I. School Profile and Basic Requirements

A university has 5 national specialty construction sites, 20 provincial brand specialties, specialties, national teaching teams, national teaching achievement awards, national exquisite courses, national excellent teaching materials, national experimental teaching demonstration centers, and provincial higher education institutions. The education and teaching achievements award represented a group of high-quality teaching resources. The university has now become a local comprehensive university with a reasonable scale, a complete range of disciplines, excellent teaching quality, and obvious benefits for running a school. At present, there are 16 teaching and function buildings in the school. The length of the north-south trunk road is 1500 meters, and the playground is a standard 400 meters playground. The school campus broadcasting system design campus area is composed of three parts: the activity area outside the building, the main road area, and the sports field area;

1. Campus Broadcasting System General Control Center: The University Broadcasting System Control Center is located in the main teaching building, and is in charge of planning with the School Campus Television System Control Center.

2. Campus Broadcasting System includes a campus radio station;

3. The main functions of the campus broadcasting system: In terms of function, the main campus broadcasting system of the university not only can fully realize all the functions of the traditional campus broadcasting system, but also can achieve: such as multi-zone broadcasting, campus radio broadcasting, and sports venues for large-scale activities. .

4. Broadcasting System Framework: The broadcasting system is one of the sub-systems of the University's weak current system. Set up a general control center on the fifth floor of the main teaching building (with the TV system master control center in the same room). The broadcasting studio is located in the Youth League Committee and can be easily relocated to other sub-control points. According to the distribution of campus buildings, multiple sub-control centers can be set up. Sub-control centers are generally set up in the network room of the sub-region. The entire broadcasting system is a set of centralized control and management networking systems.

Second, the program design

IP network broadcasting has become a common construction method for campus broadcasting systems, especially in universities, because universities occupy much larger areas than primary and secondary schools in terms of building structure, and campus networks of universities have been spread all over the world. . The campus network broadcasting system built on the campus network has advantages over other broadcasting methods in both scientific and economical aspects. Therefore, at the beginning of design, we first followed the principle of “advanced application, economical and practical, safe and reliable, mature and stable, and powerful. "The principle of cost-effective", and comprehensive consideration of construction, maintenance and other important factors, but also for the school's future development, expansion, transformation, etc. to leave room. The overall campus broadcast design is systematic, complete, and comprehensive. The system can fully meet the requirements of convenient operation, simple maintenance, and easy management. The design plan is scientific, reasonable and practical.

1. General design: The overall system of campus broadcasting is designed for network transmission, ie network broadcasting system.

1.1 The design of technical solutions covers: design of broadcast master control room, campus broadcast radio stations, management areas outside the building, campus trunk coverage, and sports field area design.

1.2 Master Control Station: The broadcast server is mainly responsible for ringing, autoplay, and overall broadcast management operations.

1.3 Campus broadcasting radio station: The campus radio station is mainly responsible for campus cultural propaganda, activity establishment, notice, speech, and early warning.

1.4 Public area coverage: The public areas outside the building, campus main roads, sports fields, etc. are divided into several areas, and any single area, combination area or all areas can be selected for broadcasting.

2, audio design

2.1 Digital Source Design

1) The digital audio source is the audio signal output by the computer. It plays digital audio files in the computer. Including MP3, WAV, MIDI and other audio formats. We design an IP broadcast server GM-8008B, this machine is industrial control touch screen computer, embedded installation design;

2) The characteristics of digital audio sources are that they can be broadcast automatically at regular intervals. With the universal application of broadcasting systems in school education and teaching, the demand for automatic broadcasting of schools has gradually increased. Musical ringtones, English listening training and examinations are inseparable from the automatic Demand for broadcast.

3) This broadcast system has designed a set of digital sound sources. The system server host is used to play digital voice files. In the case of a 100M network card, at least 512 programs can be played simultaneously.

4) The IP network management platform can be used to collect radio programs in the network, such as inter-American, BBC radio, central radio and telephone station news, English programs, and other regular broadcast to the system.

2.2 analog audio source design

1) DVD player: DVD is the most commonly used analog sound source in schools. It is mainly used to play educational and teaching optical discs. The device model is GM-8621T. Can be fully compatible with CDDVDMP3 and other media playback;

2) Tuner (AM/FM radio): It is used to listen to and relay radio English listening content and important news. Equipment Model:GM-8620T

3) Broadcast microphones: used for local speech and temporary broadcasts, such as broadcast announcements, leadership speeches, broadcasts on campus radio stations, etc. Equipment model: GM-340.

4) Wireless Microphone: The wireless microphone is mainly used for on-the-spot speeches when raising the flag on the playground, holding sports games and large-scale activities. The device model is GM-9200U.

5) Wireless on-demand system: The wireless on-demand system is mainly used in the school sports field area and is responsible for the physical education teacher. This system can play specified audio files to reach the broadcast area. It is used for activities such as square flag raising and sports games. The device model is GM-8608S.

