【作者】 白日昌；

【导师】 贾亮；

【作者基本信息】 沈阳航空航天大学 ， 信号与信息处理， 2011， 硕士

【摘要】 电子白板是将传统的教学方式与现代多媒体技术、计算机技术相结合的一种现代的多媒体教学工具,主要应用于课堂教学、大型会议以及现场演示等场合。这种方式利用无线的信号笔书写,摆脱了键盘和鼠标的束缚,使操作者能更加直观的将思想传递给大家。本次课题设计的电子白板系统由计算机、白板、信号笔、信号接收器、DSP信号处理系统和一台投影仪构成。基于DSP的电子白板系统可完成信号笔的无线发射和接收,并通过对超声波信号的采集、分析和判断等处理,实现了电子白板的基本功能。系统主要包括:超声波、红外线信号的发射和接受单元、DSP信号处理系统和计算机控制程序三部分。本文以TI公司生产的TMS320C5509型DSP芯片为核心处理器,较其它芯片在处理速度、运算精度和存储容量以及降低功耗处理上都有了很大的提高,并且在信号接收单元采用CX20106A检波电路对超声波信号进行分析和判断,与其它电子白板的设计相比较,不仅使软件设计过程简单化,也使整个系统成本大大降低,适合大面积推广。同时为了完成DSP与计算机的信息交互功能,运用TI公司生产的异步通信模块TL16C550来实现DSP与计算机数据的异步串行通信,并且利用Flash芯片AM29LV800和SDRAM芯片HY57V641620ETP芯片实现了存储器的扩展。论文最后主要是对系统进行优化和整体测试,通过各项调试结果证明了整个系统实现了电子白板的功能,基本达到了预期的效果。更多还原

【Abstract】 Electronic whiteboard is a modern multimedia teaching tools mainly be used in classroom teaching conferences and live demonstration and so on, which is combined of traditional teaching methods and modern multimedia technology, computer technology combining. Electronic whiteboard using the wireless signals pen, freed from the shackle of keyboard and the mouse. Make the operator can more intuitive will thought communicating to everyone. The design of interactive electronic board system is made up of computer, whiteboard, signal pen, receiver and DSP signal processing system.It was taked the TI company production TMS320C5509 DSP as the core processor, which is collecting, processing, analysising and judging ultrasonic signal.The processing speed, accuracy and storage capacity and reduce power consumption processing has improved a lot. System designs transmission and reception units of ultrasonic and infrared signal, it is realized the wireless transmission and reception of the signal pen. Signal reception units take CX20106A detection chip that analyze and judge ultrasonic signal. According to other electronic whiteboard, not only software design process is over-simplication, but also make whole system cost reduced greatly, so this product can accumulates promotion. At the same time in order to complete to interacte the DSP and computer information, it is uses TI company production asynchronous communication module TL16C550 to achieve data serial transmission of DSP and computer. And it is uses Flash chips AM29LV800 and SDRAM chip HY57V641620ETP to realize memory expansion.Finally paper introduces the system optimization and overall test, various commissioning results is proved the whole system realized the function of electronic whiteboard system base on DSP.更多还原