1. School profile and functional requirements Nantong University is located in Nantong City, Jiangsu Province, a coastal open city known as the "Pearl of the Sea" and "Famous Historical and Cultural City". It is a comprehensive university jointly established by the People's Government of Jiangsu Province and the Ministry of Transport. At present, the school has 5 national specialty construction sites, 20 Jiangsu province brand majors, and Jiangsu province specialty majors. It has national teaching teams, national teaching achievement awards, national quality courses, national quality teaching materials, and national experimental teaching demonstrations. A batch of high-quality teaching resources represented by the Center and Jiangsu Higher Education Teaching Achievement Award. Nantong University has now become a local comprehensive university with a reasonable scale and structure, complete disciplines, excellent teaching quality, and obvious school-run benefits. This campus broadcasting system design has three campuses: Nantong University main campus, Qixiu campus and Zhongxiu campus. ◆ Requirements for the construction of campus radio system in Nantong University 1. General control center of campus broadcasting system The Nantong University Broadcasting System Control Center is located on the main campus and is planned with the school campus TV system control center. 2. The campus broadcasting system includes one main system and two sub-systems The broadcasting system of Nantong University is composed of the main system of the main campus, the Qixiu campus and the Zhongxiu campus division system. The main control centers of each sub-system are located in the main control room of the broadcasting system of each campus. 3. The main functions of the campus broadcasting system The main campus broadcasting system of Nantong University can not only fully realize all the functions of the traditional campus broadcasting system, but also realize: such as multi-channel partition broadcasting, campus network live broadcasting or on-demand broadcasting, and fixed-point broadcasting 3. The live situation of the conference; the remote placement of the broadcasting room and the general control room; the sub-system sound source to the whole system), etc. 4. The main campus broadcasting system framework The main campus broadcasting system is one of the subsystems of the broadcasting system of Nantong University. The main campus broadcasting system is equipped with a general control center on the fifth floor of the Fang Zhaozhou teaching building (same room as the TV system general control center). The broadcasting room is located in the Youth League Committee, and can be easily relocated and adjusted to other branch control points (for example: in the second canteen building). According to the distribution of campus buildings, multiple sub-control centers can be set up, and the sub-control centers are generally set up in the network room of this sub-region. The entire broadcasting system is a networked system with centralized control and management. 5. Step-by-step implementation of Nantong University ’s broadcasting system ①The Qixiu school division system and the Zhongxiu school division system temporarily use the original public broadcasting equipment, and at the same time add the interoperable equipment with the main campus. ②The main campus broadcasting system is currently the key construction project. The system uses a networked broadcast system, using the existing local area network and achieving multi-network integration, reducing construction wiring. Full digital transmission, covering the main campus and two branch campuses. ③ The general control center of the broadcast system can broadcast the same or different broadcast content to the two subsystems at the same time. ④The general control center of the broadcasting system can choose the content of any sub-system to play in other sub-systems. (Synchronized with TV system) ⑤ The audio source of the broadcast system can be broadcast live on the campus network, collected and compressed in real time, and stored on the server for on-demand on the campus network. The school's major events can be broadcast live or on-demand in the main campus and two branch campus systems. ⑥Each building of the main campus and the two branch campuses are used as a small partition, and all buildings can be arbitrarily combined or controlled as a whole in the broadcast center. In order to meet the different requirements of different departments, each sub-system can play different content at the same time for different areas of the system. At least 8 sub-control centers can be set up (authorization of sub-control can be authorized by the main control center). ⑦The background music outside the campus is required to be divided into fixed sections, which can be listened to the same source at the same time, or broadcast separately. ⑧ Break through the traditional public broadcast can only download and centralized control by the computer room, with interactive functions, the terminal has on-demand and control and wireless remote control functions. 