1. Overview and requirements
The school is located in the core area of ​​Beijing and is a model school of Haidian District's key middle school. The current campus architecture is as follows:
¤ 2 buildings with 5 floors and 120 meters long corridor with a total of 98 classrooms;
¤ A 6-storey administrative building, with a corridor length of 100 meters and a total of 30 offices;
¤ 2 dormitory buildings are 5 floors, and the corridor is 100 meters long;
¤ 1 canteen with 2 floors, 3,000 square meters per floor;
¤ A standard sports field outdoors;
¤ Campus outdoor trunk roads and green belts and other areas.
At present, the school plans to establish a digital campus daily broadcasting, teaching broadcasting and background music system. Requirements are as follows:
1. Adopt IP network broadcast system, use the existing local area network and realize the integration of multiple networks; full digital transmission, covering the entire campus.
2. The system has good scalability. As long as the campus network can cover the broadcast information point, all networked computers in the campus network can be used as the branch control point of the campus broadcast system, such as the teacher's office, student office, and leadership. Each office can set up broadcast sub-control workstations.
3. It is required to use a computer to operate the broadcasting system, to meet the basic needs of regularly playing the music ringtones of the classes, the inter-class radio exercises, eye exercises, daily broadcast notifications, etc., and to realize the unattended campus digital automatic broadcasting function.
4. The campus broadcasting system can be set up through the software to achieve unified centralized system control and management throughout the school, and can be independently controlled and managed in each area, which can meet flexible zoning and grouping without the need for additional wiring. Broadcast administrators can flexibly change classroom grouping settings according to the actual situation. The teaching building can implement a point-to-point broadcast system. Classrooms can be assigned programs at the same time by grade or class, or English listening training and exams.
5. The teaching building, administrative building, canteen and dormitory on the campus can be divided into several fixed partitions, and all buildings can be combined or controlled arbitrarily in the broadcasting center. You can listen to the same source program at the same time, or broadcast separately.
6. Campus broadcast requires monitoring function. System administrators and authorized leaders can monitor or monitor the content of any broadcast point on campus in real time.
7. The campus broadcasting system also requires to be able to satisfy school broadcasting (such as: issuing administrative notices, leadership speeches, etc.), emergency fire broadcasts, campus background music, English listening learning, relaying radio stations, playing music and music appreciation, etc. Create a good campus environment.
2. System 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. The construction of Jinmai Video Campus Digital IP Network Broadcasting System is based on the requirements of school users, using modern computer software engineering, TCP / IP network, automatic control, voice codec and other information technologies to promote the integration of multiple networks and establish multi-level, Innovative and open model schools, guided by new teaching concepts and management theories, go beyond the traditional education model and improve the quality and efficiency of comprehensive schools.
With the advancement of modern education construction today, modern buildings are rapidly developing toward large-scale and comprehensive directions, so that the management of broadcast audio systems has become more and more complex, and the requirements for system functions and reliability are becoming higher and higher. This 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, a variety of different speakers are used to cover the entire teaching function area and the sound field in the campus.
2. System design description
â‘ This design makes full use of the existing campus network, or pre-frames the basic campus network system to reduce repeated wiring and construction projects, which is simple and fast. Realize the campus broadcast system to meet the daily management, timing, real-time playback requirements, less equipment, simple maintenance; friendly interface and easy operation. The daily teaching broadcast and listening learning effect is good, effectively improving the learning effect. Make sure the sound is clear and smooth in the English listening test.
â‘¡ The division of broadcasting is reasonable. The network broadcasting terminals of each district can speak to the broadcasting point in this area, or can perform two-way paging and intercom with the broadcasting main control room, leading workstation, and broadcasting terminals in other areas. For example, the dormitory administrator can broadcast affairs, notify, call people, etc. to the dormitory he manages through the GM-8003D broadcast terminal installed in the management room.
â‘¢ The GMTD Jinmai video network paging terminal GM-8003D installed in the leadership office can select any classroom for individual traffic notification, and select a terminal with intercom function for two-way intercom to achieve more convenient internal communication. The office can publish management information to the classrooms under management.
