The application of the broadcasting system on campus is very extensive. Every school needs to use radio to broadcast radio gymnastics, eye exercises, notices and ring tones. The wide application of computer multimedia technology has brought an epoch-making revolution to the campus broadcasting system. The functions of the campus broadcasting system are no longer limited to the functions of public broadcasting. The new demands of English listening teaching and examination in modern teaching rely only on traditional public broadcasting. Already not satisfied. The school has stable and reliable requirements for the broadcasting system, powerful functions, clear sound quality, convenient operation, automatic playback, point-by-point, zone control, and high degree of intelligence. The school hopes to tailor its own situation and specific requirements to provide personalized design services. At present, the broadcasting systems of our schools are very different. There are generally several types:
1. The computer room has a simple sound amplification device, the terminal uses a large barrel speaker, and the line uses a pull audio cable. Poor sound quality, single function, generally used in schools in remote mountains.
2, the machine room with constant pressure amplifier, mixer and other equipment, indoor terminal wall-mounted speakers, outdoor outdoor sound column, lawn speakers, etc., the line uses audio line. The sound quality is general, the wiring is cumbersome, the area is changed, and the addressing control needs to be re-routed.
3, the computer room with FM modulator, audio matrix and other equipment, the terminal uses a fixed frequency point FM speaker, the line uses CATV network transmission. There are many devices, which is not convenient for multi-channel playback. Partitioning, addressing control additionally provides a control line.
4. The wireless FM transmitter in the equipment room and the wireless FM receiver in the terminal use wireless transmission. It requires the approval of the non-committee, pays a certain fee each year, and is vulnerable to outside interference.
5, the computer room computer, the terminal uses an IP mode to receive the demodulation box, based on campus LAN transmission, but the cost is too high, the network speed and bandwidth requirements. The number of users is small.
6. The equipment room adopts frequency modulation mode, distributed multi-channel FSK data encoding transmission, and the terminal adopts multi-frequency automatic frequency conversion to receive FM speaker. The audio signal and the FSK addressing control signal are transmitted coaxially based on the existing CATV network of the school. Realize the "first line" and multi-network. The speaker uses a high and low frequency crossover 2-unit speaker, and the sound quality is almost CD.
In response to the current situation of schools around the country, the use of expensive networks to transmit broadcasts, and now the economic affordability is not affordable for every school. For schools that used to install fixed-pressure broadcasts, it was impossible to install the original products in a few years when the upgrade was over, and the functions could no longer meet the needs of modern teaching. At present, almost all schools have CATV networks. If you can make full use of the existing network, you can reduce costs and achieve multi-network integration and management.
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