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First, the campus IP network broadcast broadcast demand
 
1, each classroom, office, laboratory and multimedia room and playground as a single broadcast area, any one of the district radio music or speech;
 
2, according to the school schedule every week, can automatically scheduled fixed-point ringtones, rest time or after school can manually select the radio background music tracks, can control the volume size;
 
3, according to the needs of teaching radio, the deck, radio and other equipment into the IP network broadcasting system, the individual control the volume size;
 
4, can be requested to play the host to achieve automatic switching control computer, in the weekend time can automatically turn off the radio;
 
5, in the classroom to install the wall speaker, playground outdoor installation of waterproof speakers, outdoor teachers through the wireless microphone can be wireless radio speech;
 
6, the leadership or the teacher can remotely control the radio room equipment in the office power switch, touch screen microphone to the various room broadcast speech;
 
7, IP network broadcast area can be limited to meet the future needs of the school to expand the network broadcast site;
 
8, IP network radio can be in the control center server is closed or the server network software can also be closed to the case of intercom, paging call, background music player;
 
9, in some emergency situations (such as college entrance examination, in the examination, school games, etc.) control center server failure need to standby server for emergency switching, switching time is less than 20 milliseconds;

Second, the campus radio network broadcast overall design instructions
 
According to the user's needs, school broadcasts are broadcast on point-to-point IP network, and control can be broadcast for each classroom, every office and playground area. Teachers or students can take local control in the broadcasting control room or remote control in the office.
 
Campus digital IP network broadcast system can be divided into five parts: audio equipment, control equipment, signal amplification processing equipment, transmission lines and speaker systems.
 
Campus radio source equipment:
 
According to the requirements of the school teacher, campus radio can be achieved on the MP3 music file playback, CD / VCD and other CD player, tape player playing, etc., and microphone speech broadcast. Therefore, the system is equipped with a digital radio RH2813RF, voice dual deck RH2838K, DVD player RH2812CD, wireless microphone RH360U, wired microphone RH300MC, IP network paging microphone DM8300L.

Campus radio control equipment:
 
In order to achieve the automatic scheduling, automatic switching and automatic management of the campus, such as campus broadcast control function, so the system is equipped with IP network digital broadcasting host DM8100, does not affect in some emergency situations (such as college entrance examination, , School games, etc.) control center server failure need to standby server emergency switch, so add an IP network digital host DM8100, through the computer programming control partition, to achieve separate automatic switch, and the other to provide automatic management of power sequencing, pre-set Rest schedule, advance trigger and timed automatic control. Can realize the campus broadcasting system automatic switch machine.
 
Campus broadcast signal amplifiers and processing equipment:
 
Because of the large number of audio input devices, it is necessary to deal with the sound source signal and optimize the adjustment, to achieve the sound source signal quality adjustment, volume adjustment, etc. In addition, according to the number of signal source, decided to use audio matrix, audio distributor and other signal processing equipment , The system configuration pre-amplifier RH2811P, collecting audio signal, the amplification equalization process, the output to the network 60 group broadcast controller DM8200 transmission to each need to broadcast the partition point.

Campus radio transmission line:
 
The system uses constant voltage public broadcasting system, in addition to the audio output audio signal with RCA interface audio cable transmission, the power audio signal using 100V / 70V voltage transmission, the network terminal control signal using RS485 LAN transmission, power audio signal line and control signal line Respectively, using the bus connection, according to distance, applicable to the environment, select RVVS or RVV, RVVP and other power jacket line.
 
Campus radio loudspeaker:
 
In the campus radio system, no ceiling ceiling of the classroom or corridor using wall-mounted speakers; ceiling ceiling corridor or corridor using ceiling speakers; campus playground, canteen, gates and other areas to install outdoor waterproof column, green lawn on the installation Simulation mushrooms, stones and other lawn speakers.
 
Campus broadcast constant pressure amplifier:
 
Campus radio system amplifier is generally a constant pressure amplifier, the most important feature is a 70V and 100V constant voltage output terminals. For the campus broadcasting system, as long as the total power of the broadcast speaker is less than or equal to the rated power of the amplifier, but taking into account the line loss, aging and other factors, should be appropriate to leave the power margin. The rated output power of the campus radio amplifier should be about 1.3 times the total power of the campus radio loudspeaker.

Campus Broadcast Division:
 
Campus broadcast system is usually divided into a number of areas, according to the classroom, corridor, playground, office, etc. broadcast area, usually campus radio can automatically identify the regional network radio can point to point or point to the group play ringtones, automatic or manual partition broadcast control management.
 
Campus Broadcast System Subsidiary Package:
 
In the campus radio system, due to the outdoor installation of the column, need to consider the lightning protection and other factors, the installation of arrester can effectively solve the outdoor column by the lightning when the impact of high current on the amplifier; to ensure that the amplifier work, configure the main amplifier and standby power amplifier One and the main power amplifier switch one; taking into account the importance of campus radio, after a sudden power outage, can not automatically broadcast ringtones, so need to configure the UPS power supply; other ancillary equipment according to the need to add.

Third, the campus radio network broadcast advantage description
 
the advantages of network radio is two aspects, 1, program advantages, 2, technical performance advantages.
 The following are the same as the "
Advantages:
1, Webcast with the rational use of existing local area network, so that the implementation of webcasts more simple and effective. Reduce the wiring and labor costs, and the system is more flexible and convenient.
 
2, network broadcasting system to reduce the difficulty of the implementation of distributed layout, reducing the engine room load, no longer because the engine room power load is too large to consider carrying high-power equipment, electricity problems;
 
3, network radio system control center and radio sub-control center can also be arranged according to the actual situation in any need, as long as the network is smooth;
 
4, network public address system installation and debugging simple and quick, whether it is the construction of commissioning personnel or system operators, RH-AUDIO (Ruihuang) network public broadcasting at the beginning of the design have done a humane design, Installation and operation are simple and convenient.

Technical performance advantages:
1, network public address of the operating system is used in embedded systems, all embedded hardware to ensure the stability of the system reliability.
 
2,network public address system network delay is small, can achieve live broadcast synchronous call and music player, more suitable for more live music broadcasting and call requirements, regardless of music playback and broadcast voice calls, can Provide high quality sound quality. The system provides lossless CD quality and high quality compressed sound quality 2.
 
3, network public broadcasting system network equipment are interactive stackable architecture, can achieve the most simple system, you can also achieve the most complex broadcast requirements of the system.

4, network public broadcasting system perfect fire alarm function, with the fire system linkage, the network alarm matrix to provide fire drill function to ensure maximum fire safety. A variety of RH-AUDIO (Ruijie) equipment model provides a number of linkage interface: 24V, short-circuit signal, 485 signal to meet the various requirements of the use of functional requirements.
 
5, server and network software RH-AUDIO (Ruijie) network public broadcasting system, the best technical performance can be separated from the central server with the network broadcast software to run alone, even if the center to stop working or because the equipment problem can not work, the rest of our network equipment Are not affected by it, still broadcast and play background music.
 
6, network public web management: users through the browser can directly manage the entire network broadcast system, without installing any software, suitable for administrators in any location on the network broadcast system management (programming, distribution rights , Password modification, manual control playback, etc.). Administrators can use any computer over the network to make volume adjustments to a single terminal device or simultaneously to multiple terminal devices, play audio files, and so on.

Fourth, the campus network radio system configuration list

Fifth, the campus radio network broadcasting system connection diagram