufacturer integrating R&D, production and sales. Headquartered in the forefront of China's southern economy and technology ------ Shenzhen. Since its establishment in 1999, the company has been adhering to the business philosophy of continuous innovation and creating value for customers. It has made great progress in the development, production and sales of IP digital broadcasting system equipment, and has established and established a good reputation in the public broadcasting industry. Image brand -------OBT. In the 1990s, the company assembled a group of outstanding domestic and international sound engineering experts, using today's international and domestic advanced and mature computing software and hardware technology, so that products can be adapted to the future technological development changes and business development needs. The product adopts strict ISO9001 quality control system from four aspects of design, option, production and quality inspection. OBT-PA series IP digital broadcasting system is widely used in parks, plazas, intelligent communities, intelligent buildings, hotels, factories, rural areas, banks and other places, and is trusted by users.
The system uses embedded computer technology to transmit digital audio signals through a mature TCP/IP network, making full use of the existing cutting-edge technology, making the system suitable for social development in the longest possible time. The DNA network audio system uses the TCP/IP protocol family that has become the international standard for data communication facts as the standard for network data communication and management; the Ethernet network is used as the access method for terminal devices, and the Ethernet network currently occupies the network access mode. 90% of the international market. The audio data is analog-to-digital and becomes a digital audio stream. The stream transmission uses OBTTP/OBTTCP real-time transmission protocol and real-time transmission control protocol. These protocols are also the IEEE's recommended standard for easy interconnection with third-party products. . Each digital audio stream occupies a network bandwidth of no more than 90 KBP/s; this value for the current mainstream network is almost negligible.
As a man-machine interface, TFT uses a multi-level graphical menu to realize the function setting, query and running status monitoring of the broadcasting device. The image is convenient and can support multiple languages. The central control function can also be performed excellently in an IP digital broadcasting system with moderate control complexity. Provide users with maximum system scalability.
The controller software is compiled in windows to ensure the modularity and structure of the program. The controller software of all devices adopts a unified software structure, and different functional modules are prepared according to different functions, which is easy to test and maintain the product.
We are guided by the customer first, quality-oriented, service first, extensive cooperation and pioneering spirit. Today, with the rapid development of new technologies, we will provide newer and better technology products and serve our customers. We believe that OBT-PA public broadcasting products must be your best choice.
Second, IP digital broadcasting overview
Voice broadcasting is the most direct, original and effective tool for human communication. Broadcasting systems are widely used in areas such as recreation, hazard warning, emergency command, and information release. However, from a technical point of view, most of the current broadcast system implementations are based on traditional analog electronic technology, and the limitations of the analog technology itself limit the application of the broadcast system. Since the beginning of the 21st century, digital technology and computer network technology have developed rapidly; the information construction of all walks of life has become increasingly popular, and the "network" has flooded most of people's lives. The combination of data, voice and video has become a recognized mainstream direction. The transfer of analog broadcasting systems to network and digital is also the trend of the times.
Traditional analog broadcasting systems generally use audio or frequency modulation. Audio broadcasting is affected by factors such as voltage, power, and impedance. The transmission distance is short, the frequency is low, and it is susceptible to interference, and the system has poor scalability. FM broadcasting introduces noise into the modem, and device aging and frequency offset can also cause signal distortion. In recent years, it has also developed a kind of intelligent broadcasting (or digital broadcasting, controllable partition broadcasting, etc., which is complicated and confusing), but its transmission method is still based on audio or frequency modulation, but only in the front end of the broadcasting system plus computer host control. For simple partitioning and grouping. Different computer host controllers may also come with simple timed playback. The intelligent broadcasting system also embodies two points of "intelligence": one is partitioning and the other is computer control. A more deadly weakness of the intelligent broadcasting system is the poor scalability of the network. In order to ensure the quality of the broadcasting system, intelligent broadcasting needs to carefully calculate the power matching and signal interference of each partition during design. Once it is determined, it is difficult to change, and the user invests. Not guaranteed. As enterprises and institutions become larger and larger, analog broadcasting systems are increasingly difficult to meet user requirements.
