Scrambling and descrambling of CATV;
有线电视加扰与解扰技术
The composition frame of CA system in cable digital technology DVB-C,operation principle of the system,the secure key system,the scrambling technology and encryption are introduced,including the concept of SimulCrypt.
系统地介绍了有线数字电视技术DVB-C中条件接收CA系统的组成框架、系统工作原理、安全密钥体系以及加扰技术、加密技术、及同密的概念等;重点结合数字电视条件接收系统工作实践,对条件接收技术在数字电视方面的应用作了分析和研究。
After analying the analogic and digital scrambling ways,line rotation scrambling,line jitter scrambling,line permutation ways of digital scrambling processing are discussed in detail.
在分析了电视加扰技术中的模拟加扰方式和数字加扰方式后，对数字加扰时基处理中的行旋转、行置换、行变换等方法做了详细分析；为了保护有线电视加扰系统的安全，采用了随机数的产生、数据的加密等技术。
This paper proposes a new method to decrease the onset-temperature of thermoacoustic systems by introducing a pressure disturbance and verifies its feasibility by experi.
该文首次提出利用外加扰动降低系统起振温度的设想,并在自行研制的多功能行波热声发动机实验台上进行了实验验证。
A new transparent scrambling algorithm was proposed which performs an arbitrarily degraded view of the decoded picture by encrypting DCT coefficients of the Intra frames.
提出一种新的在DCT域实现的透明加扰算法,按照特定规律修改Intra帧的DCT系数,再利用帧间预测将加扰效果扩散至所有帧,最终实现视频的无级扰乱。
A three level scrambling scheme realized with scrambling key K s, working key K w and allocating key K m for a conference TV scrambling system is presented.
提出了电视会议加扰系统中用加扰密钥Ｋｓ，工作密钥Ｋｗ，分配密钥Ｋｍ实现的三级加密体制，给出了寻址与密钥管理构造原理图，着重分析了数据加密算法ＦＥＡＬ－８的特点以及系统的抗攻击性能，得出系统安全可靠的结
The paper provides a joint approach of digital fingerprint and video scrambling algorithm.
在部分加密的基础上,说明了数字指纹嵌入和视频加扰编码算法结合的应用算法。