Key high school campus intelligent broadcast integrated solution

Part 1: Customer needs

1. School situation

Our school is a provincial-level key high school with a total of more than 3,000 students in 3 grades. All these years have been college entrance examination sites. With the further improvement of the country's education quality requirements, our school's original fixed-pressure broadcasting system has been unable To meet the needs of actual English listening examinations, learning and training, I want to build a new type of intelligent integrated broadcasting system to meet the teaching and examination needs of the new era.

The general situation of the school is as follows:

1) Teaching building: 5 floors, with 60 classrooms (classroom size is 65 M2), 3 grades, 20 classes per grade, each floor of the corridor is 90 meters long.

2) Science and technology experiment building: on the 4th floor, there are 30 laboratories (for the physical and chemical laboratory, there is also a 666 square meters of ladder classrooms, and two multimedia classrooms of more than 300 square meters).

3) Library: 2 floors, each with a size of 1500 M2 (each floor has a large room with a lot of books and a few small rooms) The length of each floor is 80 meters, you need to install a broadcasting system and require separate control , It is convenient to play temporary notices in the library and background music for opening and closing the library, creating a cheerful and relaxed reading environment for students.

4) Administrative office building: 3 floors, where teachers work, there are 8 offices on each floor, and the corridor length is 60 meters.

5) Canteen: The canteen is a two-story building, each with a size of 2500 square meters, 6 pillars in the middle, and 4 TVs on the wall.

6) Dormitory: There are a total of 2 buildings (one for men and one for each), each one hundred dormitory, male dormitory has 6 floors E-shaped, female dormitory has 5 floors, the corridor length is 101 meters.

7) Large playground: 4 meters * 100 meters long standard track, there are 6 basketball courts next to it.

8) Small playground: There is also a small playground of 60 * 80 meters at a distance of 200 meters from the large playground for students to exercise.

9) Ring road: There is a ring road around the lake. There are 80 street lights distributed on both sides of the road, with an average of 30 meters per side.

10) Lawn: There is a main road 100 meters long and 25 meters wide at the entrance of the school gate to the teaching area. There are two green belts on both sides.

2. Specific functional requirements

1. The school requires the host to automatically switch on and off every day to achieve music ringtones, regularly play eye exercises, radio gymnastics, and early morning and evening self-study English listening training broadcasts to achieve unattended.

2. A certain class can be broadcasted separately: because English listening courses are usually required, the system is required to perform listening training or broadcast to a class regularly or arbitrarily, without affecting other classes).

3. Different classes can listen to different programs at the same time. Since most of the English listening training in schools is played during the morning self-study or late self-study time, you will encounter several classes taking English listening training classes at the same time, but the listening content is different. Therefore, the system requires that different classes can Listen to different programs.

4. Simultaneously play different content for different grades.

5. The system is required to play multiple sets of digital programs and analog programs at the same time, and each classroom can choose to listen to the programs they need.

6. The library needs to install a broadcasting system and requires separate control (both can be used by itself or accepted by the main control room), which is convenient for the library to play temporary notices and background music for opening and closing the library, creating a cheerful and easy reading for students surroundings.

7. The canteen is individually controlled (both can be broadcast independently and can be controlled by the main control room), using elegant music to reduce the noise to create a pleasant dining environment for students.

8. The dormitory needs to be controlled separately and can be used for intercoming or looking for a single dormitory at the boarding house. It is required to call multiple rooms at the same time and monitor each room to achieve the purpose of intelligent management.

9. The playground needs a separate set of broadcasting system, which is usually controlled by the main control center. When there is an important event or sports meeting, you need to switch to a separate state to speak or play music. The control box is placed under the podium. There is a special person to operate the small operation room.

10. It is required to realize the deputy control of the principal. The principal can speak to the whole school in the office.

11. The broadcast is required to have an emergency insertion function. (In case of emergencies: such as important notices, headmaster speeches, and alarm announcements. You can end automatic playback at any time and enter emergency broadcasts).

12. The overall project wiring specification, the system equipment selection is reasonable, the operation is convenient, meets the school's development needs, and the interface is reserved for the school's expansion.

