【作者】 沈薛宁；

【导师】 李华；

【作者基本信息】 天津大学 ， 信号与信息处理， 2005， 硕士

【摘要】 数字电视是指将模拟电视信号转换成数字信号进行传输、接收、处理、存储和控制的系统。机顶盒用于将数字电视信号转换成模拟电视可以接收的信号,使现有的模拟电视用户也可以享受到数字电视带来的好处。因而,数字电视机顶盒的开发对于推动我国数字电视产业的发展具有非常重要的现实意义。本论文的内容分为两大部分:论文第一部分主要内容是介绍Broadcom公司BCM7115+BCM7021+BCM7040三片系统方案的数字高清晰度电视机顶盒的硬件系统。BCM7115是Broadcom公司集信道解码、系统控制和标准清晰度信源解码于一体的数字电视机顶盒专用芯片。BCM7040完成数字电视节目的MPEG-2编码功能。BCM7021完成高清晰度信源解码的功能。本部分也详细介绍了系统的设计、实现和调试的方法。论文第二部分主要是介绍Broadcom公司机顶盒方案系统软件方面的内容。本机顶盒系统采用了当前较为流行的嵌入式Linux操作系统,所有的软件开发都要基于嵌入式Linux操作系统。机顶盒的硬件设备都需要驱动程序,而在Linux下设备驱动程序的开发是机顶盒系统软件开发的重点。论文中结合作者实际开发的两个驱动程序详细介绍了Linux下字符型设备驱动程序的设计过程。更多还原

【Abstract】 Digital Television is the system used to transport, receive, process, record, andcontrol digital TV signals. Set-top boxes receive and transform digital TV signals intothe signals that analog TV sets can display, which can make the users of analog TVsets enjoy the merit of digital TV. So, set-top box is an important product drivingdigital TV industry during current analog TV and digital TV coexistence period.The content of this dissertation is divided into two parts:The first part is to introduce a HDTV STB solution of Broadcom, which is madeup of BCM7115, BCM7040 and BCM7021. The BCM7115 chip is the Broadcom’sASIC chip for STB and it has the functions of system control, audio decoding,MP@ML MPEG video decoding and channel decoding. The BCM7040 can encodethe analog video into the MPEG-2 bit stream. The BCM7021 can decode theMP@HL MPEG video source. The thesis discusses in detail on the system design,realization and debugging of the system.The second part is to introduce the system software of HDTV STB solution ofBroadcom. This STB system uses Linux as its operation system, which is thepresently popular solution of embedded systems. All the research and development ofthe system software must be based on the embedded Linux operation system. Everydevice in the STB has its device driver and it is important to develop device driver onthe embedded Linux operation system. This part discusses in detail on the wholedesign process of character device driver with two actual examples developed by thewriter.更多还原