â‘£Like other standard network equipment, digital campus network communication can be used. The broadcast workstation installed on the teacher or leader laptop can work in any area covered by the campus network, which is convenient for teachers' office needs.
⑤ The main control workstation (main control center) of this campus broadcast is designed in the broadcast monitoring control center on the first floor of the teaching building, which can realize any point-to-point single-point control. The corridors and outdoor areas such as teaching buildings, administrative buildings, dormitory buildings, canteens, etc. are divided into several areas, so that single points, groups or all broadcast points can be selected for broadcasting.
â‘¥This system is designed to forcibly insert the emergency broadcast of fire protection and public emergencies into this broadcast system. The system design network alarm host adopts a networked interface, which can expand the number of fire routes at will; 16-channel fire signal input, fire signal network transmission, and any point setting Call the police.
3. System front-end audio source design
The audio source of campus broadcasting system includes digital audio source and analog audio source. Mainly use computer (system server host), high-quality DVD player, touch-type dual deck, digital tuner, broadcast microphone, wireless microphone, etc.
â‘ Digital 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 digital audio source is characterized by automatic broadcast at regular intervals. With the broadcast system in school education and teaching The universal application of the school has gradually increased the demand for automatic broadcast of music. Music ringtones, English listening training and exams are inseparable from the demand for automatic broadcast. Therefore, we have designed a digital audio source for the school's middle school broadcast system. 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.
â‘¡ Analog sound source design
a. DVD player: DVD is the most commonly used analog audio source in schools. It is mainly used to play educational and teaching CDs. This system is designed using Jinmai Video GM-8621T.
b. Digital tuner: also known as the radio head (AM / FM radio) is used to listen to and broadcast the English listening test content of radio stations and important news programs, etc. The tuner of this system is designed using Jinmai Video GM-8620T.
c. Deck: It is used to play audio files of magnetic tape. The system design adopts Jinmai Video GM-8622S.
d. Broadcast microphone: used for the principal's speech, the speeches of the teachers in charge, broadcasting announcements, holding parent meetings, etc.
e. Wireless microphone: The wireless microphone is mainly used for raising the flag in the playground and doing radio gymnastics. The teacher in charge speaks in the playground. This system is designed using Jinmai Video GM-9100U.
4. System overall control design
The overall system of campus broadcasting is designed for network transmission, that is, network broadcasting system. In terms of intelligent control, we use the broadcast server host + server management software, which can control network terminals (including digital network speakers, digital network broadcast rack control terminals, digital network broadcast paging terminals, etc.), and through these terminals Connected constant pressure broadcasting equipment (constant pressure power amplifier + speaker), so as to control the broadcasting of some constant pressure equipment. The classroom part adopts the method of wall-mounted digital network speakers, or wall-mounted digital terminals + speakers, and the other parts are designed for zone broadcasting. Campus network broadcasting can be controlled to broadcast to every point, and constant pressure broadcasting can be controlled to broadcast to every area. Different control methods are relatively independent and do not interfere with each other.
5. System partition design
Zoning is to facilitate management. All parts that need to be treated separately should be divided into different zones to meet the management of daily broadcasting. In each zone, a digital network broadcast terminal is used to receive audio signals and transfer to a constant voltage power amplifier. The zone matches a suitable power amplifier according to the total power of the broadcast speaker, and has good scalability.
The whole school is a total area, and all broadcasts can be realized;
Among the 98 classrooms in the teaching building, each classroom is a separate partition (that is, 1 addressing point); the same grade can be compiled into a group, and each group can be set to 1 partition; other public areas are divided into 8 partitions (School public areas require division).
â‘ There are 2 teaching buildings, and each corridor is a partition;
â‘¡ The administrative building is divided into 2 zones, and the office and corridor are each divided into 1 zone;
â‘¢ The dormitory building is divided into 2 zones;
â‘£The canteen is a partition;
⑤ The outdoor playground is divided into 1 zone.
