双解调高清机顶盒的设计与实现

发布时间：2018-04-10 06:06

本文选题：卫星影院　切入点：中星6A　出处：《电子科技大学》2017年硕士论文

【摘要】：随着高清大屏越来越多的走进千家万户,配套的高清节目的接入方式也是百家争鸣。消费者为了收看更多的高清多媒体内容,既能用已经在网上下载好的内容进行本地播放;也可以通过有线高清机顶盒来实时收看;或者用高清网络播放器进行自助点播;甚至部分音视频发烧用户选择价格较高的蓝光播放器来播放画质更好的蓝光碟片。但是对于部分不愿再家里堆积大量蓝光碟片、所在地互联网不够发达且当地有线电视高清内容较为匮乏的消费者,有没有一种新的高清多媒体内容接入方式呢?基于DVB-S2标准的高清卫星电视正好填补了这一空缺。某传媒有限公司依托国内先进的通信卫星服务技术及优质的资源,提出了“卫星影院”解决方案。即租用中国上空的中星6A卫星转发器,将经过发行商授权的数字出版物,如音像、电子报刊杂志、游戏、软件、实用信息等丰富的多媒体内容,以PUSH-VOD(Push Video On Demand推送式视频点播)方式推送到用户的终端机顶盒,并且保存在机顶盒自带的硬盘。终端机顶盒收到这些内容后,经过认证解密即可在电脑、电视等设备观看这些精彩内容(如好莱坞新片、经典影片、经典美剧、英剧、纪录片等)。本文基于该传媒公司对终端机顶盒的要求规范,研究并设计了一款既能收看卫星推送的“卫星影院”节目、又能收看地方有线电视节目的机顶盒。前者工作于DVB-S2模式,后者工作于DVB-C模式,均支持收看高清节目,故命名为双解调高清机顶盒。文章分别介绍了两种模式下前端系统及终端系统组成,分析了该传媒公司终端规范要求后画出了机顶盒原理框图。随后根据框图进行了主要芯片选型、外围电路设计、接口扩展等硬件电路设计;并介绍了机顶盒软件框架,描述了调谐器、解调器软件驱动移植过程,分享了驱动移植过程的中解决问题的思路;讨论了机顶盒PUSH过程中数据保存的流程、机顶盒几种工作状态之前的切换,以及如何利用程序签名认证保证PUSH内容的信息传输安全;完成设计最后经过一系列测试最终达到了预计的设计要求。
[Abstract]:With the high-definition screen more and more into thousands of households, the matching access mode of HD programs is also a hundred schools of thought contention.In order to watch more high-definition multimedia content, consumers can not only use the content that has been downloaded on the Internet for local play, but also can watch it in real time through the cable high-definition set-top box, or use the high-definition network player to self-order;Even some audio and video fever users choose a higher-priced Blu-ray player to play better Blu-ray discs.But for some consumers who do not want to pile up a large number of Blu-ray discs at home, the location of the Internet is not developed and the local cable TV HD content is relatively scarce, is there a new high-definition multimedia content access?The DVB-S2 standard-based high-definition satellite television just fills the gap.Relying on the advanced communication satellite service technology and high quality resources, a media company put forward the solution of Satellite Cinema.That is to say, the satellite transponder of China Star 6A over China will have rich multimedia content such as audio and video, electronic newspapers and magazines, games, software, practical information, and other digital publications authorized by the distributor.It is pushed to the user's terminal set-top box with PUSH-VOD(Push Video on Demand push video on demand (VOD) mode, and stored in the STB's own hard disk.After receiving this content, the terminal set-top box can be authenticated and decrypted to watch the wonderful content on computer, television and other devices (such as Hollywood new films, classic movies, classic American TV, British drama, documentary and so on).Based on the specification of the terminal set-top box, this paper studies and designs a set top box which can not only watch the satellite cinema program, but also watch the local cable TV program.The former works in DVB-S2 mode, while the latter works in DVB-C mode, which supports watching HD programs, so it is named double Demodulation HD STB.This paper introduces the front-end system and the terminal system in two modes, analyzes the requirements of the terminal specification of the media company, and draws out the schematic block diagram of the set-top box.Then according to the block diagram, the main chip selection, peripheral circuit design, interface expansion and other hardware circuits are designed, and the software framework of set-top box is introduced, and the process of the tuner and demodulator software drive and transplantation is described.This paper shares the idea of how to solve the problem in the process of driving transplantation, discusses the flow of data saving in STB PUSH process, the switching before several working states of STB, and how to use program signature authentication to ensure the information transmission security of PUSH content.After a series of tests, the design finally reached the expected design requirements.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN948.55

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