GMTD digital network campus broadcasting system successfully applied to Beijing City College
I. Project introduction
Beijing City College is a comprehensive general college approved by the Ministry of Education. It has the qualifications for postgraduate and undergraduate degrees recognized by the state. The school also holds specialized higher vocational education, foreign student education, and adult continuing education.
Founded in 1984, Beijing City College is the first new university in New China to implement a public-owned private system. It is known for its pragmatism and innovation and is regarded as a banner for China's higher education reform. The school implements the concept of “Education for All, Education for All, Effective Education, Practical Educationâ€, and strives to create high-level universities and create high-quality talents.
The school has worked hard and made unremitting efforts. It has become a school with Zhongguancun, Aerospace City, University City, Shunyi and other campuses. It has more than 100 majors in science, grammar, finance, art, foreign languages, management, medicine and other disciplines. Full-time students More than 20,000 people, more than 1,500 teachers.
Second, customer needs
Digital campus radio and audio charging, design location: ordinary classroom, joint classroom, experimental classroom, teaching building, administrative building, dormitory building, restaurant building, art building, wind and rain playground, standard sports field, campus main road and green space; Modern school management, campus broadcasting, high-quality English listening, multimedia teaching and other functions; can achieve centralized and unified management, but also can achieve decentralized independent broadcasting.
Classroom rooms require on-demand functions, design points of about 163 points, all need to achieve wireless on-demand function; also have a major activity backup function, network and constant pressure dual backup to ensure the protection of hearing activities;
All kinds of functional building corridors, restaurants and dormitory staff intensive activity areas require regional remote management according to different buildings, and each area can realize independent broadcasting management functions; main control can be unified control; speaker selection and scene environment are integrated Different style speakers such as wall-mounted and ceiling-mounted are available. The design point is: 480;
Campus sports grounds, campus main roads and green spaces require the use of artificial speakers, high-power rain-proof wall-mounted sound columns, requiring sound coverage without dead ends, beautiful sound quality, active campus culture, and large-scale cultural and sports activities. The design point is: 74;
Third, the program design
1. IP broadcast management main control room: adopt GMTD IP network management host GM-8008B, through GM-8008B IP network multi-level architecture management platform for unified management. In this system, we design a buffered IP speaker for full operation. Campus audio monitoring, convenient for management personnel; at the same time, access CD media player GM-8621T, digital tuner GM-8620T, professional-level conference microphone GM-240 to achieve rich program broadcast mode; after digital mixer GM -U8 handles sound quality to provide maximum sound processing for campus radio broadcasts;
2. IP Broadcasting Control Center: For the actual application of customers, there are many campus departments at the same time, and it is compatible with multi-level application requirements such as security, management and teaching. We have designed 14 sets of broadcasting sub-control stations GM-8003D; the overall campus broadcasting system It can be divided into ten levels of authority management, powerful equipment research and development strength, and perfectly reflects the management mode of “autonomous†and “concentratedâ€;
3. Classroom design: The design of the classroom part focuses on teaching applications, so the emphasis on audio-on-demand and sound quality is emphasized in the design. The selected IP terminal is GM-8018. The terminal has the functions of local input, wireless on-demand, and hearing backup. At the same time, the classroom speaker is equipped with GM-8001A wooden speaker. This speaker has high vocal reduction and is specially designed for listening test. a high-fidelity speaker;
4, functional area design: for function walk corridor, sports field, campus green space, etc., we choose: ceiling speaker GM-513; wall mount speaker GM-356; rain sound column GM-418/628; landscape speaker GM-2 series To meet the requirements of different fields for sound and sound pressure level; configure the corresponding IP rack terminal and constant voltage power amplifier; each difference has local playback function; the overall campus is divided into 25 management areas;
Fourth, the system features:
The GMTD digital IP network broadcasting system provides different control and management application interfaces for different places, and realizes the rich application functions of the broadcasting system. Compared with the traditional analog broadcasting system, the system is more in line with the development trend of information digitization. It is the concrete embodiment of information digitization in practical applications.
1) Personalized timed playback
Each digital network terminal of the GMTD network broadcasting system has a separate IP address, and each can individually receive a personalized timed broadcast program of the server. The sub-workstation can set the timed play operation on the Internet through the office computer, or directly through the on-demand keyboard of the terminal.
2) Terminal audio on demand
The real-time on-demand function of the GMTD network broadcasting system enables the staff to communicate with the server in real time at the sub-work site to realize interaction. The on-demand keyboard of the work site provides a personalized Chinese LCD display operation menu interface to assist the staff in flexible control operations.
3) Webcast
The GMTD webcast system supports leading online speaking functions. Leaders do not need to go to a dedicated broadcasting center, and they need to go through the office computer to realize remote speaking through the GM8003 intercom terminal. You can speak to the whole region or you can speak to the optional region. It can also be used for intercommunication with the IP terminal of the sub-control point.
4) Voice live broadcast
The real-time broadcast function of the program of the GMTD network broadcast system can compress and store the programs from other sound sources in real time and store them to the server, and simultaneously broadcast them to the designated terminal. The source of the broadcast can be other commercial or self-use radios, decks, CD players, MP3 players, microphones, and the like.
5) Background music
The GMTD network terminal uses hardware audio decoding and has automatic error correction. The high-fidelity sound balance ensures that the decoded and restored audio signal has CD quality, which has exactly the same effect as the digital music output from the computer. Through the system settings, background music with unattended, multiple set times, and different tracks can be realized.
6) Broadcast monitoring
The system plays the content, and the administrator or the leader can monitor the content of each program broadcasted by the system in real time to understand the broadcast status of the program.
7) Emergency alarm
The system usually plays music. When there is an emergency broadcast request, the system immediately switches to the emergency broadcast state to perform emergency broadcast on the area that needs to be broadcast. At the same time, the system has an alarm linkage function. When there is an alarm, the local alarm will be automatically notified. Each control network point automatically alarms the area according to the scope of the impact and the size of the hazard, improving the efficiency of evacuation and reducing the degree of loss.
8) Constant pressure backup
When there are important activities, the constant pressure and the IP network broadcast complement each other and can be used as backups of each other. Ensure that hearing activities are carried out normally.
Five, system topology
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