一种条件接收系统的实现

Implementation of a kind of conditional access system

本文应用相应的条件接收标准,提出了一种在现有设备基础上实现数字电视条件接收系统的方案。通过对发射端和机顶盒的改造,利用简单的硬件连接以及软件设计,成功地实现了对现有系统的改造。在发射端,在数字电视应用较广的复用器后,接了一个智能加扰器,实现对数字电视信号的加扰;在接收端,对现有的机顶盒解码与解调芯片实施巧妙的中间件连接,实现了对加扰数字信号的解扰。

Applying the corresponding conditional access criterion, the paper put forward a kind of scheme for conditional access system, which was under the equipments we had. Through altering the transmitter and the STB （set top box）, using ordinary hardware connection and software design, the reconstruction of existing system was successfully actualized. An intellective disturbed equipment connected to the comprehensive used MUX, which implemented the task of disturbing digital television signal in the sending end. The middle equipment between decoding chip and demodulating chip implemented the contrary action can be easily actualized, and adequately used the hardware to the digital television signal in receiving end. This scheme resources.