如果你想对跑步和步行的间隔计时的话，你可以用一个手表或者其他能够发出哔哔声信号的设备当你需要转换的时候。
If you want to time your running and walking intervals, you can use a watch or other device that beeps to signal when you need to switch.
无线电设备将一个营救人员电子声音信号转换成电磁波。
A radio converts the electronic signals of a rescuer's voice into magnetic waves.
一旦射频设备收集的信号从模拟到数字的格式转换之后，后端处理器将对传感器信号进行分析。
Back-end processors are used to analyze sensor signals, once they have been converted from analog to digital formats, that have been collected by the RF devices.
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