本文主要讨论了世界上流行的数字电视传输系统的组成和关键技术，研究了DVB系统的技术规范和性能特点。
This thesis mainly discusses the key technology and line transmission system of the popular digital TV in the world now, research DVB technical specification and performance characteristic of system.
就这3种数字电视标准，进行技术规范、标准参数及特点等方面的比较。
In this paper, the 3 different standards are compared in terms of technical specification, standard parameters and features.
使用这些封装的、规范的、可重用的软件组件，实现了一个公共的标准软件框架数字电视平台——数字电视中间件。
Take advantage of these packages, standardized, reusable software components, to build a common framework of standard software platform for dtv-digital TV Middleware.
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