6. System digital network broadcast terminal design
â‘ Classroom speaker design in teaching building
a. Classroom: Design and install 10W wall-mounted wooden digital network speakers GM-8001. At present, there are 98 classrooms in the teaching department, and a total of 98 pairs of digital network speakers are needed. They are mainly used for broadcast notification, English listening teaching, music ringtones, etc.
b. Featured functions: The network speakers in the classroom should not only be used for teaching broadcasts, but also have audio signal input ports. If a desktop or laptop computer is used for teaching in the classroom, the sound output by the computer can also be amplified by the speakers Output, to carry out teaching activities, that is, the speaker terminal and the local classroom multimedia courseware amplification function, the two sets of audio sources need to be organically combined.
â‘¡ Teaching corridor area
The teaching building has 2 floors and 5 floors, and the corridor is 120 meters long. Ceiling speakers are installed in the corridor of the teaching building. 10 GM-513 ceiling speakers are designed for each floor according to the length of the corridor. Each building is set up as a partition, and a network broadcasting terminal GM-8004 is designed and installed. This area mainly receives school broadcast notifications, ring tones for class music, ringing at work and rest, background music, etc. Cables are led from the convergence equipment in the area to the control room along the weak current network.
③ Office and corridor area of ​​administrative building
The administrative building has 6 floors, 30 offices, and the corridor is 100 meters long. In the administrative building, the 2 sub-district offices can be divided into 1 area and the corridor is 1 area. Two network broadcasting terminals GM-8004 are designed and installed in this area. Each office is equipped with a wall-mounted speaker GM-356 (3W / 6W), which mainly plays the ringtones of teachers' commuting to work, that is, school daily management notices, leadership speeches, etc .; according to the length of the corridor, each floor design 6 GM-513 ceiling speakers The corridor in the whole building is set up as a partition, which is mainly used for school broadcast announcements, music ringtones for classes, etc .; cables are led from the convergence equipment in the area to the control room along the weak current network.
â‘£ Dormitory area
The school dormitory has 2 buildings and 5 floors. Each building is designed as a partition, and two network broadcasting terminals GM-8004 are designed and installed. Corridor design wall-mounted speakers, according to the length of the corridor, each floor design is installed with 6 GM-356 wall-mounted speakers, which can usually receive the daily broadcast notice of the campus broadcast room and the ringtones of the class music; The sub-control broadcasting room is usually used as a campus broadcasting zone. When necessary, it can play the school's temporary notifications, find people, wake up number and light-off number and other music ringtones.
⑤ Canteen area
The canteen is designed to install a network broadcasting terminal GM-8004 for one district. Considering the humanized design, the system is designed to automatically play relaxing background music in the cafeteria separately during breakfast, lunch break, and dinner to suppress the noisy noise and create a good dining environment for teachers and students. The broadcasting in the canteen area mainly receives the content of the main campus broadcasting machine room, and realizes automatic music ringtone or work and rest management. According to the different wiring methods, you can also broadcast radio programs independently. For example, some evening parties or party activities in the cafeteria, activities such as speech reports, etc., the local can directly control the playback of local audio programs. The canteen is a building with 2 floors. Each floor is designed with 16 6W GM-513 indoor ceiling speakers according to the area of ​​the restaurant. The cable adopts a double-core sheathed cable and is laid to each broadcasting point.
â‘¥ Outdoor sports playground area
The main function is to play automatic music ringtones, background music, student fitness rhythm exercises, radio announcements, school scenery introductions, and welcome speeches. The volume effect is required to be moderate, so that the entire campus can achieve a harmonious background music atmosphere, according to the area of ​​the outdoor playground Equipped with 10 GM-418 wall-mounted outdoor rainproof sound columns. For various kinds of competitions, sports games, flag-raising or large-scale gatherings, outdoor cables use network cables and double-core sheathed cables.
7. System power amplifier design
The power amplifier is an 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 lines and other equipment when configuring the power amplifier, and the system There is also redundant power to ensure the stability of the system. The general principle is about 1.5 times greater than the actual power.
