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01-Applied Mathematics & Information Sciences
An International Journal


Volumes > Volume 06 > No. 6-2S


Using Script Command to Conquer the Narrowband Constraint in Synchronous Long-distance Teaching System

PP: 685S-695S
Wei-Chih Hsu, Cheng-Hsiu Li,
The applications of synchronous long-distance teaching (SLDT) are more and more valuable with the internet prevalence. One of the SLDT restrictions is the bandwidth consumption of the connection between teacherís side and studentsí sides. Even though most users use broadband network at present, there are still users using narrowband networks, such as dial-up and 3.5G network. It is very difficult to conduct SLDT in the narrowband network unless reducing the demands of network bandwidth consumption, especially while the teaching materials including video, audio, and so on. This paper proposes a novel scheme to reduce the network bandwidth requirement of SLDT efficiently. Original SLDT system transmits all teaching materials in full screen frames, so that it needs a great amount of network bandwidth. The proposed innovative technique encodes some of the teaching materials, including typing texts, messages on the electronic whiteboard, drawing pictures and timestamps into script commands. In this way, the encoded script commands are transmitted through the text channel of the multimedia streaming, while the audio and video channels carry the teacherís voice and images. When the studentsí sides receive the multimedia streaming, it is decoded back to the full screen frames. In this paper, the design of the encoder and decoder will be addressed in detail. The experimental results proved that our proposed scheme could reduce the demand of network bandwidth consumption efficaciously. Even at the dial-up and 3.5G network environment, studentsí sides could play the teaching frames very smoothly. That is, our implemented system could conquer the narrowband constraint and provide users to carry out SLDT in the narrowband network.

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