2. Design Basis of University IP Network Broadcasting System The design of university digital network broadcasting system mainly refers to the following relevant standards and industry specifications: ◆ Design specification for automatic fire alarm. GBJ116-88 ◆ Chinese electrical equipment installation engineering construction and acceptance specifications. GBJ / 232-92 ◆ Basic environmental testing rules for electrical and electronic products. GB2421 / 22 / 23.1 / 23.2 ◆ Calculation method of language clarity index. GB / T15485 ◆ Measurement method of audio amplifier. GB9001-88 ◆ Microphone measurement method. GB9401-88 ◆ The main performance measurement method of microphone. GB9396-88 ◆ The safety of information technology equipment including electrical equipment. GB4943-95 ◆ Measuring method of basic characteristics of mixer. GB9003 ◆ Optimal electrical connection method for interconnection of hall sound reinforcement system equipment SS2112-82 ◆ Public broadcasting project cost budget preparation method ◆ Electrical design specifications for civil buildings. JGJ / 16-92 ◆ Communication design specifications for industrial enterprises. GBJ42-81 ◆ Fire protection specifications for building design. GBJ16-37 ◆ Guidelines for lightning protection of electronic equipment. GB7450-87 3. Design Principles of University IP Network Broadcasting System This solution is based on the principle of user supremacy, and meets the needs of users to the greatest extent under the premise of complying with national regulations. In the spirit of advanced technology, high efficiency and convenience, and reasonable investment, it is our overall design idea to reflect the highest performance-price ratio with the best design scheme and make the system's functions and indicators reach the advanced ranks of similar domestic systems. It is embodied in the following aspects: 1. Advancement This system selects advanced, practical technology and products with perfect functions, first-class equipment, and is moderately advanced in technology. The entire system reflects the development level of today's broadcasting technology and is in line with future development trends. It can maintain its technological leading position for a long period of time in the future. 2. Maturity and practicality Each subsystem should use advanced, used, mature and reliable products, and at the same time have practicality, and give full play to the functions and functions of each equipment. This system can fully meet the requirements of convenient operation, simple maintenance and easy management. 3. Flexibility and openness On the basis of meeting the current requirements of the owners, facing the 21st century, the system should be open and compatible, and can be interconnected and interoperable with future expansion equipment. 4. Integration and scalability The system design fully considers the integration of the campus broadcasting system and other fire protection systems to ensure the advancement, rationality, scalability and compatibility of the overall system structure. The use of different manufacturers and different types of advanced products enables the entire system to follow The development and progress of technology are constantly being enriched and improved. 5. Standardization and modularization Strictly follow the relevant national and regional standards for system design and equipment configuration, and structure and standardize the system according to the requirements of the overall structure of the system to comprehensively reflect the advanced technology of today's world. 6. Serviceability and convenience In order to meet the functional needs of the campus broadcasting system, the system adopted should fully reflect the safety, advanced, reliable, convenient and efficient of all aspects of the system managers and users. 7. Economic rationality Equipment selection and system design should ensure that the needs of users are met, with technological advancement, feasibility, and practicality, discard the "bubble" attached to it, and achieve an optimized design that integrates function and economy. 8. Security and reliability The construction of the campus 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 technologies and products, and tried as much as possible in equipment selection and system design. Reduce the occurrence of failures, and must meet the reliability requirements from the aspects of line laying, equipment installation, system commissioning, and technical training for Party A personnel. Combining the above principles and fully satisfying the school's requirements for the campus broadcasting system, this system adopts the Golden Mai digital IP network digital broadcasting system to ensure excellent performance and reliable quality, so as to meet all school requirements for campus broadcasting / emergency broadcasting. 