Research And Imple Mentation Of Multi-terminal Interactive Slide Demonstration System

With the popularization of higher education,the scale of enrollment in colleges and universities continues to expand,and the number of college students shows a trend of sustained and rapid growth.In order to alleviate the contradiction between the huge student groups and the shortage of teaching resources,many colleges and universities adopt a large class teaching method in some public foundation courses.However,there are two defects in the process of slide presentation in large classroom.Firstly,students who sit in the back may not be able to see the contents of the slide due to the size of quantity of the projection screen,and lost patient and interest in the content of course.Secondly,most students can not interact with teachers timely and effectively because of the restriction of distance and human numbers,which reduce the interest of students and the quality of teaching.Aiming at the above problems,this paper investigated the development of electronic slides,and discussed the relevant theoretical basis of interactive teaching.Widely used presentation tool has disadvantages,and teaching interaction is required in the process of large scale teaching demonstration.According to these reasons,this paper proposed a solution of teaching demonstration and interaction based on POI parsing,Web real-time and audio processing technology,designed and implemented an interactive slide system which supports real-time demonstration on multi-terminals.The system can analyze and converse existing PPT files,and the slides can be controlled by the master terminal in the demonstration process,moreover the system also support the interaction of text,voice and whiteboard between teachers and students to facilitate multimedia teaching.The paper focuses on the following aspects:(1)In the demonstration,the paper analyzed the logical and physical structure of PPT files,implemented a parsing scheme of PPT files based on custom data source format,moreover this paper researched the technology of online slide playing so that the presentation can be adapted to play in multi-terminal.(2)In the interaction,the paper researched on relevant theories and model of interactive teaching,analyzed the needs of interaction between teachers and students in classroom scene,implemented a scheme of interaction between teachers and students b ased on B/S structure which solve the problem of insufficient of interaction in traditional multimedia teaching without increasing the cost of hardware.(3)In the performance,the paper designed a lightweight data source format,presented a new scheme of slide synchronization control based on pre loading data and instruction stream protocol.At the same time,the overall architecture of the system is layered and each module is designed independently.The system is equipped with third party cloud storage and cloud acceleration services which ensure the efficiency and save the flow.The experimental results showed that the system can conveniently complete the demonstration of multimedia slides and has good performance in cross-platform and real-time interactivity,which make up for the lack of teaching interaction compared with the commonly used slide presentations.