摘要
数字电视指将传统的模拟信号转化为数字进行处理、传输和接收的系统。数字电视的条件接收系统运用各种数字技术通过对节目的加扰处理,使只有授权用户才能收看被加扰节目,从而保障运营商的利益,保证数字电视发展。本文主要阐述当前数字电视使用的条件接收系统的基本原理,以及实际中应用两种条件接收方式的设计和实现,并比较两种方式的优势和不足。最后介绍当前国内数字电视发展的现状。
Digital television is a kind of system in which analog signals are transformed into digital signals. The digital signals are processed and transferred by using some digital technology in the system.Conditional access system for digital television scramble some services to ensure that only entitled subscribers can get those services.In the way service providers make a profit, at the same time it guarantee development of digital television.This paper analyzes the principle of conditional access system that used in digital television.Then it introduces two methods usually used to implement conditional access and discussed the strong points and shortcomings of both methods.Lastly the development of Conditional Access System in China is given.
出处
《现代电子技术》
2005年第9期19-21,共3页
Modern Electronics Technique
