Home gateway is a bridge to connect the family scale network to the outside network . on the one side , it is a platform on which family users can access different kinds of services 它是连接内外的桥梁,一方面是使住宅用户可以获得各种家庭服务的平台;另外一个方面是家庭内部网络连接到外部的一种物理接口。
In the beginning , the dissertation gives an overview of digital video system and an introduction of the format of mpeg - 2 transport stream , mpeg - 2 physical interface and frame structure of ds3 stream 文章首先介绍了关于数字电视系统的一些基本概念, mpeg - 2传送流格式和mpeg - 2的物理接口,以及ds3码流的帧结构。
The p87c591 microcontroller with can controller chip was selected to realize the devicenet specification , and the pca82c250 can transceiver was used for connecting to the devicenet bus Devicenet通讯接口的硬件设计采用了philips公司的p87c591在片can控制器芯片来实现devicenet应用层协议，并用pca82c250can总线收发器实现到devicenet总线的物理接口。
Tds - ofdm and 3 digital television ground transmission standards overseas have the same exterior physical interface , and it has successfully solved dilemmas such as creating an independent standard and lower product costs Tds - ofdm和国外现有的3个数字电视地面传输标准具有相同的外在物理接口，成功地解决了自主标准的快速产业化和降低产品成本的难题。
The key technique is the adaptation of mpeg - 2 transport stream to ds3 format . based on an extensive and thorough study of the relative standards and specifications of dvb and itu , this dissertation discusses the adaptation process of mpeg - 2 physical interface to ds3 interface , and gives a detailed description of the implementation on fpga ( field programmable gate arrays ) 本论文正是针对上述问题,在广泛阅读和研究dvb和itu相关标准的基础上,讨论了系统发送端和接收端对于mpeg - 2物理接口和ds3接口之间的适配过程,并且对此适配方案在fpga (现场可编程门阵列)芯片上的实现进行了比较详尽的论述。
