| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for modulating/demodulating a phase of a distribution line carrier signal with a simple circuit configuration that can execute accurate demodulation. SOLUTION: A transmitter 1 generates a phase reference signal from a commercial frequency signals, a receiver extracts a phase reference signal from a synchronizing signal of a carrier signal and demodulates the carrier signal on the basis of the extracted phase reference signal to output information sent from the transmitter 1 by using the carrier signal on the basis of the phase reference signal. Thus, even when a phase difference takes place between the commercial frequency signal and the phase reference signal generated by the transmitter due to a signal transmission line such as a distribution line 400 or a load or the like, since no phase difference exists between the phase reference signal of the transmitter 1 and the phase reference signal of the receiver 2, the receiver can quickly and accurately demodulate the information just after the reception and the circuit configuration of the receiver 2 can be simplified. |
