【作者】 尹西林；

【导师】 刘卫忠；

【作者基本信息】 华中科技大学 ， 微电子学与固体电子学， 2006， 硕士

【摘要】 本文通过对当前数据广播中存在问题和数字视频广播(Digital Video Broadcasting,DVB)传输协议的分析,设计了基于对象轮播(Object Carousel,OC)的数据广播资讯系统的从发送端到接收端的解决方案,并阐述了整个系统的设计思路、发送端与接收端的软件结构和具体实现过程。在详细说明对象轮播的语法结构的前提下,包括数据下载块(DownloadDataBlock,DDB)消息、信息下载指示(DownloadInfoIndication,DII)消息、服务下载初始化(DownloadServerInitiate,DSI)消息和下载取消(DownloadCancel,DC)消息的语法结构,分析对象轮播数据以及信息的封装过程,同时说明在MPEG-2(Move Picture Expert Group,MPEG)传输流(Transport Stream,TS)中如何方便快速的定位对象。结合嵌入式浏览器的传输模块的需求,设计一种对象轮播传输模型,保证嵌入式浏览器良好的交互性,可同时响应多个传输请求。在数据广播资讯系统中嵌入式浏览器重要的功能之一是解析并显示HTML (Hyperlink Markup Languange)网页,实现这一功能的模块包括:传输模块、缓存管理模块、解析模块、排版与显示模块、人机交互模块和系统资源管理模块。通过研究缓存淘汰策略以利用有限的内存缓存空间,有效提高了嵌入式浏览器的网页访问速度。借鉴文档视图结构,浏览器实现了数据操作和数据显示的分离,增强了浏览器各模块的独立性,为提供灵活、方便的人机交互方式,浏览器实现了有效的焦点管理和快速焦点查找。更多还原

【Abstract】 In this paper, we pointed out the defect in current data broadcast and analysed the DVB transport protocol, then we designed a scheme of information broadcast system based on object carousel, and described the design of the overall system, software structure of front-end and terminal, and their implementation.With introduced of syntactic structure in the object carousel transport protocol, includes DownloadDataBlock、DownloadInfoIndication、DownloadServerInitiate and DownloadCancel message. After analysed the encapsulation process of the data and information that packed in object carousel transport protocol, and then explained the method that orientation object quickly. With the demand of the transport module in browser, designed a viable model in object carousel transport, so browser can provide a viable alternation and response to many transport request at the same time.Parsing and displaying HTML document is one of important functions of embedded browser. The modules to realizes this function include: Transporting module, parsing module, human-computer interaction module. We adopt memory cache to buffer the important data in browser, and designed reasonable and valid cache replacement algorithm. In this way, the speed of web browsing is improved. Within the document-view architecture,Browser separates data operation with displaying, and enhances module independence. To provide friendly human-computer interaction, Browser accomplish management and rapid focus seeking for hyperlink.更多还原