The IP digital broadcasting system relies on the IP network to transmit data streams, and the IP digital broadcasting system can cover as long as the IP network can cover the place. According to experience, once IP network technology can be introduced into a system, it will inevitably bring about a drastic change to the system.
The daily operation of the IP network into enterprises and institutions has gone through a long process, and IP digital broadcasting has not appeared, and its roots are as follows:
1) The reliability of the IP network infrastructure platform. The inherent characteristics of the broadcasting system have caused the application of broadcasting to be extremely different: either often or rarely. For the former, the broadcasting system is generally used for leisure entertainment and information release; while for the latter, the broadcasting system is generally used for dangerous alarm and emergency command. In both cases, the broadcast system is highly reliable. In the early days of its development, IP networks gave the impression that IP networks were unreliable. There are two root causes of unreliable IP networks. One is that network bandwidth is not guaranteed, and the other is the stability of network devices. Relying on the efforts of the industry and the development of technology, IP networks have become more and more worthy of users' trust. At present, a full Gigabit IP network is built, the cost is very low, and the bandwidth limitation does not exist in practical applications. The stability of network equipment has greatly exceeded the psychological expectations of general users, military command, finance and taxation, and basic communication. Systems such as e-government that require absolute high reliability have successfully operated on IP networks. The realistic conclusion is that the current IP network can fully carry a digital broadcasting system.
2), VoIP (Voice oveOBT IP) technology is more difficult. The voice service is a service with high real-time requirements. Firstly, the delay of voice transmission on the network must be within the scope of the license, and the voice is encoded and decoded without distortion. In general, VoIP technology is only in the hands of a few large communication equipment vendors. It is difficult for ordinary broadcasters to master the VoIP core technology, and the completed IP digital broadcasting system is difficult to reach a practical level.
In general, specific technical problems will always be broken and mastered, and having a stable and reliable IP network infrastructure platform will not be achieved overnight. Fortunately, these two major problems are now being eliminated, and efficient, practical and powerful IP digital broadcasting systems have emerged.
OBTPA IP all-digital audio system can transmit distances from every information point in the world. As long as the network arrives, the number of IP terminal hosts can be increased arbitrarily. The number is unlimited. Locally, the signal can be transmitted through the LAN, and the remote signal can be Passing through the Internet, that is, adding a terminal or host to the system simply connects the information point to the device that needs to be added (just like adding a computer to an Internet cafe), it is as simple as that!
Compared to other digital audio systems, the system is a peer-to-peer system. Each terminal host can send audio data and management commands to any other terminal host or host (server) in the system, and any host or terminal can be started. Stopping will not affect the normal operation of other terminals or hosts in the system.
The system is also a PNP (Plug and Play) compliant device that can quickly work with other devices in the system if a new terminal or host device is connected to the system. At any terminal with a display device, you can see the operating status of other terminals and can easily turn it off, which greatly reduces the maintenance cost of the user.
The overall goal of informatization construction is to build an information-based system with information sharing, resource integration, centralized management and good service based on the principle of first-class planning, first-class design, first-class construction and first-class quality. OBTPA IP Network Broadcasting makes full use of multiple information technologies to create multi-level, innovative and open demonstration projects.
Third, analog broadcast, intelligent broadcast, addressable broadcast system structure
3.1 Traditional Broadcasting System Architecture No matter how complicated the traditional broadcasting system can be classified into the above, the difference is basically concentrated on the cross-capacity of the partition matrix and the intelligence of the timing player. The entire system relies on analog audio current drive, which is poor in scalability and controllability.
3.2 IP digital broadcasting system structure:
The IP digital broadcasting system uses analog technology only on both sides of the voice source and the speaker horn, and the transmission platform of the entire system is based on the IP local area network. The system main control server and voice decoding terminal all have independent IP addresses, and communicate using standard TCP/IP protocol.