1. System Overview According to the requirements of foreign language listening training and examinations in Chinese colleges and middle schools in China, Haite Weiye adopts Delphi programming technology, VC programming technology, single-chip technology, PLL microcomputer phase-locked loop technology, analog digital display in combination with the current situation and development direction of campus FM radio Organic integration of technology, etc., developed the 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 in the country for its "advanced, economic, intelligent, and practical" features. It is the best solution for foreign language radio stations in universities and secondary schools. .
2. Features of campus FM radio system
2.1 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.
2.2 Intelligent control: integrates the existing single-chip programming technology, which can intelligently control the transmitter power supply according to the playback time of the software track, and realize the unattended intelligent management control of the transmitter power supply, overcoming the difficulty of intelligent management of foreign language radio stations.
2.3 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.
2.4 Free listening: support various radios, FM earphones, etc. in the domestic market for listening anytime, anywhere.
2.5 Diversified audio: Supports the playback of audio files in various formats (tape, CD, MP3, CD, MIDI, WAV, etc.), which enables a wide range of sound sources to be selected, and can use the existing various sound sources to improve the students' listening ability in foreign languages.
2.6 Digital editing: It supports digital recording, editing, synthesis, and effect processing to facilitate the production of foreign language courseware and audio files for foreign language listening training.
3. The design of campus FM radio system
3.1 Audio playback and switching part design The SB2010 campus FM radio automatic broadcasting system and VAS audio matrix switcher developed according to actual needs after multiple investigations and investigations are used 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.
3.2 Audio editing unit 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 effects are diverse and professional.
3.3 Peripheral power supply intelligent management control SB2010C power supply intelligent management controller can combine multimedia playback with peripheral control, and can automatically control the power switch of the transmitter according to the playback time.
3.4 FM radio transmission JG brand FM radio transmitter developed by domestic advanced technology to ensure stable and reliable transmission frequency, clear and thick sound quality.
4. Principles of Campus FM Radio System 4.1 Principles of Campus FM Radio System The SB2010 digital program source or analog program source outputs single or multi-channel audio signals, which are switched and output by the mixer and sent to the FM broadcast transmitter to be modulated to the FM carrier and proceed Power synthesis amplification, wireless transmission through the high-frequency feeder to the transmitting antenna antenna, using digital display frequency-locked headphones for listening. 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.
4.2 Schematic diagram of campus FM radio
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