4. Scheme design 1. Overall system construction goals At present, the overall goal of campus information construction is to build a campus information broadcasting system with information sharing, resource integration, centralized management, and good service based on the principles of first-class planning, first-class design, first-class construction, and first-class quality. This campus digital IP network broadcast system construction fully utilizes modern computer software engineering, TCP / IP network, automatic control, voice codec and other information technologies to promote the integration of multiple networks and establish a multi-level, innovative and open model school Under the guidance of new teaching concepts and management theories, it goes beyond the traditional education model and improves the comprehensive quality and efficiency of running schools. With the progress of modern city construction today, modern buildings are rapidly developing toward large-scale and comprehensive directions. The management of large-scale building broadcast audio systems has become more and more complex, and the requirements for system functions and reliability are becoming higher and higher. The system is mainly based on the ringing and broadcasting of large campuses and the playback of various background music on campus. Depending on the actual venue, different speakers are used to cover the entire teaching function area and the campus sound field. The main system and sub-systems of digital IP network broadcasting of Nantong University are mainly composed of four parts: sound source part, control part, transmission part and reception part. The main broadcast control center of the main campus is set in the Fang Zhaozhou teaching building of the main campus. 2. Design of the Broadcast Control Center of the Fang Zhaozhou Teaching Building in the main campus ※ System sound source design The quality of the audio source determines the overall playback effect of the campus. The audio source of the digital network broadcasting system of Nantong University uses: computer (system server host), high-quality DVD player, touch-type dual deck, digital tuner, broadcast microphone, etc. ①Digital sound source design The digital audio source is the audio signal output by the computer. It plays the digital audio files in the computer, including MP3, WAV, MIDI and other audio formats. The characteristic of the digital audio source is that it can be automatically broadcast at regular intervals. The universal application of the school has gradually increased the demand for automatic broadcasting of music. Music ringtones, English listening training and exams are inseparable from the demand for automatic broadcasting. Therefore, we designed a digital sound source for the broadcasting system of Nantong University. Among them, the system server host is used for digital voice file playback, and at least 512 channels of programs can be played at the same time when a 100M network card is configured. ②Analog audio source design DVD player: DVD is the most commonly used analog audio source in schools. It is mainly used to play educational teaching discs. The DVD design of this system adopts Jinmai Video GM-8621T. This product has been awarded the National Educational Technology Association of China Educational Technology Association for three consecutive years. Top Ten Brands of Radio and Television Equipment. Double deck: The deck is mainly used for playing various English teaching tapes. To ensure the quality, the deck adopts Jinmai Video professional deck, model GM-8622S. Tuner (AM / FM radio): used to listen to and broadcast the English listening test content of radio stations, and important news, model: GMTD-8620T. Broadcast microphone: used for the principal's speech, the speeches of the teachers in charge, broadcasting announcements, holding parent meetings, etc., designing a microphone for the school; the model is BK-240. Audio source online live broadcast, on-demand and other functions: the audio source of the broadcast system and the live events of major events in the school can be broadcast live on the broadcast system and campus network. After being collected and compressed in real time, it is stored on the server and available for on-demand campus campus. ※ System control part design ①System server management software function: 1) The digital IP network broadcast server management software system includes the system main control software package and the client software package, and the number of client software package installations is not limited. The software system can manage and control each broadcast terminal, and can also realize networked broadcast management, remote real-time acquisition and broadcast, remote course schedule management, audio courseware editing and production, remote maintenance of server audio program library, remote monitoring of broadcast content, remote adjustment Volume and other functions. 2) The system can be set to automatically turn on or off the power of the main control device, used for teaching multiple sets of rest time 24 hours a day programming (accurate to seconds), according to the week to perform music ringtones (wake up number, class bells), morning Radio gymnastics, flag-raising, inter-class exercises, eye exercises, extra-curricular entertainment Listen to the indoor and outdoor all or partition of the radio program, according to the need to set different ringtones and campus songs every day. The ringtones can be automatically partitioned, and the volume of each area (point) can be adjusted freely. For example, you can put a bed number in the dormitory in the morning, and ring the bell to and from the teaching area between classes. You can choose the foreign language teaching of the classroom. Student test listening test, free software partitioning, arbitrary combination between multiple classes, scheduled automatic playback of programs for voice teaching and voice listening test or training, terminals in the classroom all have audio signal input ports, which can be connected to wireless microphones on site The computer is used for teaching activities, and the terminal also has a local sound reinforcement function (such as: the teacher uses a laptop computer in class, the sound card output volume is small, and it can be amplified to meet the listening requirements of teaching). 