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With the rapid development of network technology, video conferencing has been gradually integrated into people's life and work, providing a fast and intuitive communication method for users in different places, and has been used in government departments, telemedicine, telemonitoring and distance education. has been more and more widely used. This article will introduce the application of video conferencing in distance education.

Requirements for video conferencing in distance education

A general video conference can meet the needs of the conference as long as the interaction of video and audio can be well completed, and a small amount of data transmission can be completed at the same time. Although the real-time teaching system of distance education is realized based on video conference, it puts forward higher requirements for video conference. The video/audio provided first is of high quality. Because the video/audio information generated by the anchor classroom needs to be transmitted to the remote listening classroom through the transmission network, only high-quality video/audio information can ensure that the video image and sound can be truly reproduced in the remote listening classroom, thereby improving the teaching effect; It has strong data interaction capabilities. In the process of distance education, not only video/audio interaction, but also data interaction is more important, because teachers in the process of distance education teaching, in addition to using language to describe the teaching content, It is also necessary to provide students with a large amount of text content through electronic whiteboards, slideshows, application sharing and other means, so that students can see the teacher's blackboard writing, slideshows and other content in time, which puts forward the data interaction ability of video conferences. In order to facilitate students to review after class, teachers should send their own electronic lesson plans, learning materials, etc. to students before the end of each course. If the data transmission speed is higher Slow will inevitably affect the normal teaching progress.

Requirements for video conferencing in distance education 0

Auxiliary equipment based on distance education

In order to use video conferencing to carry out distance education, video conferencing should also be transformed to meet the needs of distance education, that is, adding some auxiliary equipment to improve the teaching effect of distance education. In the timely teaching system of distance education, in addition to the basic video conference camera and microphone, the host classroom should also include the following auxiliary equipment:

projector. In the distance teaching of video conference, most of the information obtained by students comes from vision, and its performance will directly affect the visual effect, which in turn affects the learning effect.

wireless microphone. When teachers and students are not face-to-face, the other main way for students to obtain information is through hearing. The real voice can make students feel comfortable and natural, and concentrate their attention. At the same time, it can ensure that teachers can still generate clear sound signals when they move freely in the classroom, so as to ensure that students in remote classrooms can hear the teachers' true and clear voices.

Electronic whiteboard. The electronic whiteboard is an important auxiliary information processing equipment in the video conference. On the surface, it is the same as the blackboard in the ordinary classroom. The difference is that the content written on the electronic whiteboard can be transmitted to the remote classroom through the video conference system. Students attending the class can see it. In distance teaching, the electronic whiteboard can not only replace the function of the original blackboard, but also can carry out interactive teaching through "written talk" between teachers and students. The electronic whiteboard and the video conference terminal are generally connected through an RS-232 serial line. The content written by the teacher on the whiteboard is processed by the whiteboard and turned into a data signal, which is sent to the video conference terminal. The conference terminal is transmitted to the remote classroom through the transmission channel, and then processed by the remote terminal device and displayed on the big screen.

Automatically track cameras. The automatic tracking camera is generally ensured by infrared remote control. When the teacher walks in the host's classroom, the teacher's picture will always appear on the screen. This allows teachers to move freely back and forth as they would in a regular classroom, without having to worry about stepping off the screen. Make teachers and students focus more on teaching and learning, thereby improving teaching efficiency.

Video Visualizer. In recent years, the video display table has become an important equipment in conference rooms and multimedia classrooms, and has gradually replaced most of the traditional film projectors and slide projectors. The video display stand can not only project the contents of slides and transparencies on the screen, but also project various objects, such as printed publications, three-dimensional objects, and even moving images, onto the screen clearly. The PC is connected to the Visualizer through the video capture card. Through the relevant program software, the video signal output by the Video Visualizer can be input to the PC for various processing, and can be transmitted to the remote classroom for lectures.

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