3, campus radio station design

3.1 The Significance of Designing Campus Broadcasting Stations: Campus radio stations are an inevitable feature of designing university class IP network broadcasting systems. School campus broadcasting station administrators regularly broadcast the entire school, such as ringing the bell, playing background music, and broadcasting announcements. Schools have a campus cultural propaganda window, is the campus radio station, university radio stations are generally set in the Youth League, there are specialized teachers responsible for organizing students to carry out school-wide radio, such as holding various campus community activities, campus cultural propaganda.

3.2 Campus radio station equipment configuration: IP color network network seek microphone GM-8003; to achieve the function: the main speech, LCD screen display, user-friendly operation interface, a key help function, fast connection with the control center, the operation is simple and fast, at the same time Avoid using computer resources. In the event of an emergency broadcast, the local mandatory priority function can be activated to implement the local artificial emergency broadcast function. Also suitable for use in emergency broadcast systems, works offline without computer support. In addition, we have deployed a professional broadcast microphone GM-740 for campus radios and a GM-PV8 digital mixer. One audio source computer. It is possible to synchronize broadcasts with music or split broadcasts.

4. Broadcast design of public activity areas outside the building: The areas of public activities currently involved are mainly public activity areas among buildings. The sound design covers the principle of no dead ends. We designed the speakers outside each building, and designed two high-power all-weather rain-resistant sound column GM-628s in each building, with a single power of 60W and a total of 32 buildings in 16 buildings. Each building has a 350W design. IP network power amplifier, model number is GM-IP350, can achieve all the public access to the public area outside the broadcast access, play background music, class ring tones and so on.

5. Regional Broadcasting Design for Campus Main Roads: There are three main roads in the campus, each with a length of 1,500 meters. The sound column design is required. The core design of the main road is covered by sound. We install high power on the main poles of the campus roads. Rain sound column, designed for a distance of 75 meters. Install 60, because the line is relatively long. We designed the sound column of the main school campus as an IP network column, model number is GM-8006S; each power is 30W, this column has its own power amplifier, network cable access can achieve addressable playback; digital-grade sound quality, It is very suitable for broadcasting on university campuses and creates a very warm atmosphere of university culture.

6. Standard 400-meter playground broadcast design: Install 4 wide-area full-range high-power horn loudspeakers in the playground area, model number is IP15 (400W). This horn has the characteristics of strong penetration and high sound pressure level. The sound pressure drop of 100 meters is less than 5dB, and the playground is a separate area. The design of this area can meet the requirements for holding large-scale performances and activities such as sports games. The total power of horn loudspeakers is 1600W. Based on the playing field, the frequency and distance are relatively far. We configure one IP network access terminal GM-8004A, two 1000W power amplifiers GM-P1000A, and the other sports field configure the wireless on-demand equipment GM-8608S. Configure two sets of GM-9200U wireless microphones to meet the comprehensive use requirements of the sports field.

Third, the main function of the system

1. Digital transmission: University digital network broadcasting adopts a unique CD-quality data file format. Through the TCP/IP protocol, the broadcasting microphone, deck, radio head, audio network server, and sub-control host audio are transmitted to each channel in digital format. A network broadcast receiving terminal, this full digital transmission method avoids the attenuation of audio signals and noise, ensuring high-fidelity audio playback.

2. Personalization of terminals: University digital network broadcasting broadcasts are based on WAN, LAN or INTERNET. Each network broadcasting terminal can have a unique IP address in its own network and can play different music at the same time. The maximum number of broadcast programs can be reached. Thousands of sets, fully meet the university digital network broadcasting.

3, front-end networking: University digital network broadcasting will be extended to the entire front-end audio source network, the program can be played at regular intervals through the network remote operation. Network management can also set different permissions for different users.

4. Play automation: University digital network broadcasting can realize automatic playback, and specify the playing time for each program, the server will automatically play, and the content and object range can be specified arbitrarily.

5. User-friendly operation: University digital network broadcasting provides a humanized graphical menu interface for the school. It is easy, convenient, and practical, improving the efficiency of use.

6. Application intelligence: University digital network broadcasting has a lot of intelligent design. It can realize voice functions such as recording, variable speed, and list looping in the broadcasting process. It can also realize timing settings and realize automatic broadcasting; and it can be arranged and maintained remotely. Management.

7, the simplification of the project: University digital network broadcasting project is simple, for each existing IP LAN broadcast site, you only need to increase the installation of network broadcast adapter can be, if you do not build the network, the amount of data network engineering is relatively simple, only need The network cable can be laid, and once the broadcasting system and the network system are built, it can be shared, reducing the redundant construction of multiple networks.

8. Zero maintenance of the system: University digital network broadcasting is shared with the network physically, so it does not add extra maintenance work beyond network maintenance. In the application, the system can be set up separate from the computer network system, each network broadcast adapter embedded system program is solidified, will not be infected by the virus. The overall system is stable and reliable, and there is basically no maintenance work.