Part II: Scheme design

1. Overall system design

According to the needs of the school, the entire system is designed as a campus integrated intelligent broadcasting system:

a. Classroom and laboratory areas are designed as FM broadcasting systems;

b. The dormitory is designed as a separate addressable call intercom system;

c. Other areas are designed as constant pressure zoning systems. According to the characteristics of the school, we tentatively divide the rest of the entire campus into 8 areas, namely: teaching area corridor, library, administrative office building, dormitory area, canteen area, playground Area, ring road area, green belt area. The main control room uses an eight-way partitioner. For the future expansion of the school, the eight-way partitioner has a cascade function, which can be increased at any time according to the needs of the school.

2. Design of Broadcast Control Center

Located in the school's broadcast control room, the overall broadcast system is controlled by computer. The control host controls the FM speaker and partition controller through the RS485 control bus to achieve the intelligent needs of broadcast control. At the same time, the control host can realize multi-channel digital The audio is automatically played to meet the needs of digital audio broadcasting at the same time in each grade. It is also possible to set up a broadcast payment control system in a specific area so as to broadcast individually to a specific area.

3. Multi-channel digital playback control host design

The system uses a multi-channel digital playback control host, set up 6 sets of program sources (4 sets of automatic broadcast programs, 2 sets of analog program sources). Satisfy multiple grades and multiple languages ​​for simultaneous voice teaching or English listening test and training, and different programs are broadcast simultaneously in different areas. For example, the first grade, second grade, and third grade can play or listen to their different English listening tests and training content at the same time.

4. Design of broadcast receiving point

â‘  Classroom area addressing FM design: Each classroom uses Beijing Jinmai Video GMTD-FM addressable full-channel FM speaker, the speaker power is 10W, the stereo channel, the sound distortion is small, meet the English listening needs, the speaker receiving frequency It is continuously adjustable from 87MHZ to 108MHZ and can receive more than 60 sets of programs at the same time. Each speaker is equipped with a remote control. The system design small classroom is equipped with an FM speaker. The small classroom of 300M2 is designed with an FM speaker main box with an auxiliary box, 666. M2's large classroom is designed with 2 main boxes and 2 auxiliary boxes. A total of 110 addressable FM speakers (GMTD-FM8A) are required. Among them, 35 auxiliary boxes are required (ten main boxes are reserved).

â‘¡Corridors in the teaching area: Including the corridors of the teaching building, the corridors of the experimental building, three wall-mounted speakers are installed on each floor of the teaching building, and a total of 12 are installed on the fourth floor. The experiment building is installed with three wall hangings on each floor, and a total of 12 speakers are installed on the fourth floor, with a total of 24 speakers.

â‘¢Library: According to the requirements, it is designed as a separate area, and the background music is used to solve the problem of boring and lifeless libraries in the past. We installed ceiling speakers on the ceiling, an average of 60 M2, and 25 6W speakers on each floor. , 2 floors, 50 in total, install a switch at the interface, when the library wants to use it alone, just close the switch.

â‘£Administrative office building: Considering the school office needs, so a separate area, a three-story building, each installed three, a total of nine, we install a switch at the interface, when the administrative office building leaders want to broadcast separately in an emergency Only need to close the switch.

⑤ Design of the canteen area: The canteen is on the second floor. Considering the dining time of the canteen, students are concentrated and the sound is noisy. The sound requires full coverage and the design standard of the canteen is installed. Therefore, we installed 4 indoor dustproof sounds in 4 corners of the canteen Column, using elegant background music to bring students a happy and pleasant dining environment. A total of 8 are installed on the second floor. We install a switch at the interface. When there is an emergency in the cafeteria and want to broadcast separately, we only need to close the switch.

â‘¥ Dormitory area: According to the requirements, our door installs a system GMTD-JXZQ call intercom system separately. Under normal circumstances, the system automatically runs and controls. In case of emergency, it can be switched to the main control system. The connection achieves the purpose of emergency broadcasting and emergency control. We install a 3W wall-mounted speaker in each room, 200 dormitories, a total of 200 installations, and a Jinmai video addressable call intercom controller in front of each speaker.

⑦ Playground area design: The playground is mainly used for various competitions, sports games, broadcast exercises, and physical education classes. The design uses a separate broadcasting system, which has facilitated the on-site interpretation, awards, and playback of various competitions and sports games. Music etc. At the same time, we design a connection between the stadium's broadcasting system and the school's main broadcasting system, and set up a manual switch. When the stadium's broadcasting needs to be connected to the school's broadcasting system, just close the switch to achieve the connection. . The controller can be placed in the small room under the stand; in addition, considering the severe weather conditions, a 400-meter standard playground is designed with 6 60W outdoor sound columns. Considering there is a basketball court next to it, 2 more outdoor sounds are added. Columns, small playground design and installation of 4 outdoor rain sound columns, a total of 12 40 / 60W outdoor rain sound columns are designed, with a total power of 720W.

