I. User needs
Our school was founded in 1950. It is a public primary school directly under the Haidian District Education Committee of Beijing. It is a Beijing science and technology demonstration school. It has 58 teaching classes, more than 2,500 students, and more than 140 teaching staff.
School construction broadcasting requirements:
Install speakers in each class to ring the bell regularly.
Install outdoor speakers in the playground to do broadcast gymnastics regularly.
The principal is required to speak through the campus broadcast system.
The school has 1 office building, which is a 6-story building. It is required to install speakers in the corridor of the office building and listen to campus radio.
The teaching area, office area, and playground area are required to be able to broadcast independently and broadcast at regular intervals.
User demand analysis
We design the primary school intelligent broadcasting system plan, which will be based on the "advanced, scientific and practical" guiding ideology. Set up a campus intelligent broadcasting system that meets the needs of primary schools, and achieve the overall goal of a new generation of intelligent broadcasting in primary schools that "multiple playback of audio sources, simple human operation, intelligent automatic playback, and easy expansion and maintenance."
3. Features of Intelligent Broadcasting System in Primary Schools
Play digital music:
With the use of computer multimedia technology, MP3, WMA, WAV and MIDI can play four common digital music files. You can obtain music files by purchasing music CDs, downloading from the Internet, or even recording yourself.
Scheduled playback and control:
When the system is in the automatic mode, it can automatically play at regular time according to the selected work schedule, and turn on the corresponding power and partition according to the settings.
Music instead of ringtones:
You can play beautiful music to replace the original dull electric ringtones and create a warmer park environment for the students.
24 hours unattended operation:
You can set the computer to start automatically at regular intervals. After Windows starts, the system will automatically start and enter the auto-play mode; when the last item of the schedule is played, the computer will automatically shut down.
Multiple sets of work schedule management:
Multiple sets of automatic playlists can be created and you can easily switch between schedules.
Add the background music function, you can specify the start and end time, loop and shuffle the background music.
Design of Intelligent Broadcasting System in Primary Schools
4.1 Front-end design:
Computers, decks, digital tuners, wireless microphones, broadcast microphones, etc. are selected as program sources, compatible with current multi-format audio programs, which expands the selection space for audio programs; the combination of campus intelligent broadcast software and intelligent broadcast controllers is used to make Elementary school campus radio has achieved "multiple audio source playback, simple human operation, intelligent and automatic playback, and convenient expansion and maintenance", which has improved the grade and standard of campus radio; the use of a constant-voltage amplifier with stable performance as an audio driving device has effectively ensured campus radio Stable and reliable operation for a long time.
4.2 Transmission Design:
It adopts domestic high-quality pre-amplified constant-voltage power amplifier as audio signal power amplification equipment, and 100V constant-voltage broadcast transmission on audio lines.
4.3 Terminal design:
Classrooms and office areas use wall / ceiling speakers, and outdoor speakers are used.
V. Principles of Primary School Intelligent Broadcasting System
5.1 Principles of Intelligent Broadcasting System in Primary Schools
The microphone, deck, DVD, digital tuner, and digital broadcasting host and other broadcast audio sources are output to the audio matrix switcher to switch the audio output and assign to the pre-amplifier. Then, the 110V / 70V high-voltage transmission method is used to transmit in the audio cable / power line. The ceiling / wall-mounted speakers and waterproof sound column receive the high-voltage audio signals, and after step-down processing, they are transmitted to the high, middle and low speakers, respectively, and the music Play it out.
The SB2010C intelligent broadcast controller communicates with the digital broadcast host through RS232. It can perform intelligent automatic management and control based on the broadcast time of the power supply with a fixed voltage amplifier. In order to automatically turn on or off the power of the different district power amplifiers according to the broadcast list settings. Intelligently control partition speaker playback.