论文摘要
随着数字技术、网络技术和多媒体技术的发展,广播电视系统正在全面向数字化的方向发展。在实现基于HFC(Hybrid Fiber Coax光纤同轴电缆混合网络)的电视网络数字化传输后,在电视网络中不仅可以传输视频、音频等信息,同时可以传输包括图像、文字、数据等各种信息在内的多媒体综合信息,这类广播业务与音视频节目毫无关系,是电视广播的新应用。本论文利用广播电视系统数字化后的这个新特点,利用DVB(Data Video Broadcast)标准中提供的DC(DataCarousel数据轮播)数据封装方法,论述了通过数字电视系统实现文字、数据等信息广播的技术问题。本论文所实现的数据轮播播发系统主要由两部分组成:数据库和传输接口。数据库是支持人机交互界面的,用于存储用户输入的各种数据信息;数据库在设计时分成多个模块,以适应不同的内容,并且不同的模块对应不同的界面,在这些界面中用户需要根据要求输入一些必要的信息,这些信息都是将来作为数据轮播的播发内容的;传输接口主要是为了将存放在数据库中的信息按照DVB标准的要求进行必要的整理和打包,这个过程总共需要三次数据封装,数据库中的信息经过这三次数据封装后将形成独立的TS流,为后面TS流的传输和复用做准备,换句话说,该传输接口就是衔接录入数据和传输数据的桥梁。对于生成的TS流使用现有的分析软件EPG_dump进行分析,各项结果都很正确,说明本论文采用的对轮播数据的封装方法是完全正确的。
论文目录
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