3. System features
1. Automatic music ringing / timed broadcast management
The school administrator can set the running time of the school bell in the management software according to the needs of the broadcast content and according to the school's daily school time. One or more scheduled broadcast tasks can be established by hour, day, week, and by terminal, program, and time.
For example, playing campus songs and national flag-raising national anthem and eye-safety key exercises during break time, the schedule can be adjusted automatically according to the seasonal changes of spring, summer, autumn and winter, and provide special configuration options for sunny and rainy days and holidays. The system will automatically perform all specified tasks without manual operation.
2. Personalized timing playback
Each digital network broadcast terminal of Jinmai has an independent IP address, and each can individually receive the personalized scheduled broadcast program of the server. For example, different grades or grade groups can play different English listening programs at the same time. Event notifications of different contents are carried out simultaneously in different areas. You can flexibly set the area to be played.
3. Free broadcasting in all areas
Through the setting of the control software, it is possible to arbitrarily broadcast a certain area or a few areas, such as background music for public areas, living areas, libraries, and other areas. Or temporary broadcasting, such as a leader's speech, broadcast announcement, etc.
4. Permission settings
The system can set up various roles, set up the main administrator, supervisor leader, query administrator, control administrator, administrators with different permissions can perform different authorization operations. You can also set permissions on the terminal, unauthorized operations are invalid.
5. Broadcast monitoring
The system broadcasts content, and administrators or leaders can monitor the content of each channel broadcasted by the system in real time to understand the broadcast status of the program. Monitor its playback content and volume, in order to adjust the volume and playback content of each remote network adapter.
6. Emergency alarm
The system usually plays music broadcasts. When there is an emergency broadcast request, the system immediately switches to the emergency broadcast state and performs 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, it will automatically local alarm Notify each control point, give an alarm to the area to which it belongs, improve the efficiency of crowd evacuation and reduce the degree of loss.
7. Emergencies, broadcast notification
The system can broadcast announcements to various classrooms in the event of an emergency. Leaders do not need to go to the broadcast center. Through any computer connected to the system server, they can remotely talk through the computer's microphone to quickly solve the emergency. .
8. Radio relay
The system can convert Internet radio programs received through Internet radio software into IP network broadcast data format, which can be played in real time on network voice terminals, such as Voice of America, BBC, CNN, and other specialized language radio stations in China. Teachers and students can get the latest news.
9. Real-time audio broadcast
Program real-time acquisition and broadcast function, the system can collect real-time compressed real-time tuner, CD player, MP3 player, microphone and other programs into a high-quality data stream stored in the server, and can be simultaneously relayed to the specified network adapter as required for Insert broadcast of external programs and broadcast notifications.
10. Independent control, playback function
The sports playground area is equipped with locally used audio source equipment, such as DVD players, tuners, GM-8003D network paging terminals, etc., which can play its unique audio signal according to the corresponding activities. The system performs functions such as individual broadcast speech.
11. Power remote, management function
The GM-8004 digital IP network broadcast terminal for partitioning provides an audio trigger interface or its own trigger power supply. When the voice and music of the broadcast speech are connected to the network adapter, the power supply of the power amplifier or the active speaker can be automatically switched according to the presence or absence of the voice signal, or other devices can be linked to broadcast normally.
4. Sub-control station
1. Teacher Workstation
Teachers can use the workstation software to submit scheduled playback tasks without going to the main control room, arrange voice playback plans and teaching materials needed for teaching in classrooms within the authority, and create a good learning atmosphere. The self-made audio teaching courseware can also be uploaded to the server, which can be played automatically at regular intervals or for classroom playback.
2. Leader Workstation
With remote control and paging function, the principal can publish school management information in the office without going to the computer room. The computer of the principal's office can be installed with sub-control software and common microphones. The principal can make a whole-school broadcast speech without leaving the office, saving office time and breaking through the traditional principal. He must go to the main room to speak to the whole school.
3. Student Broadcasting Station
The student union can take charge of the school's broadcasting and publicity work through the main control center of campus broadcasting. 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 areas are the campus outdoor and playground areas.
5. System Topology
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