此程序是无线发射与接收，也是汽车电子上的到速雷达，利用四路传声波传感器接受信号经高频无线发射，放在驾驶室里的接受装置，能够反映车后面的情况。并能够在液晶屏清晰显示在身的地点。-this procedure is wireless transmitter and receiver, as well as automotive electronics to speed on the radar, Four-use acoustic sensors for high frequency radio s

简要介绍了Airplay、DLNA和Miracast等3种无线传输技术；详细说明了Android 4.2上Miracast的实现流程。(3 kinds of wireless transmission technologies, such as Airplay, DLNA and Miracast, are briefly introduced. The realization process of Miracast on Android 4.2 is explained in detail.)