本文探讨了数字相关通道失效实时自动切换的几种实现方法，着重失效信号的检测和切换指令的产生。
In this article several methods for implementation of the real-time automatic changeover of the digital related channels in failure are discussed.
在规定的时间内，没有召唤或指令信号，轿内的风扇和照明会自动关闭，以节省能源。
If there is no call registered within a predetermined period of time, the car fan and car light are automatically shut off to conserve energy.
该系统利用激光采集行车信号，辅以光电技术处理，自动发出交通指令。
The traffic-actuated information is collected by laser. After photoelectric technology, the system emits traffic-control signal automatically.
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