【作者】 王厚荣；

【导师】 陈磊；

【作者基本信息】 北京邮电大学 ， 通信与信息系统， 2010， 硕士

【摘要】 随着网络相关技术的发展,数字电视的传播也正在朝着多样化的方向前进着,如何利用网络的强大资源进行数字电视信息的传输是当前研究领域的研究热点。本设计正是从此方向进行了深入的研究,设计的网络传输适配器能够充分利用已有的网络资源完成ASI的传输,结合Java技术,适配器能够实现全程的网络控制。网络传输适配器是基于嵌入式平台的网络产品,它结构简单、功能强大,充分利用了嵌入式的资源,在有限的硬件资源下达到了系统的最优化。在考虑到网络带宽的条件下,适配器也具有很高的吞吐量,完全满足用户的需求。论文主要进行了以下工作,首先,介绍了数字电视的相关发展以及相关的标准,网络技术的发展。然后介绍了适配器所用到的相关技术以包括嵌入式技术、B／S技术等,随后详细的描述了适配器中具体使用的一些技术和设计原理,包括多播技术、TCP/IP技术等。论文重点介绍了设计的详细思路和思想,以及在设计中的难题和解决方法。最后论文介绍了适配器的改进和系统的完善,包括升级系统,添加DHCP功能,采用RTP/RTCP等。系统设计中,对网络通信机制进行了详细的考虑,提出了几种目前比较实用的方案,在充分考虑了适配器的特殊需求之后,只选择了其中一种,网管和设备间的通信协议也进行了详细的设计,简单高效,网络流量低。目前,网络传输适配器已经设计完成,硬件模块和软件模块也设计完成,进行了功能模块测试和系统联调,整体性能优良。更多还原

【Abstract】 With the development of the network technology, the transmission of digital TV is becoming more diverse. The current hot research is how to transmit the digital TV programs using the powerful network sources. This design makes some deep research in this field. Combined with the Java technology, the adaptor can make full use of the network resources to send the ASI signal and can be monitored and controlled through the network thoroughly.Based on the embedded platform, the adaptor product can reach the system’s optimization under the special hardware condition, which also has the simple interface and more powerful function. With the limits of network bandwidth, adaptor may get the more throughout capacity and fulfill the user’s requirements.First, the paper introduces the development of digital TV and some main standards about the MPEG-2. Then it demonstrates the related technologies, such as embedded system, B/S technology and so on. The protocols that are mentioned and adapted in the adaptor are the multicast protocol and TCP/IP. The main part of the paper is the method and thinking of the design, which also includes the problems that encountered in the design and the method how to resolved them. At the last, the paper expounds the improvement and enhancement of the system, which includes the function of the DHCP and RTP/RTCP.In the design of the system, the paper has a deep think in the network communication mechanism and brings some practical method. After the consideration of the adaptor’s special requirement and condition, we choose the best one to supply the demand, which can reduce the network traffic and has high proficiency.At present, the adaptor’s design is basically completed. It shows that system performance is excellent after the module’s tests and verification of the whole system.更多还原