I. User needs
We are a university with 125 classrooms. Due to the limitation of the decoration environment, the reception of foreign language radio signals is unstable, and the local radio management committee does not approve high-power FM transmitters for wireless transmission, which seriously affects our school's foreign language listening teaching and grades four and six. examination.
In order to completely change the plight of foreign language listening teaching and examination in our college, we decided to build a foreign language listening system that can use wired transmission and wireless forwarding in the classroom. Currently, we need to broadcast 4 foreign language listening programs at the same time. I hope your company will give you plans and quotes.
User demand analysis
With the rapid development of China ’s economy, China ’s accession to the WTO and international exchanges are becoming more frequent. There is a shortage of personnel with professional foreign language skills in China. Foreign language teaching facilities and methods are far from meeting the needs of society for high-level professional foreign language talents. It manifests in the following aspects:
Lack of foreign language teaching infrastructure in universities, schools, and schools;
Foreign language listening teaching methods are not flexible, and many schools only use the speech room;
Can't let students develop good English habits at an early age in the basic teaching stage;
Schools cannot create a language learning environment that combines open and free choices for students;
Foreign language teachers have varying levels of spoken English, leading to misinformation;
The above factors have caused the dumb English phenomenon of “only literate, not sound” in Chinese primary and middle school students. This phenomenon has seriously affected the improvement of our foreign language teaching level and hindered the cultivation of high-quality foreign language talents.
Beijing Hite Weiye Technology Co., Ltd. has designed a multi-channel foreign language listening wireless forwarding system to improve the listening and transmission of foreign languages in China. This system adopts the wired transmission and wireless answering methods. It does not need to apply for frequencies from the local radio management committee and allows the program to choose free listening. It is flexible and reliable. Students can gradually develop foreign language thinking and habits in the foreign language environment all day, and gradually improve Students' level of foreign language listening.
Third, the system features
The foreign language listening wireless repeater system is specially developed for schools with unique functions and incomparable advantages not available in traditional foreign language radio stations, as follows.
3.1 System functions:
Auto-play function: The system can simultaneously broadcast up to 1-12 foreign language programs through multi-channel audio playback software, which can realize manual and automatic timing playback. Users can store the English programs to be played commonly used in all grades on the hard disk to realize fully automatic non-linear broadcast. You can also set up the daily, weekly, monthly, and annual playlists to automatically broadcast unattended broadcasts of foreign language songs, foreign language news, and foreign language teaching programs.
Common cable transmission function: Up to 12 sets of programs can be transmitted simultaneously, which fully meets the needs of foreign language listening teaching and free listening. It adopts frequency division multiplexed common cable transmission mode. Closed-circuit television, campus broadcasting, and co-cable transmission using a coaxial cable do not require rewiring.
Wireless forwarding function: The classroom uses a wireless repeater to wirelessly forward foreign language listening programs transmitted on closed-circuit television, without the need to apply for a frequency, and super large-capacity multiple sets of programs are forwarded simultaneously. Students can listen to wireless headphones and radios in the classroom.
3.2 System Features:
Digital audio source: The system adopts multi-channel audio broadcasting system software, so that the audio source is not limited to the traditional analog audio source, can use MP3, CD, MIDI, WAVE and other audio formats as required, and can fully utilize foreign language listening audio in the Internet Resources, expanding the channels of teaching resources.
Automated broadcasting: According to the needs of college foreign language listening teaching and examinations, the specially designed and developed playback software can realize up to 12 sets of audio sources to set the playback time in various modes, automatically scheduled playback, and automatic switch on and off.
Intelligent control: The programmable power controller can intelligently control the power switch of the FM modulator according to the broadcast time through the setting of multi-channel audio broadcast software to achieve intelligent power-saving intelligent control.
Free expansion: Because the signal is transmitted by FM FM carrier weak signal, the wireless repeater only needs to meet the level requirements for receiving and forwarding, leaving a lot of room for expansion of the system. Adding a forwarding device is only required to be connected in the CCTV network nearby, and no cable is needed.
Design of multi-channel foreign language listening wireless forwarding system
4.1 System composition
The system adopts the working mode of "digital broadcasting, common cable transmission, wireless forwarding, and FM reception". It consists of a digital broadcasting control host and a multi-channel audio broadcasting system, an FM modulator, an adjacent frequency mixer, a wireless repeater, and wireless headphones .
4.2 Front-end and signal source: front-end multi-channel audio broadcasting system software broadcasts multiple digital foreign language listening programs, analog program sources (DVD, dual deck, digital tuner), FM-1500 FM modulator, audio matrix switching Device, adjacent frequency mixer, trunk amplifier, cabinet, etc.
4.3 Transmission method:
Signal common cable transmission: Multiple foreign language listening programs are transmitted using the original closed-circuit television network and closed-circuit television signals.
Wireless forwarding listening: The classroom uses wireless transponders to wirelessly forward the received multi-channel foreign language listening programs to achieve no blind spot coverage in the classroom.
4.4 Terminal receiving equipment and listening method: Students use wireless headphones or radio to listen.
Fifth, the principle of multi-channel foreign language listening wireless forwarding system
5.1 Principle of Multi-channel Foreign Language Listening Wireless Forwarding System
Computer technology, VC programming technology, FM FM frequency division multiplexing technology, and micropower wireless transmission technology are combined to transmit multiple (up to 12) FM radio programs from the broadcasting room to each classroom, and The wireless transponder simultaneously amplifies multiple foreign language listening programs at the same time with micro power amplification and wirelessly transmits them. Students use wireless headphones and radios to listen.