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发明授权
CN100588242C 数字电视信号的加密及调制方法 有权

数字电视信号的加密及调制方法
摘要：
本发明提供一种数字电视信号的加密及调制方法，包括帧同步检测模块和动态加密模块读取原始数字电视信号；帧同步检测模块检测原始数字电视信号的同步头和结束码，在该同步头和结束码与其存储的同步头和结束码相同时，发送同步触发信号至动态加密模块；动态加密模块接到同步触发信号后，用加密数据替换所述原始数字电视信号中的同步头和/或结束码产生帧加密的数字电视信号；控制模块将密钥和所述原始数字电视信号中被替换的同步头和/或结束码编码生成数据信号；调制模块分别对帧加密的数字电视信号和数据信号进行调制，并将调制后的帧加密的数字电视信号和数据信号合并成加密数字电视信号。本发明实施简单，成本低，技术开发难度低，可靠性高。
摘要（英）：

The invention provides an approach of encrypting and modulating digital TV signal, the details are: frame synchronized detecting module and dynamic encrypting module read original digital TV signal; frame synchronized detecting module detects synchronization head and ending code of original digital TV signal, while the detected synchronization head and end code are same with that in memory send asynchronization spring signal to the dynamic encrypting mode; after the encrypting module receiving the spring signal it replaces the original synchronization head and end code by encrypted data to generate frame encrypted digital TV signal; controlling module encodes key and relative replaced synchronization head and end code to produce data signal; modulating module modulates frame encrypted digital TV signal and data signal respectively and combines the done data. The invention is simple, easy, low-cost and reliable.

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