基于DVB-C的数字电视条件接收系统的设计与实现

针对我国数字电视广播的机卡分离产业政策，提出了一种基于智能卡条件接收接口（SCAI）的数字电视接收机（包括机顶盒和一体机）机卡分离技术。该技术不需要改变现有数字电视接收机的硬件配置，只需要在接收机中嵌入一个符合SCAI规范的条件接收软件插件就可以配合相应的条件接收智能卡实现条件接收功能，从而使得接收机成为与发射端特定条件接收系统无关的通用接收平台。该技术与国内外提出的基于PCMCIA卡或USB2．0卡的机卡分离方案相比，成本更低，实现更简洁。该技术方案也是我国数字电视广播的候选行业标准之一。

Design and realization for Digital Television Receiver Conditional Access System Based on DVB-C

According to the national conditional access sub system separation(CASS)industrial policy for digital television(TV)broadcasting,this paper proposes a smartcard conditional access interface based CASS technique scheme for the digital TV receiver(including the set-top-box and the integrated receiver).The proposed scheme has no additional requirement of any hardware configuration modification for the most current commercially available digital TV receivers in order to make them be common receiving platform independent of any specific CAS used by the broadcasting head-end.The only prerequisite is an inclusion of common conditional access software plug-in(CCAP)compliant with the SCAI specification in the digital TV receiver and the corresponding conditional access smartcard.Compared to the schemes using PCMCIA-card or USB2.0-card,the proposed one is cost-effective and more succinct.This scheme is also one of the candidate national standards for Chinese digital TV broadcasting industry.