数字电视CA系统发送端通信接口实现

摘要

通过分析条件接收(Conditional Access System,CAS)基本原理以及关键技术,研究数字电视标准中授权控制信息发生器(ECMG)、授权管理信息发生器(EMMG)、同密同步器(SCS)和复用器(MUX)之间的通信协议等,提出一种ECMG、EMMG、SCS与MUX通信的软件解决方案,用于产生授权管理信息(ECM)和授权控制信息(EMM),实现服务器与加扰机之间多线程通信.%analyzing the basic principles of digital TV Conditional Access System (CAS) , the paper discusses the communication protocol of Entitlement Control Message Generator(ECMG) , Entitlement Management Message Generator (EMMG) , Simul-crypt Synchronizer (SCS) and multiplexed MUX). Proposes a software solutions to achieve the generation of Entitlement Control Message(ECM), Entitlement Management Message (EMM) and multi-threaded communication between ECMG and scrambler.