I. Demands of users of automatic broadcasting and intelligent control systems for foreign language radio stations
North China Electric Power University is a national key university directly under the Ministry of Education, and a national key university for the "211 Project". The school's research achievements in energy and power related disciplines, mainly based on national key disciplines-"thermal engineering" and "power systems and automation"-are at the domestic leading level, and research results in some areas have reached international advanced or leading levels. Level.
In order to improve the students' foreign language listening level and effectively carry out Level 4 and Level 6 examinations and training, the college leaders decided to build an advanced foreign language radio automatic broadcast and intelligent control system system integrating "automatic broadcast, intelligent control, wireless transmission, and free listening". .
2. Analysis of user requirements for automatic broadcasting and intelligent control systems of foreign language radio stations
With the rapid development of modern science and technology and information technology, the emergence of the Internet and multimedia technology, a "global integration and informatization" knowledge economy era is coming, especially the international exchanges are getting closer and closer to 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 issue. The existing speech room in the school has a small capacity, poor mobility, and many students. It is difficult to conduct simultaneous training and examination of foreign language listening. Foreign language radio stations have become a necessary choice. With the development 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 digital, modern, and intelligent foreign language radio stations to replace the shortage of traditional foreign language radio stations, and finally use modern means Teaching to improve the overall teaching level has become a problem to be solved.
According to the requirements of foreign language listening training and examinations in China's colleges and high schools, combined with the current situation and development direction of campus FM radio, Hite Albert Technology adopts Delphi programming technology, VC programming technology, single-chip microcomputer technology, PLL microcomputer phase-locked loop technology, and analog digital display technology. , Developed SB2010 foreign language radio automatic broadcast and intelligent control system. This system is a foreign language radio system that is independently developed by the company and has independent intellectual property rights. It integrates "digitalization, networking, and intelligence." It has advanced and superior features that traditional foreign language radio stations cannot match. With its "advanced, economical, intelligent, and practical" features, it has been recognized by many universities and educational colleagues in the country. It is the best solution for the construction of foreign language radio stations in universities and middle schools. .
Function features of automatic broadcasting and intelligent control system for foreign language radio stations
3.1 Automatic playback: You can set the timed playback of the track to be played in weekly units as needed. After the setting is complete, the program is automatically broadcasted at regular intervals to realize the automatic playback of the campus FM radio station.
3.2 Intelligent Control: Integrate the existing single-chip programming technology, which can intelligently control the transmitter power according to the playing time of the software track, and realize the unattended intelligent management control of the transmitter power, which overcomes the problem that the foreign language radio station cannot be intelligently managed.
3.3 Wireless transmission: The domestic high-quality microcomputer phase-locked loop solid-state transmitter is used as the transmission core equipment, which has the characteristics of stable transmission and no frequency drift.
3.4 Free listening: Support various radios and FM headsets in the existing domestic market for listening anytime, anywhere.
3.5 Multi-audio: Supports playback of multiple formats of audio files (tape, CD, MP3, CD, MIDI, WAV, etc.), making a wide range of audio sources available, and using existing audio sources to improve students' foreign language listening skills.
3.6 Digital Editing: Supports digital recording, editing, synthesis, and effect processing to facilitate the production of foreign language courseware and audio files for foreign language listening training.
Design of automatic broadcasting and intelligent control system for foreign language radio stations
4.1 Audio playback and switching design
School foreign language listening training and examinations are very important in foreign language teaching. Especially in recent years, foreign language learning has been heating up, making foreign language listening more apparent. 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 sound source will directly affect the broadcast quality and listening effect. Therefore, choosing a good sound source and intelligent broadcast system has become the first issue to be considered when constructing a foreign language radio station.
This solution uses the SB2010 campus FM radio automatic broadcast system and VAS audio matrix switcher developed according to actual needs after multiple investigations and studies as the campus FM radio source and switching equipment. This combination enables lossless audio transmission, and realizes the automatic playback and switching output of multiple audio channels at regular intervals, achieving digitization, intelligence, and automation of audio playback, making the audio quality of broadcast audio clear, and ensuring the quality of audio broadcast on campus FM radio stations.
4.2 Audio editing unit
Some audio materials need to be entered or edited. For example, the selected materials need to be added with instructions, notes, and foreign language exam teachers' recordings, etc., which must be implemented by professional audio editing systems. Digital audio editing software and MAYA PRO audio capture card are a powerful combination of audio editing and recording, which makes the audio quality of the recorded audio clear, and the editing effects are diverse and professional.
4.3 Peripheral power intelligent management control
The centralized control and management of foreign language radio peripherals has always been a difficult problem for foreign language radio management. Although some devices can use the microcontroller to control the timing switch, they cannot be effectively connected with the computer's broadcast audio to achieve intelligent management and control of the peripherals, so that the devices work together. Save power. SB2010C intelligent management controller is a classic combination of 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 radio transmission
FM broadcast transmitter is the core equipment of broadcast transmission, which affects the transmission sound quality. This solution uses the JG brand FM broadcast transmitter developed by domestic advanced technology to ensure the stability and reliability of the transmission frequency, and the sound quality is clear and strong.
V. Principles of automatic broadcasting and intelligent control system for foreign language radio stations
5.1 Principle of automatic broadcasting and intelligent control system for foreign language radio stations
The system uses the new concept of "digital editing broadcast, intelligent control management, digital display FM reception" to build digital intelligent foreign language radio stations. Single or multiple audio signals are output by SB2010 digital or analog program sources, switched by the mixer, sent to the FM broadcast transmitter to modulate the FM carrier and power synthesis and amplification, and wirelessly through the high-frequency feeder to the transmitting antenna Transmit, listen with digital display frequency-locked headphones. At the same time, the control signal is communicated by the control computer to 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 broadcasted digital sound source can be recorded, edited and effect 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, mixer, FM broadcast transmitter, transmitting antenna, feeder, and FM headset.