⑧ Lawn: The public area of ​​the campus is mainly background music, and the volume effect is required to be lower. The main road is the entrance of the school. There are 2 large green belts on both sides. Designed and installed 30 lawn speakers with different shapes on the grass, considering the beauty of the background music system, all areas are designed with simulated speakers. The so-called "simulation" is because the shape of the speaker is different from that of ordinary speakers. It is made according to various physical shapes in nature, such as mushroom shape, stone shape, rockery shape, tree stump shape, street lamp shape, etc. Such speakers are distributed in the lawn, you can hear elegant music coming, but you can't find the source of the sound.

⑨Street lighting area: The artificial lake of the school has a road around the lake. There are 114 lamp poles on both sides of the road, an average of 15 meters, and a total of 29 20 / 30W double-sided sound poles are installed according to the ratio.

â‘© Campus partition design: The current 8 partitions are designed and equipped with a GMTD-8DV eight-way partition controller. To facilitate the future expansion of the school, the partition controller has a cascade interface. When the school partition needs more than 8, it can be replaced Equipped with an eight-way partition controller, the system can support sixteen partitions, which can fully meet the needs of the school.

5. Power amplifier design

Since the outdoor playground and the classroom have different requirements for the size of the sound, the indoor and outdoor power amplifiers are designed separately. Considering the line power loss, the power of the power amplifier should be greater than or equal to 1.3 to 1.5 times the total power of the speaker. According to the principle of the power amplifier The zone will be equipped with a single power amplifier. The specific design of the power amplifier is as follows:

The design of the two power amplifiers is to set up a manual switch between the equipment in each area. Usually the school broadcasts uniformly. When there is a need for a separate broadcast in a certain area, you only need to close the switch to cut off the connection with the broadcast main control room. The region has been broadcast, such as the organization of the conference, speeches, awards and other broadcasts in the playground when the sports meeting is held.

Finally, in order to ensure the normal teaching activities of the school and the smooth progress of the listening test, we also designed two 1000W standby power amplifiers for the system. When a power amplifier in the system fails during broadcasting, the teacher in charge can immediately pass the main power amplifier Switcher, switch to standby amplifier to continue broadcasting.

6. Design of preamplifiers: 7 units in total, 1 auxiliary control system, 1 headquarters, 1 library, 1 administrative building, 1 canteen, 1 playground, and 1 dormitory.

7. Power supply design: An RVV2 * 1.5 two-core sheathed power cord is distributed from the broadcasting room to the classroom. The addressable controllers in all classrooms implement centralized power supply, which is convenient for the audio-visual teacher to manage the broadcasting system in a unified manner.

Part III: Main functional characteristics of the system

1. Auto-play function

The system can automatically play radio exercises, eye exercises, national anthem, athlete march, preparatory music bells, class music bells, class music bells, class music, wake-up numbers, etc., and news, according to the schedule set by the school. English teaching programs and other optional radio music and programs in schools.

2. Scheduled playlist

According to the teaching and management needs of the school, the system can pre-arrange the day and week playlists. The daily playlists can be set arbitrarily and are not limited by the time period and length of time. The day of the week will be judged automatically, and then automatically played according to the arranged playlist. Playlists can be stored, modified, and edited.

3. Cycle function

After arranging a week's play schedule, it can be played in a loop throughout the year without resetting every week.

4. Large playback capacity

Because it is automatically broadcasted by the computer, thousands of ringtone music, various radio exercises, eye exercises, classroom music, various language teaching, and English teaching programs can be stored in the computer to form a sound File material library, for selection when arranging playlists, and can also play audio files on the disc.

5. Set the play identifier

Various play identifiers can be set according to the play content, such as class bell, class bell, and inter-class exercise.

6. Play temporary radio

The system is divided into manual and automatic modes. If the school has temporary broadcast content to be played, it can end the automatic playback state at any time and enter the manual playback state for playback.

7. Compatible functions

The automatic broadcasting system can be added to any kind of broadcasting system such as: active broadcasting system, constant pressure broadcasting system, FM broadcasting system, wireless broadcasting system, etc.

