摘要
详细分析了MPEG-2和DVB支持条件接收的机制,着重讨论了条件接收系统的安全技术和兼容技术,对加扰控制位的含义、控制字的变化、以及加扰的两个层次提出了建议。
The mechanism s of MPEG-2and DVB supporting conditional access are analyzed carefully at the beginning,and then the techniques of security and compatibility of conditional access system are fully dis-cussed.Some private advice on the means of scrambled control bits,and the changing of control word,and the two levels of scramble is given at the end.
出处
《电视技术》
北大核心
2002年第3期4-6,16,共4页
Video Engineering
