The Research And Implementation Of Multimedia Digital Terminal Based On S3C2410

With the development of multimedia digital voice technology, communication networks and the real time embedded technology, associating with the special characteristics of all kinds of school, we will build an efficient, security, multifunctional and multimedia digital voice classroom system. The system will provide an advanced multi-subject teaching environment and studying flat. It takes good use of vision and voice synchronization as the way of teaching. The accept efficiency of students can be improved by this means. It is the revolution in education environment which encouraged the information exchange between the teacher and the student, resources sharing and teaching cooperation. When the system uses Person Computer or proprietary chip, the high cost will baffle popularization and application of the digital teaching means. If we use the real time embedded technology, the cost of the system with all kinds of necessary functions will greatly reduce. Based of the real time embedded technology, the digital voice classroom system has the characteristics of small volume, high stable voice quality, good expansibility, low cost, abundant teaching means and flexible and changeable teaching method.On the basic of the existing multimedia digital terminal unit and embedded technologies, we introduce a new software and hardware architecture of multimedia digital terminal. In this model, we adopt S3C2410X CPU of high performanance ARM920T core, including LCD, serial ports, IIS, ADC etc. It adopts open source embedded Linux environment. On the basic of Linux driver, the GUI and VOD functions are realized by using optimizing data structure and arithmetic. At the same time, the methods of the related key problems are provided:1. The audio driver design uses multi-buffer which is flexible and configurable;2. The touch screen driver design supports dragging function;3. The SD card driver design resolves that the kernel is occupied too long by data request;4. Realizing PS/2 interface virtually by using S3C2410X general I/O port;5. The simple touching X/Y-position way to filter and calibrate program and to support MiniGui;6. Based on ARM9 architecture, we only discussed the optimization implementation of MEPG-4 primarily.All of them are provided a good supporting for the top layer. In the end, the conclusions and suggestions on system structure and performance are given out.