双向有条件接收技术  

Two-way conditional access technology

作　　者：陈天生[1] 许碧娟[1] 

机构地区：[1]福州大学物理与信息工程学院,福建福州350108

出　　处：《现代电子技术》2013年第1期70-73,共4页Modern Electronics Technique

摘　　要：随着信息技术和数字电视的不断发展,双向互动业务越来越受人们的重视,新的增值服务给条件接收带来新的要求。主要研究双向条件接收技术,采用当前数字有线网络中使用的数字有线机顶盒单向CA系统对比双向CA系统的实现方法,讨论实际中使用的机顶盒中该技术的软件框架。相对于传统的封闭式CA系统,双向CA具有无卡方式、有卡方式的特点,双向CA的安全性不再依赖CA厂商,广电运营商真正掌握了主动权,打破了条件接收系统的封闭。With the continuous development of information technology and digital television, more and more concerns are directed into two-way interactive service. The new value-added services bring the new requirements to conditional access. This paper mainly studies the two-way conditional access technology which is realized through the comparision of the one-way CA sys- tem of digital cable set-top boxes in the current digital cable network with the two-way CA system, and discusses the software framework of the technology in the actual application of the set-top box. Compared with the traditional closed CA system, the two-way CA consists of CA with card and CA without card. The security of the two-way CA is no longer dependent on CA vendors, and the operators really take the initiatives to break the closure of the conditional access system.

关 键 词：条件接收 加扰 控制字 双向CA系统 

分 类 号：TN941-34[电子电信—信号与信息处理]