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With the rapid development of computer technology, network technology and digital audio technology and the widespread application in the field of education, the pace of construction of educational informatization is accelerating, and the changing teaching methods are gradually blending with the development of modern science and technology. Since the beginning of the 21st century, China's accession to the WTO, the continued high growth rate of the national economy has attracted worldwide attention, and international exchanges have become more frequent, so the quality of foreign language talents has put forward higher requirements. The foreign language radio station is an important means for colleges to carry out foreign language listening training and exams of grades 4 and 6. It is also the most effective way to improve the quality of college students ’foreign languages. The traditional foreign language radio station has serious lags in technology and application, which can not be connected with modern information construction. The construction of digital, networked and intelligent foreign language radio stations has become an urgent requirement for foreign language teaching in major universities.
The lag of traditional foreign language radio stations is reflected in:
Deck and VCD are the main audio playback equipment, which can only play analog audio sources such as magnetic tapes and compact discs, making digital audio sources representing the trend useless;
The sound source is what it is, it cannot be digitally edited and synthesized according to the needs, and the sound quality is dry and no layering;
The manual manual play mode requires a dedicated person to control the play regularly and at a fixed point, which consumes human resources and cannot achieve centralized intelligent management of the equipment;
The FM transmitter uses a common FM modulation circuit, which is easy to cause frequency drift due to temperature changes;
The FM headset uses a knob to simulate the search, which cannot accurately lock the frequency and is inconvenient to adjust;
Due to the existence of the above factors, the application and development of foreign language radio stations in teaching has been greatly restricted. According to the actual demand and development direction of the university's foreign language radio listening, we actively explore, carefully study, and repeatedly experiment, and use high-tech science and technology to develop a university foreign language number that integrates "digitalization, networking, and intelligence" with the domestic first-class level. Radio audio automatic playing and intelligent control system.
Technical solutions
1. 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 examinations in Chinese colleges and middle schools, Stellar Science and Technology, combined with the current situation and development direction of foreign language radio stations on campus, uses Delphi programming technology, VC programming technology, single chip technology, PLL microcomputer phase-locked loop technology, analog digital display technology , Developed HX-8000 university foreign language digital audio radio automatic play and intelligent control system. The system is independently developed by the company, has independent intellectual property rights, and integrates "digitalization, networking, and intelligence" into a university foreign language radio system. 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. Design planning and design basis
The design of this plan is based on the principle of unification of "advanced, scientific, intelligent and economical", and is planned as a digital intelligent foreign language radio station of "digital editing broadcast, intelligent control management, digital display FM reception".
The formulation and design of the plan, in accordance with relevant national documents, standards and regulations, mainly include:
1. National standard "GB-4211 1-84 FM Broadcast Transmitter Standard";
2. Ministry of Radio, Film and Television "GY15-84 FM Receiver Standard";
3. MPEG-1 "ISO / IEC11172" audio coding standard;
4. "Relevant Specifications for Electrical Design of Civil Buildings" GBJ / T16-1992
5. "Professional Recording Structure Standard";
Third, the design plan
(1) System principle and composition The system adopts a new concept of "digital editing broadcast, intelligent control management, digital display FM reception" to build a digital intelligent university foreign language radio station. Output single or multiple audio signals from HX-8000 digital program source or analog program source, switch the output via VAS series audio matrix switcher, send to HX-2000 FM broadcast transmitter to modulate to different FM carriers and perform power synthesis and amplification, Microwave transmission is carried out through a high-frequency feeder to a high-gain double-layer cross antenna, and digital display frequency-locked headphones are used for listening. At the same time, the control signal is communicated by the control computer through the RS-232 serial port to the HX-7000 power supply intelligent management controller, 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 audio source can be recorded, edited and synthesized by the GB2000 audio editing software.
The system is mainly composed of digital hard disk multi-channel broadcast host (dedicated industrial control PC), digital hard disk multi-channel audio automatic broadcast software, audio editing software, power supply intelligent management controller, FM broadcast transmitter, digital display FM headset.
(2) System schematic diagram (see Figure 3)
(3) Detailed introduction of the plan
1. Audio playback and switching Foreign language listening training and examinations in colleges and universities are very important in foreign language teaching. Especially in recent years, foreign language learning has been heated up, making foreign language listening more visible. 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 HX-8000 digital hard disk multi-channel audio automatic playout system and VAS audio matrix switcher developed according to actual needs after many investigations and investigations as the sound source and switching equipment of foreign language broadcasting stations. This combination enables lossless audio transmission, realizes multi-channel audio timing automatic playback and switching output, and achieves the digitization, intelligence and automation of audio playback, making the broadcast audio sound clear and ensuring the quality of the radio station broadcast audio.
The following is an introduction of the equipment and software used:
â—† HX-8100 digital hard disk multi-channel broadcast host
The HX-8100 digital hard disk multi-broadcast host is a hardware device for digital audio playback. This device is composed of a P4 processor, 256ROM memory, a large-capacity hard disk of 80GB or more, and a high-power high-reliability redundant power supply to ensure that the system is normal for a long time Operation; use professional audio card, use software to separate left and right channels, so that one card can output 4 channels of sound source, the output is stereo, beautiful sound quality; use standard industrial control chassis, good heat dissipation performance, make the system work at room temperature, stable and reliable , Will not crash due to the high temperature in the chassis; the hard disk has more than 2000 tracks and commonly used audio material library.
â—† HX-8000 digital hard disk multi-channel audio automatic broadcast software â‘ Overview
HX-8000 digital hard disk multi-channel audio automatic broadcast software is a digital audio playback system that integrates digital audio multi-channel playback and peripheral intelligent management control, developed in response to the actual needs of college foreign language listening teaching. All-digital method is used to store and play audio signals, which is used to replace traditional audio cassette playback equipment such as tape cassettes and CDs. A large-scale intelligent broadcasting system can be established through a local area network, and a "digital, networked" audio broadcasting system of "digital high-quality recording, digital nonlinear editing, and digital automatic broadcasting" can be built. Peripherals such as power amplifiers and FM transmitters can also be controlled through software and serial ports. It can be widely used in residential areas, supermarkets, parks, shopping malls, squares, stations, docks, industrial and mining enterprises, hotels, hotels, hospitals, troops and other audio automatic playback occasions.
â‘¡Hardware requirements of system operating environment: computer above 586, memory above 32M.
Operating system: Windows95 / 98/2000 / NT / XP or higher.
â‘¢ Features of this software
l Support a host of eight-channel audio source timing automatic or manual playback;
l Support automatic timing, manual play switching and full call broadcasting;
l Supports scheduled playlists for each channel by day, week, month, and year;
l Support eight-way peripheral power supply automatic control and manual control management;
l Support multi-channel sound card left and right channel isolation, output stereo;
l Support the function of time signal of each channel;
l Support automatic switch on and off every day;
â—† VAS audio matrix switcher
VAS series audio matrix switcher is an audio input and output switching device specially designed for college broadcast systems. The device uses international popular patches, IC chips, single-chip circuits, professional modeling design, and is particularly suitable for multi-channel audio in various broadcast systems. Switch occasions. The audio matrix switcher is divided into three specifications (8 in 4 out, 8 in 8 out, 16 in 8 out), which can be selected and used according to the number of audio source switching channels.
Features
l Touch button design, easy to operate;
l Professional IC chip, single chip microcomputer control, broadcast level indicators;
l Input RCA interface (1.0Vp _p), input impedance 600Ω;
l Output RCA interface (1.0Vp _p), output impedance 600Ω;
l & nbs
University foreign language radio multi-channel audio automatic broadcast control system program
Foreword