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1·Output force phase should be controlled so as to get the far field signal inphase with the output force phase.

为了保证远场信号的相位与激振力的相位一致，应当控制激振力的相位。

2·The design of the communication and controlling circuit that transmits DTMF code in AC220 inphase power line is presented. It forms a complete system with data picking and processing circuit.

介绍一种利用220伏同相电力线载波传送dtmf编码数据的系统中的通讯及控制电路的设计，它与数据采集电路及数据处理电路构成一个完整的系统。