Campus wireless broadcasting system solution
I. User needs
In order to meet the needs of campus management and the construction of a digital campus, it is now necessary to build a campus broadcast set. Since the school has been built for many years and the road surface is hard, wiring is very inconvenient. Consider the construction of campus radio broadcasting. The specific requirements are as follows:
1.1 Requires the system to automatically play class bells at regular intervals.
1.2 The system is required to be able to insert revelation of enlightenment, chant songs by teachers and students at any time.
1.3 There are 3 teaching buildings with 5 floors each. It is required to broadcast to each classroom / group of classrooms separately.
There are two 1.4 dormitory buildings, each of which has 7 floors. It is required to be able to play campus bells.
1.5 canteens, requiring teachers and students to play background music while dining.
1.6 It is required that the outdoor radio in the school's public activity area and dormitory area can listen to the radio.
User demand analysis
The school is a key middle school. The function of intelligent broadcasting mainly focuses on maintaining school order and listening training. After investigation and analysis, the smart FM broadcasting solution we designed for our customers is as follows:
1. The entire broadcasting system is designed as a campus wireless addressable intelligent broadcasting system. According to the requirements of the school, we design and adopt wireless FM broadcasting, so that it is convenient for construction, and will not damage the existing road surface and decoration environment, and save system construction costs.
2. Through the setting of the main control software, all classrooms can be grouped in any partition, and the playing time can be set uniformly or differently. Reach different grades or classes to play different content.
3. Install an indoor intelligent FM speaker in each classroom to meet the needs of ringing bells, foreign language examinations and listening training.
4. Install two indoor intelligent FM speakers in each dormitory corridor to maintain dormitory time.
5. Install 2 indoor intelligent FM speakers in each restaurant, and play background music when teachers and students eat.
6. In case of emergency, temporary broadcasting is required. The main control room can immediately end the automatic broadcast and broadcast the emergency broadcast.
Third, the campus wireless broadcasting system features
Adopt high-precision frequency phase-locked loop FM broadcast transmitter. The entire campus radio broadcasting system does not require pole pole wiring and is simple and convenient to install.
It can be set to play the worksheet every Monday to Sunday, and automatically broadcast the ringtones for class, background music, radio gymnastics, song ringtones and so on. The system automatically plays according to the set program, and truly realizes unattended operation.
Digital audio editing:
Adopt the current advanced digital audio workstation as the host, digitize audio signals, recordings, and line signals, and be compatible with multi-format digital signals in MD, DVD, MP3 and hard disks, and edit into complete high-quality broadcast programs according to program requirements .
Remote speakers, addressable point-to-point broadcasting:
Using the most advanced digital coding at present, the remote control speaker is automatically turned on and off to ensure accuracy. 128-zone (area) speakers can be automatically addressed to point broadcast (expandable to countless zones). The receiving end requires no manual operation and has a strong audience.
Foreign language listening teaching and examination functions:
The foreign language hearing data can be saved to the computer's hard disk, and stored in pure digital audio format (MP3, WAV, DAT, MEPG, AVI, etc.), and can be played according to the preset time and content. In the foreign language class, you can use this system for listening training. You can also choose the same district and the same grade for the foreign language listening test. During entertainment and leisure, you can play entertainment foreign language programs such as foreign language songs and news. Level of foreign language listening.
Forced insertion function:
Emergency broadcast notifications for emergencies can be inserted at any time. Expandable telephone emergency broadcasting, you can dial in the phone, enter the user name and password, turn on all speakers, and perform remote emergency broadcasting.
Within the effective range covered by the FM signal, countless FM receiving speakers can be used.
Design of campus wireless broadcasting system
4.1 Wireless campus broadcast sound source design
The wireless campus broadcast sound source is composed of computer sound source, deck, DVD, digital tuner, microphone, mixer and so on. Users can choose one according to the actual situation: configure one card holder for tape playback; configure one DVD for VCD, CD, DVD, MP3 and other optical disk playback. A digital coordinator is configured to broadcast the programs of the Central People's Broadcasting Station and local radio stations; a single mixer is configured, all audio sources first enter the mixer, and then enter the transmitting device for transmission through the mixer. The configuration can make all the sound source devices have a systematic and unified management, and can also adjust the volume of the sound source being played and the tone color correction of the analog sound source.
4.2 wireless campus broadcast editing design
The audio editing software and computer are combined into a digital audio workstation, which digitizes audio signals, recordings, and line signals, and is compatible with multi-format digital signals in MD, DVD, MP3, and hard disks, and edited into complete high-quality broadcasts according to the requirements of the program program.
4.3 Wireless campus broadcast broadcast control design
The digital intelligent controller and computer are combined to intelligently and automatically control the campus wireless broadcast. With coded remote control, you can freely control the broadcasting of a certain point or area on the interface, and you can also control it manually.
4.4 Wireless Campus Broadcasting Design
The FM radio transmitter used in the campus radio broadcasting scheme is a high-quality transmitter that has been produced by the National Radio Commission and has been approved for production. It adopts advanced technologies such as microcomputer phase lock, flash storage, digital error correction, and switching power supply. In particular, its front stage uses the most advanced dual-frequency lock-frequency subcarrier remote control coding technology with accurate and stable frequency, and the remote control speaker is turned on and off reliably, ensuring that the broadcasting system can run stably for a long time.
4.5 Campus wireless broadcast receiving design
The outdoor FM sound column with crystal frequency stabilization processing is fully protected against rain and dust, which is suitable for broadcasting in outdoor places. Indoors use indoor smart speakers to listen, or use "FM receiver + ceiling / wall-mounted speakers" FM to constant pressure listening.