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.