3) Multi-point control is realized, and the computer room system equipment can be controlled at any time without being in the control room. As long as the main system is not in operation, each broadcast branch can be used independently without interference. Students (authorization required) can set up broadcasts and other cultural programs through the server or the branch control point. There is no regional restriction on the use of the branch control point, which is convenient and flexible. . The system has good scalability, and the terminal or control system can be added or removed at any location within the original system without adding host equipment and repeating wiring. ②Sub-control station: The sub-control station is an inevitable feature of the university's digital IP network broadcasting system. The sub-control point can be any desktop or laptop computer, running remote client software. The branch control point can control the broadcasting system through the login and authorization verification of the system server. Through the remote client, users can use the sound card of the client computer for real-time broadcast, and the content can be real-time speech or live mixing. The remote client can also play local files, and can schedule scheduled playback tasks remotely, upload to the server and wait for the server to automatically play. The system administrator can also manage and monitor the entire broadcast system through the remote client, and can adjust the volume of the broadcast information point in real time. 1) Leadership sub-control system: The system can authorize multiple sub-stations or remote workstations. Leaders do not need to go to a special broadcast center, only need to use the office computer to use the microphone to the whole school or any grade, class, teacher within the scope of authority The office conducts remote paging, meetings, lectures, etc. 2) Teacher sub-control system: 1. It can establish long-distance timing tasks and conduct English listening training. 2. Remote point-to-point speech. 3. Can remotely control the output volume of the device. 4. Unlimited partition broadcasting can be performed on the device. 5. Capable of collecting English tapes in real time for English listening test. 3) Student broadcasting station: responsible for the school's broadcasting and publicity work. Publicize and report on the school ’s major activities, fully reflect the campus life, enrich the extracurricular life of teachers and students, and improve the campus cultural atmosphere. The main area is the campus outdoor and playground area. ③Real-time sowing function Using real-time acquisition and broadcasting software, the programs of other audio sources are collected and compressed in real time to the server, and simultaneously broadcast to the designated terminal. The broadcast source can be the IP network terminal GM-8003D, other commercial or personal radio stations, decks, CD players, MP3 players, microphones, etc. A digital IP network paging terminal GM-8003D is installed in each lecture hall. ④ Courseware making function Can convert any media file with audio into 128K bit rate MP3; can locate and analyze audio files, merge; can record audio files (128K bit rate MP3) ※ System transmission part The broadcast master control center, sub-control and receiving terminals are connected by campus LAN, WAN or INTERNET network, and audio signals and control signals are transmitted in two-way network through TCP / IP protocol in a digital format. At present, the transmission requirement of the university digital network broadcasting system is 128Kbps. The construction of the Nantong University campus network has reached the requirement of 10M / 100M network, which can fully meet the transmission rate requirements of the university IP digital network broadcasting, and can ensure the reliability and stability of the broadcast signal and the voice signal. Clear. ※ System receiving part There are three ways to receive digital IP network broadcast reception on the campus of Nantong University. One is to directly receive and listen with network speakers, and the other is to use digital IP network broadcast terminals to receive and demodulate the audio signal and send it to a given resistance speaker for listening. The digital IP network (on-demand) terminal receives and demodulates it, and then sends it to the power amplifier to convert it into a constant-pressure broadcast signal, and listens to the broadcast with a ceiling speaker, outdoor rainproof sound column or lawn speaker. 