| 摘要 |
<p>PURPOSE: A warn device for a civil defense is provided to improve the convenience of citizen by turning on/off a lamp according to the kind of alma signal. CONSTITUTION: A civil defense alarm comprises a receiver, a control device, an output device, and a lamp. The receiver receives an AM(Amplitude Modulation) or a FM(Frequency Modulation) signal from a broadcast station. A control device decides whether the signal received from receiver is corresponded to a air-raid warning or a preliminary warning or not. The output device outputs the on/off signal to the lamp according to a decision result of a central control unit. The lamp is turned on/off according to an turn on/off signal.</p> |