8. Partition control function

The system can control the speakers of playgrounds, corridors, campuses, etc. regularly by way of partition controllers according to different content and needs. If a parent meeting is held in a certain grade, only the area where the grade is located will be played. If a certain grade is used for the English listening test, only the speakers in the area where the grade is located will be turned on for playback.

9. Fire emergency linkage

When an emergency occurs, the automatic broadcast will be urgently switched to the emergency broadcast state to help the school evacuate the crowd.

? Addressable FM broadcast system main functions:

1. Multi-channel stereo playback

The system can provide dozens of stereo playback capacity (87MHz-108MHz) to meet the teaching and examination needs of different classes and grade language courses, as well as various needs of campus broadcasting. The traditional broadcasting system generally only has the functions of the principal's speech, playing music, radio exercises, etc., and intelligent FM broadcasting can build multiple sets of broadcast programs according to the needs, and each listening point can also listen to different programs according to different needs, providing students with multiple content, Multilingual campus radio program.

2. Authorization management

The main control system adopts computer control, visual operation interface, intuitive control interface and simple operation. The operation platform of the central control room can be used to authorize management of the classroom, control the switching of classroom speakers, listening channels, etc., and have control priority. That is, when the main control room controls the speakers at the classroom end, the remote control at the classroom end can only control the volume of the speaker volume, but cannot control the switch of the speaker and the channel to listen to, so as to ensure the normal conduct of the listening test and listening training.

3. Power management

The central control room can control the power switch of the FM speaker in a classroom or all classrooms through the automatic playback host to ensure that the speaker power is turned off when there is no broadcast, to avoid crosstalk from external signals and affect the teaching effect.

4. Scheduled playback

The automatic playback control host can automatically switch the machine on and off according to the needs of the school, and automatically play the bells, radio exercises, eye exercises, national anthem, etc., to achieve unattended operation.

5. Multi-channel digital playback

The automatic playback control host can broadcast multiple digital audio files at the same time, which has met the needs of multiple teachers or multiple grades for simultaneous English listening training and exams.

6. Total cable transmission

The system uses radio frequency transmission technology to transmit the broadcast signal and the closed-circuit television system in the same cable, saving network investment.

7. Fixed-point broadcasting

Can realize the point-to-point directional broadcasting function, according to the need to broadcast a classroom individually, or free group broadcasting to multiple classrooms.

8. Full channel reception

FM speakers can receive more than 60 sets of broadcast programs at the same time. When the system program source is increased, there is no need to replace the speakers, just add the front-end modulator.

9. Flexible channel setting

The frequency adjustment of the modulation end and the receiving end of the system are continuously adjustable. The channel setting can be carried out on site. When the local FM station interferes with the school's FM broadcast, the frequency of the front and back ends can be adjusted at any time to avoid interference Channels to ensure the quality of broadcasting.

10. The system has audio insertion function

With the NES2000 audio inserter, it can realize the audio insertion function, realize the principal's speech, and uniformly listen to important news programs.

11. Remote control function

The controller can perform channel setting, storage, deletion and other functions through the remote control. You can control the storage, deletion, channel addition and subtraction, and volume addition and subtraction of the channel through the remote control.

12. LED frequency display

The controller is equipped with 3 LED digital tubes, which can display the frequency of the current receiving channel.

13. PLL phase locked loop frequency stabilization

The system uses PLL phase-locked loop frequency stabilization technology in the receiving part to ensure that the receiving frequency is not affected by changes in ambient temperature, thereby ensuring the listening effect of the broadcast.

The main functions of the dormitory broadcast call intercom system:

1. All broadcast

The system can automatically or manually broadcast all broadcast receiving points at the same time, such as music ringtones, wake-up number, light-out number, background music, leadership speech, news broadcast, emergency broadcast, etc.

2. Fixed-point broadcasting

The system adopts computer control, which can realize authorized broadcasting to any single room, such as: broadcast notice, find someone, etc.

3. Group broadcasting

The system can arbitrarily group broadcast all the dormitories, such as broadcasting all the dormitories in a certain grade and playing English listening programs.

4. Call intercom

After the main control room authorizes a certain dormitory, it can call and talk to it. For example, if the dormitory finds someone, after the main control room calls, the response of the called dormitory is passed back to the broadcast room to make it judge whether the person you are looking for .

5. Monitoring management function

The dormitory duty control room can monitor and monitor a dormitory at any time, or monitor the rest of each dormitory after the lights are turned off.

Part 4: Equipment configuration list