条件接收系统(CAS)是DVB系统实现增值的核心，能够提供有效的系统管理和用户控制。
Conditional access system (CAS) is the key to realize the increment of the DVB system and provides effective system management and subscriber control.
文章对机顶盒的软件结构进行了概述并重点介绍了前端控制软件、节目管理软件和有条件接收接口软件。
The STB software structure is described with focus on the software of front-end control, program management and CA interface.
在该场景下，重复消息的接收者是一个多对象(muliobject)，警戒表明了控制该重复的控制条件。
In such a scenario, the receiver of the repeated message is a multiobject and the guard indicates the condition that controls the repetition.
针对数字电视有条件接收系统中的密钥分配，提出了一种基于椭圆曲线密码的分层访问控制密钥分配方案。
A key distribution scheme based on elliptic curve cryptography for Conditional Access System (cas) in Digital TV broadcast is proposed.
条件接收技术是数字电视接收控制的重要保障，它是实现付费电视与互动业务平台关键。
The technology of Conditional Access is the important guarantee for Digital television Receive and control. Conditional Access is the key to realize the pay TV and interactive TV platform.
该系统每个车上有一个工业语音提示器，它接收中央控制室发来的信息后，根据接收到的信息提示操作人员进行操作，为操作人员的正确和安全操作提供了有利的条件。
It can receive the information from the central control room, which is then used to reminder the operators how to do, and to provider them the favorable conditions to operate correctly and safely.
该系统每个车上有一个工业语音提示器，它接收中央控制室发来的信息后，根据接收到的信息提示操作人员进行操作，为操作人员的正确和安全操作提供了有利的条件。
It can receive the information from the central control room, which is then used to reminder the operators how to do, and to provider them the favorable conditions to operate correctly and safely.
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