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This paper is devoted to explore media correlation and media synchronization in a composite multimedia document, the so-called navigated hypermedia document in our language learning system, to facilitate the multimedia authoring, presentation, and access. Two levels of media correlation in temporal, spatial, and content domains are investigated: syntactic level correlation and semantic level correlation. We devise a capturing mechanism to record all the media streams and relations between them, including voice and event streams, for replaying the lecturing in a form as close as possible to the original classroom experience. The syntactic level correlation is based on specific timestamps of the media stream and used to reconstruct the recorded lecture for synchronized presentation. Furthermore, to integrate media objects with specific segments within the media stream, some computed synchronization processes are required to discover semantic content of the media. The proposed computed synchronization techniques, including speech-event binding process for temporal domain, tele-pointer (i.e. cursor) movement interpolation and adaptable handwriting presentation for spatial domain, and erasing handling for content domain, will be addressed. Experimental results show that in the speech-event binding process 74% of speech access entries for accessible visualized events are found. The acceptable rate of human perception on tele-pointer movement is higher than 85% if time interval is selected carefully. Finally, the accuracy of erasing handling for content removing is about 71%.

O ver the past decade, emerging Web technologies have opened a new era for e-learning with techniques never before seen. Web-suitable HTML lectures can easily be created by instructors and readily accessed by students for selfpaced learning. However, this kind of self-guided learning is insufficient for the diverse learning needs of many different individuals. For example, materials required to learn a language differ from materials required in other domains.We took this into account when designing our system-the Web-based Synchronized Multimedia Lecture (WSML) project-which is designed for English and Chinese language self-learning. Before we further discuss the technology of our system, we would like to mention some of the factors needed for successful e-learning.

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