1. User requirements of campus FM radio
North China Electric Power University is a national key university directly under the Ministry of Education, and a key construction university of the National "211 Project". The school's research achievements in energy and power related disciplines, which are mainly national-level key disciplines-"thermal engineering" and "power system and automation", are at the domestic leading level, and the research results in some fields have reached international advanced or leading Level.
In order to improve the students' listening ability in foreign languages ​​and effectively carry out Level 4 and Level 6 examinations and training, the college leaders decided to build an advanced campus FM radio system integrating "automatic playback, intelligent control, wireless transmission, and free listening".
Second, the campus FM radio user needs analysis
With the rapid development of modern science and technology and information technology, the advent of the Internet and multimedia technologies, an era of "global integration and informatization" of the knowledge economy is coming, especially the international exchanges are getting closer and closer, and gradually connecting with the world. The education department raises higher requirements for training high-quality foreign language talents. How to create a better foreign language learning environment has become the first problem. The school's existing speech room has a small capacity, poor mobility, and many students. It is difficult to carry out simultaneous training and examination of foreign language listening. Foreign language radio stations have become a necessary choice. With the progress of the times and the development of science and technology, the original foreign language radio stations can no longer meet the growing teaching needs. How to build a digital, modern, and intelligent foreign language radio station to replace the traditional foreign language radio station's shortcomings, and finally achieve the use of modern means Teaching to improve the overall teaching level has become a problem to be solved from time to time.
According to the requirements of foreign language listening training and examination of colleges and universities in our country, and combined with the current situation and development direction of campus FM radio stations, HiteWeiye adopts Delphi programming technology, VC programming technology, single-chip technology, PLL microcomputer phase-locked loop technology, analog digital display technology, etc. , Developed SB2010 campus FM radio automatic playback and intelligent control system. The system is independently developed by our company and has independent intellectual property rights. It is a foreign language radio system that integrates "digitalization, networking and intelligence". It has the unparalleled advancedness and superiority of traditional foreign language radio stations. It has been recognized by many colleges and education colleagues across the country for its "advanced, economic, intelligent, and practical" features. It is the best solution for foreign language radio stations in universities .
3. Features of campus FM radio system
3.1 Automatic playback: You can set the timed playback setting of the playback track in units of weeks according to your needs. After the setting is complete, the program will be automatically broadcast regularly, which realizes the automatic playback of campus FM radio stations.
3.2 Intelligent control: integrates the existing single-chip programming technology, which can intelligently control the transmitter power according to the playback time of the software track, realize the unattended intelligent management control of the transmitter power, and overcome the problem that the foreign language radio cannot be intelligently managed.
3.3 Wireless transmission: The domestic high-quality microcomputer phase-locked loop solid-state transmitter is used as the core transmission device, which has the characteristics of stable transmission and no frequency drift.
3.4 Free listening: support various radios, FM earphones, etc. in the existing domestic market for listening anytime, anywhere.
3.5 Diversified audio: Supports the playback of audio files in various formats (tape, CD, MP3, CD, MIDI, WAV, etc.), which enables a wide range of audio sources to be selected, and can use the existing various audio sources to improve students' foreign language listening level.
3.6 Digital editing: It supports digital recording, editing, synthesis, and effect processing to facilitate the production of foreign language courseware and foreign language listening training audio files.
4. Campus FM radio system design
4.1 Design of audio playback and switching
School foreign language listening training and exams are very important in foreign language teaching. Especially in recent years, foreign language learning has been heated up, making foreign language listening more obvious. As the core part of the foreign language radio station, the audio playback and switching part plays a vital role in the sound quality effect of the station broadcasting. The choice of audio source will directly affect the broadcast quality and listening effect, so the selection of a good audio source and intelligent broadcast system has become the primary issue to be considered in the construction of foreign language radio stations.
This plan adopts the SB2010 campus FM radio automatic broadcasting system and VAS audio matrix switcher developed according to actual needs after many investigations and investigations as the audio source and switching equipment of the campus FM radio. The combination enables lossless transmission of audio, realizes multi-channel audio timing automatic playback and switching output, and achieves the digitization, intelligence and automation of audio playback, making the audio quality of the broadcast clear and ensuring the quality of the audio broadcast on the campus FM radio station.
4.2 Audio editing unit
Some audio materials need to be entered or edited. For example, the selected materials need to be added with explanations and notes during the examination, and the recording of the foreign language examination teacher, etc., must be realized by a professional audio editing system. Digital audio editing software and MAYA PRO audio capture card is a powerful combination of audio editing and input, which makes the audio quality of the input audio clear, and the editing effect is diverse and professional.
4.3 Intelligent management control of peripheral power supply
The centralized control and management of foreign language radio peripherals has always been a problem that circumvents the management of foreign language radio stations. Although some devices can use the single-chip timer control switch, they cannot effectively connect with the computer broadcast audio to achieve intelligent management control of the peripherals, so that the equipment can work together Save power. SB2010C intelligent management controller is a classic work that combines multimedia playback and peripheral control, which realizes the effective integration of digital media playback and peripheral control management and centralized intelligent control management of peripherals.
4.4 FM broadcast transmission
FM broadcast transmitter is the core equipment of broadcast transmission, which affects the sound quality of the transmission. This program uses the JG brand FM radio transmitter developed by domestic advanced technology to ensure stable and reliable transmission frequency, clear and thick sound quality.
5. Principle of campus FM radio system
5.1 Principles of Campus FM Radio System
The system uses the new concept of "digital editing broadcast, intelligent control management, digital display FM reception" to build a digital intelligent foreign language radio station. Single or multiple audio signals are output from the SB2010 digital program source or analog program source, and the output is switched by the mixer, sent to the FM broadcast transmitter, modulated to the FM carrier and power synthesis and amplification, and wirelessly transmitted through the high frequency feeder to the transmitting antenna Transmit, use digital display frequency lock earphone to listen. At the same time, the control signal is communicated with the SB2010C intelligent broadcast host through the RS-232 serial port, and the power of the transmitter or external audio equipment is intelligently controlled according to the timing of automatically playing the audio file time. The digital sound source broadcasted can be recorded, edited and synthesized by AUDIOATION3.0 audio editing software.
The system is mainly composed of digital broadcast control host, intelligent broadcast software, audio editing software, intelligent broadcast host, dual deck, digital tuner, DVD, mixing console, FM broadcast transmitter, transmitting antenna, feeder, and FM headset.
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