1. Customer needs
Our school has a total of 54 grades in nine grades, including primary and secondary schools. There are 5 classes in each grade of elementary school and 8 classes in each grade of middle school. A broadcasting system is currently required. The specific requirements are as follows:
1. Each grade can be broadcast separately, the playground must have a broadcasting system.
2. There are different schedules for classes in the elementary school and middle school. There is one lesson in 40 minutes in the primary school and one lesson in the middle school in 45 minutes.
3. The three grades of the middle school require early self-study time, and they can listen to the English listening training programs of different grades at the same time.
Please design a plan and list the equipment list, and draw the system topology.
2. Demand analysis
According to the school's functional requirements of the campus broadcasting system and the results of field investigations, considering the long-term development of the school and the principles of economic practicability, the broadcasting system needs to be roughly analyzed as follows:
1. Realize addressable point-to-point control, that is, unified control and management of broadcasting of any grade or class. And each classroom can listen to the channel, switch, and power of the FM speaker at the classroom end without authorized management in the main control room. And control the volume separately.
2. The system has powerful full-channel and multi-channel output management functions. To achieve different regions to play or listen to different program content at the same time. The system requires at least 6 different digital audio sources to be output at the same time. For example: 3 schools Grades require early self-study time and can listen to different English listening training programs in their respective grades.
3. Arbitrary grouping and partition broadcasting function. According to the different regional functions, the district can be controlled on the campus, such as the playground, office building, campus outdoor, dormitory, etc.
4. Require timing, automatic broadcast at fixed point. Fully realize 24 hours unattended.
5. Musical bell ringing and background music playback. The system requires that the primary and secondary schools have different work and rest times. A 40-minute class in elementary school and a 45-minute class in middle school require that the music ringtone be played separately and automatically played.
6. This set of campus intelligent broadcasting system also has the function of teaching. (Such as language teaching, English listening training, etc.).
7. The overall project wiring specification, the system equipment selection is reasonable, the operation is convenient, meets the development needs of the school, and the interface is reserved for the school's expansion.
3. Scheme design
Each school has different functional areas, such as teaching area, office area, dormitory, playground, canteen, library, etc. The functional requirements of the broadcasting system in each area are also different. According to the functional requirements and field of your school The inspection results, considering the future development of the school, the expansion of the broadcasting system, etc., the school intelligent FM zone broadcasting system we designed is as follows:
1. Each classroom in the teaching area is designed with an addressable FM broadcast system. The front end of the system uses the American PBI agile audio modulator (adjustment range 87MHZ ~ 108MHZ). According to the characteristics of the 9 grades of the school, the 3 grades of the middle school require early self-study Time, you can listen to different English listening training programs of different grades at the same time. The system temporarily sets up 6-8 sets of program sources; the classroom side uses Beijing Jinmai Video GMTD-FM8A addressable full-channel FM speakers. The speaker reception frequency is continuously adjustable from 87MHZ to 108MHZ, which can simultaneously receive more than 60 sets of programs, each speaker Equipped with a remote control, the classroom side can set the received frequency through the remote control, switch the frequency, adjust the volume, switch the power supply, etc. At the same time, the speaker has a microcomputer control module to achieve fixed-point and free group broadcasting through the main control system.
2. The system adopts a multi-channel digital playback control host that can broadcast multiple sets of different digital audio programs at the same time, satisfying the multi-year level, multi-lingual simultaneous voice teaching or English listening test and training, and different programs simultaneously playing in different areas. For example; the sixth grade of the elementary school and the three grades of the junior high school can play or listen to their different English listening exams and training content at the same time. In addition to the 6 sets of programs on the terminal, there are also three grades for the middle school, each grade is allocated A deck to meet the listening problems of listening to tape playback in early self-study time.
3. The broadcast control center is located in the original broadcast control room on the first floor of the West Teaching Building. The overall broadcast system is controlled by computer. The control host controls the FM speaker and partition controller through RS485 control bus to achieve intelligent broadcast control. At the same time, the control host can realize multi-channel digital audio automatic playback to meet the needs of primary and junior high school simultaneous digital audio broadcast.
4. The stadium (playground) because its broadcasting is mainly used for various games, sports games, radio exercises, and physical education classes, a separate broadcasting system is often used to facilitate the on-site interpretation, awards, and broadcast of various games 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 large 400-meter playground design uses six 60W outdoor rain soundproof columns.
5. 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.
4. Main functions
1. Auto play, timed play, fixed point play, group play, partition play, loop play, remote play, stereo play
2. Multi-channel programs are played at the same time, and the schedule is scheduled to play
3. Large playback capacity, play multiple file formats
4. Partition control, addressing control, power control
V. List of system equipment
Equipment name specification and model number
Main control system GMTD-BCD multi-channel digital playback control host (can broadcast multiple different audio sources at the same time), multi-channel digital broadcast main control software, automatic broadcast software, professional sound card, etc
Partition Controller GMTD-8DV Jinmai Video 1
Audio modulator US PBI-3000FM (one program source with one) 6
Mixer US PBI-4016C1
Trunk amplifier 550 trillion 1
Preamplifier GM-8601A1
Combined constant voltage amplifier GM-8360A (360W) 1
Broadcast control cabinet standard 1.8 m 1
Microphone BK-2403
Deck GM-8622S4
DVDGM-8621T1
Addressable FM speaker GMTD-FM, 60 programs, full channel reception, full function remote control 54
Outdoor luxury sound column GM-318 (30W) all-weather rain and moisture (for outdoor playground area, etc.) 6
Cable network cable, audio cable, power cord, system connector
Trunk PVC
System total quotation: Yuan If you need a price list, please call our company consultation hotline
6. System Topology
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