When schools choose campus intelligent broadcast products, they must first define their functional needs, and do not blindly pursue "the most advanced technology and the most powerful functions." New technologies are good, but they may not be useful for some users, and may even cause unnecessary trouble. When some manufacturers promote their products, they often highlight or even exaggerate the advantages of the products, avoiding some shortcomings and shortcomings. Therefore, when selecting products and technologies, we should compare them more. We can also use different advanced technologies from the three links of “sound source, transmission and terminal” to complement each other. In the following, different construction opinions are proposed with several different levels of user cases.

I. Construction of intelligent broadcasting in primary school campus

Demand analysis: automatic music ring, broadcast gymnastics, eye exercises, automatic broadcast, broadcast notification, broadcast to find people, campus radio broadcasts .

Construction Opinion: Selecting an economical and stable automatic constant pressure broadcast, for primary schools, only one program needs to be played, and constant pressure broadcast can be used to meet the requirements. In addition, the general primary school campus area will not be large, and the broadcasting line is relatively simple. For music ringtones, add an MP3 smart player (which can store about 30 minutes of music) at the front end to realize ringtones, eye exercises, automatic operation of broadcast operations, and automatic control of power amplifiers. The system's function and sound quality can meet the requirements of campus public broadcasting.

Second, the construction of intelligent broadcasting in middle school campus

Needs analysis: Middle school is generally three to six grades, not only requires the function of music bell and regular campus radio , but also requires foreign language listening teaching and exams, and to achieve different grades can play different programs at the same time, in function It must also be point-to-point addressable control to facilitate individual class training exams. Due to the use of foreign language listening training and examinations, the sound quality requirements of broadcasting are relatively high, especially in the middle and high frequency parts. The vocal voice requirements are clear, generous and have no background noise. The projectors are installed in the classrooms with good conditions, and the multimedia network terminals and notebooks are used for teaching. This requires that the classroom speakers should also have live sound reinforcement functions, and can realize local listening selection, volume control and other functions.

Construction comments: In view of the above requirements, it is recommended to use digital FM addressable intelligent broadcasting. Firstly, FM radio can fully meet the requirements of simultaneous transmission of multiple sets of programs in terms of program capacity. In terms of sound quality, FM radio distortion is small and can be transmitted in stereo. Campus FM radio only undergoes FM modulation - demodulation two links, if adopted High quality digital sound source, sound quality is completely guaranteed. In addition, the digital audio source is also beneficial to the automatic broadcast control of the broadcast software in terms of automatic broadcast and intelligent control. The hard disk can also realize the massive storage of thousands of audio files. The digital format audio file is also very easy to edit and process. .

In transmission, the FM broadcast can be transmitted in cable with the cable TV, and there is no need to separately broadcast the broadcast line. It can greatly reduce the construction amount, reduce the project cost, and adjust the frequency of the bus bus structure. It is also very convenient for system expansion.

In terms of intelligent broadcast and control, the intelligent broadcast software automatically broadcasts the same interface as the addressing control. The audio file hard disk is automatically broadcasted, and some softwares also have the function of simultaneously broadcasting multiple programs, and can automatically control peripherals such as audio matrix and radio head. Playlists can be created in multiple modes for automatic playback. Most manufacturers addressable coded control signals use SCA, FSK, MSK digital modulation methods. Broadcast, TV, and control signals are transmitted synchronously in a coaxial cable, enabling point-to-point addressing of terminal speakers. The speaker has a built-in decoding circuit that accepts commands from the main control software and performs actions such as power on/off, volume control, frequency selection, and signal switching.

The FM speaker is an active speaker. In addition to intelligent broadcasting, it can increase the field line input and microphone input, and it can be used for sound reinforcement in the classroom to realize multi-purpose.

Third, the construction of intelligent broadcasting on university campus

Demand analysis: University campuses are large in size, generally thousands of acres, and some universities are composed of multiple branches and campuses. University campuses are divided into different functional divisions. The function of campus broadcasting generally requires self-running programs for school broadcasting stations, without music bells, broadcasting exercises, etc., but because of the large number of functional partitions and large areas, different sections are required to simultaneously play different programs, and Students are required to listen to campus radio programs in different ways in different areas.

Construction Opinion: In the construction of university campus broadcasting , multiple transmission methods and multi-mode simultaneous broadcasting methods should be adopted. Cable broadcasting is used in the public areas of the campus, and the student dormitory and classrooms are covered by wireless FM radio. At the same time, the campus is used for live webcasting or on-demand.

Outdoor speakers and sound columns cover living areas, dormitory, canteen, lawn and other public places. If the constant voltage broadcast 100V constant voltage transmission mode is adopted, the wiring is difficult to construct due to the long distance and large power attenuation, and the cost is high. At present, there are CATV cable TV system networks on university campuses, and some schools use HFC photoelectric hybrid networks for transmission. In this way, it is recommended to adopt the "broadcast, television" two-network transmission mode. The broadcast signal uses cable frequency modulation and cable TV signal "co-cable transmission". After reaching different functional partitions, the audio signal and control signal are demodulated. The small range uses constant pressure transmission. Install an FM receiving control device in a building or a certain area, a constant voltage power amplifier, directly drive the constant pressure speaker, so that long-distance trunk lines can be omitted, construction difficulty and wiring cost can be reduced, and Multicast and addressable features.

For places that are not covered by public broadcasting or where public broadcasting is not convenient, wireless FM broadcasting can be used to cover. Most universities have foreign language stations, and foreign language radio transmitters can also transmit campus broadcasting signals. In this way, students can use FM headphones, radio to listen to or listen to campus radio programs.

In a university campus with a highly developed network, computers and networks are distributed throughout the campus for work and study. For teachers and students who cannot regularly listen to public and FM radio, they can use the network audio on demand method to broadcast daily. The content of the program is uploaded to the audio server, so that it can be listened to on any place after the end of the broadcast, or the live broadcast of the network audio can be used to realize online listening.

University campus broadcasting station, the center broadcast control room should use modern recording and broadcasting equipment, should set up a dedicated recording studio and broadcasting room, access the telephone hotline live, use professional digital audio workstations in the recording and broadcasting, to achieve recording, Edit, review, and broadcast all digitization. The broadcast of the program uses professional intelligent broadcast software to realize automatic broadcast and intelligent management.

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