【作者】 王天晓；

【导师】 苏凯雄；

【作者基本信息】 福州大学 ， 通信与信息系统， 2005， 硕士

【摘要】 随着科学技术的飞速发展,广播电视的数字化浪潮以不可阻挡之势向前推进。基于MPEG-2 标准的图像压缩技术和DVB 标准的不断完善,极大地促进了数字视频广播技术的应用进程。随着有线电视网络的发展,广播电视正经历一个从模拟系统到数字系统的过渡,使得广播电视等专用传输网从系统规模到设备配置,从节目播出到信号传输都在新思维、新观念和新技术的基础上进行着前所未有的变革与创新,作为数字视频广播前端关键设备之一的码流接收发送设备成为当前研究与开发的热点。本论文在对USB 接口技术及相关理论进行详尽分析的基础上,根据DVB 和MPEG-2 标准,结合最新的USB2.0 接口技术,给出了DVB 码流接收发送系统的实现方案。本论文首先对系统中用到的主要关键技术和相关标准进行大概性的介绍,包括USB 接口规范、WDM 驱动开发模型、CPLD 应用开发技术以及DVB 码流分析方法。然后把系统分成硬件和软件两个模块,分别进行分析和阐述,主要侧重于数据流如何从底层硬件接口一步步传送到PC 机硬盘文件上,并可以进行双向的数据传输。因此,在硬件设计模块,我们采用了最适合连续高速数据传输要求的Slave FIFO 模式,并采用FIFO 对数据流进行缓冲;在软件设计模块,我们也侧重于各层软件之间的数据流接口是如何向上提供服务,向下发出服务请求的。最后我们对系统的硬件和软件模块进行测试和分析,并在测试小结中对本次课题的研究遇到的问题和困难进行总结,为以后的相关系统开发增加经验。在结束语部分指出了系统的不足和尚待改进的地方。本项研究的重点在于深入理解USB 总线规范的基础上,以USB 接口芯片为核心进行硬件设计,电路设计的难点在于完成对各逻辑模块间的时序和逻辑控制。本论文还就接收下来的码流如何进行分析做了详尽的阐述,为组成一个完整的码流传输和分析系统打下基础。本论文课题的完成,在理论与技术上,为高速DVB 码流的接收和发送提供一种新的思路和实现手段;在实践上,根据DVB 工程师的移动办公需求,提供了一种高性价比的DVB 码流接收发送和分析解决方案。更多还原

【Abstract】 With the fast development of science and technology, the digital course of broadcasting television is advancing more and more rapidly. Furthermore, with the adoption of MPEG-2 as image compression standard, and the establishment of DVB as a recommended international standard, the application course of digital video broadcasting is accelerated dramatically. Meanwhile, the television broadcasting is in the interim of analog to digital system along with the development of CATV network, which makes the special transmission nets carry out an enormous transform and innovation, including new thoughts, new ideas and new technology on program playing , signal transmission, and so on. As one of the most important equipments in the front-end, stream’s transmit-receive equipment has already being the hotspot in the research and development domain. According to the elaborate presentation of USB Interface Technology, correlative theory, DVB and MPEG-2 standard, and the latest USB2.0 interface Technology, this paper confirms a realization scheme of DVB stream’s transmit-receive system. Firstly, the paper makes a general introduction of the main technology and correlative standards which are used in the system, including USB Interface criterions, WDM Driver Development Model, CPLD Application Development Technology and DVB stream analysis methods. Then the paper divides the system to hardware and software parts, it analyses and presents them separately, lays a strong emphasis on explaining how the data streams can be stored in PC harddisk by being transmited from bottom hardware and how to realize the bi-directional data transmission. Therefore, in the hardware design module, the paper adopts Slave FIFO mode which is the most suitable for continuous and high-speed data transfer and uses FIFO to buffer the data streams; in the software design module, the paper also mainly illuminates how the date streams Interface provides services for upper layers, sends services requirement to lower layers. Finally, the paper shows the testing procedure and gives out the testing results, summarizes problems and difficulties which came across in the research., in order to increase experiences for later correlative research. The paper points out the disadvantages as well as the improvement of the system in the tag part. The emphases of this research are on using the USB Interface Chip as kernel for hardware design, based on the deep comprehension of USB Bus Criterions, and the difficulty of the circuit design is how to finish each logical modules’data sheet and logical control. Also the paper makes a full presentation for how to analyse the received data stream, it provides the foundation for consisting of a integrate stream transmission and analysis system. Theoretically and technically, the implementation of the scheme proposes in this paper will ultimately offer a new realizing means for the receiving and transmitting of DVB transport stream. In practice, it will supply a DVB stream transmit-receive system solution which has high price performance ratio.更多还原