3. Audio transmission design of lecture halls and broadcasting rooms of the main campus and branch campus of Nantong University ※ Transmit using network digital IP broadcast terminal Since the design of the university's network broadcast system is based on the TCP / IP architecture, audio collection, playback management, and remote calls can all be distributed over the network without geographical restrictions. In view of the fact that the current school broadcasting room and campus broadcasting master control room need to be relocated to facilitate the leadership of speech management, our company designed and developed the IP network broadcast paging terminal GM-8003D, its working principle: the audio signal is converted into by the GM-8003D terminal audio acquisition processing The digital signal is transmitted to the server through the network, the server broadcast system software is used for real-time broadcast, and real-time directional broadcast can be set. Audio files can be stored in the designated directory for backup, for live broadcast or on demand on other campuses. This method is simple and flexible, with no construction volume and low cost. If you need to relocate and adjust, you only need to modify the IP address of the terminal. Therefore, what we designed for Nantong University is to use the digital IP network paging terminal GM-8003D to realize the live campus network live broadcast or on-demand live broadcast of major school events and conferences. 4. Project design of the lecture hall and university student activity center of No. 9 teaching building of Fang Zhaozhou on the main campus We designed and installed GM-8003D in the lecture hall of Building 9 and the lecture hall of the University Student Activity Center. Its functions are as follows: ①When activities are held in the lecture hall of Building No. 9, such as lectures and meetings, etc .; the live speech of the lecture hall can be uploaded to the server through GM-8003D for live broadcast or on-demand on the main campus and the other two campuses. ②GM-8003D has LCD display, which can operate the server's music library, such as on-demand songs. ③GM-8003D has a cross-Internet function, under the authorization of the broadcast server, it can control the designated terminals of the other two campuses, and broadcast the notified or broadcast content to the designated area. 5. Equipment design of the broadcasting room of the Fang Zhaozhou teaching building campus of the main campus Students are a special group, and the utilization rate of the broadcasting system in the broadcasting room is very high; operation errors are relatively common. For this situation, we design and install a digital IP network paging terminal GM-8003D for the broadcasting room, in order to prevent The server has been misused, resulting in the impact of the system's abnormal use on the system. Students equipped with the GM-8003D terminal can only operate the hardware. The terminal has an LCD screen and an operation keyboard for easy use. 6. Scheme design of each branch control center of Fang Zhaozhou teaching building in the main campus ※ Partition design of the network broadcasting system of the Fang Zhaozhou teaching building in the main campus Zoning design: digital IP network terminal GM-8004 We design and install a digital network rack terminal GM-8004 for each partition to meet the requirements of any combination of system partitions. The system has a total of 10 partitions (Western District Subsystem, One Canteen Subsystem, North District 1 Subsystem, Northwest Subsystem) System, South 2 subsystem, South 1 subsystem, Ershitang subsystem, North 2 subsystem, Northeast subsystem, Southwest subsystem). In addition, considering the expansion of other campuses in the future, a total of 12 digital IP network rack terminals GM-8004 need to be designed. The function of each partition: under the authorization of the main control center, it can play their own programs at the same time; each partition is set up in any group according to the main control center; it accepts the broadcast control broadcast command of the digital IP network paging terminal GM-8003D. ※ Design of speakers and amplifiers of the network broadcasting system of the Fang Zhaozhou teaching building in the main campus ①Monitor speaker design: digital network speaker GM-8001 We designed and installed a pair of GM-8001 for the school in the main control room. Its function is to facilitate the user to monitor the working status of the remote terminal, such as: setting the speaker IP to the IP of the C segment network segment can monitor the local speaker playback The types of tracks and the volume of local speakers. ② Speakers are designed for student apartments, cafeteria, outdoor lawn area and leisure activity area. Outdoor speaker design: Student apartments and canteens: The student apartments and canteens are designed and installed with outdoor rainproof sound columns, and the number of speakers is designed according to the outdoor area. The models are: GM-418 or GM-628 outdoor sound columns. Campus greenbelt: In addition to the usual bells for playing classes, extracurricular club activities, and broadcast announcements, the greenbelt part also requires manual broadcast speech. The sound of the broadcast system is required to be clear and bright, and must be very good for music and vocals. Good analytical reduction. In addition, the outdoor area is relatively open and open, so the choice of speakers must have a good frequency response range and sufficient power. Here we have designed and installed Jinmai for the school based on the field visit to Nantong University. Video GM-200 series lawn speaker. There are more than 60 styles of this series of lawn speakers with a power between 10-30W; and the speakers have a wide frequency response, beautiful sound quality, and beautiful shapes that are in harmony with the campus environment. ③ Design of power amplifier: The power amplifier is a very important device in the broadcast system, which directly affects the stability of the system and the quality of the broadcast sound. Therefore, in addition to the power loss of the terminal speaker, we also consider the loss of the line and other equipment when configuring the power amplifier, and The system also has redundant power to ensure the stability of the system. The general equipment principle is about 1.5 times greater than the actual power. ④ System wiring: The campus broadcasting system is connected by network cable or optical fiber. Different zones are connected to the broadcast center through the network, and the bus mode is used in the same zone. Use high-quality special wire to minimize the power attenuation caused by the line. ⑤ In areas where the power supply voltage is unstable, it is recommended to use a UPS regulated power supply, which can ensure a stable power supply to the system, avoiding the system from operating abnormally or damaging the equipment due to the unstable voltage, affecting the normal use of the school. ※ Nantong University Qixiu Campus and Zhongxiu Campus Broadcasting Control System Design The Qixiu School Distinction System and the Zhongxiu School Distinction System temporarily use the original broadcasting equipment, and at the same time, add separate control workstations and the main campus to link and interoperate with digital IP network terminal equipment. 5. Advantages and characteristics of university IP network broadcasting system 1. Digital transmission: The university digital network broadcast adopts a unique CD-quality data file format, and transmits the broadcast microphone, deck, radio head, audio network server, and sub-control host audio in a digital format to each network broadcast receiving terminal through TCP / IP protocol This method of full digital transmission avoids the attenuation of audio signals and the addition of noise, ensuring high-fidelity audio playback. 2. Personalization of the terminal: University digital network broadcasting is based on WAN, LAN or INTERNET. Each network broadcasting terminal can have a unique independent IP address in the network to which it can play different music at the same time. The maximum number of broadcast programs can reach 255 sets, which fully meets the needs of universities. Digital network broadcasting. 3. Front-end networking: University digital network broadcasting extends the front-end audio source to the entire network, and the scheduled broadcast of programs can be operated remotely through the network. Networked management can also set different permissions for different users. 4. Play automation: University digital network broadcasting can realize automatic broadcast, and specify the broadcast time for each program, the server will automatically play, and the content and target range can be arbitrarily specified. 5. Humanized operation: University digital network broadcasting provides the school with a humanized graphical menu interface and humanized operation, which is easy and convenient, specific and practical, and improves the efficiency of use. 6. Application intelligence: University digital network broadcasting has many intelligent designs, which can realize voice functions such as recording, variable speed, and list loop playback during the broadcast process; it can also implement timing settings and automatic broadcast playback; and can be remotely scheduled, maintained, and managed. 7. Simplify the project: The university digital network broadcasting project is simple. For each IP broadcast point in the existing local area network, only the network broadcasting adapter needs to be installed. If the network is not built, the amount of data network engineering is relatively simple. You only need to lay the network cable. Construction, the broadcast system and the computer network system can be shared, reducing the repeated construction of multiple networks. 8. Zero maintenance of the system: University digital network broadcasting is physically shared with the network, so no additional maintenance work is added to the network maintenance. In terms of application, the system can be set up to separate the network segment from the computer system, and the embedded system program of each network broadcast adapter is solidified and will not be infected by viruses. The system is stable and reliable, and there is basically no maintenance work. 6. System Topology
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Example Analysis of IP Network Broadcasting System of Nantong University