| 摘要 |
PURPOSE:To simplify the configuration of a circuit and to apply a titled device to a home electric appliance by using in common a carrier signal for superposing an information signal, and a clock signal to a transmitting and receiving digital logical circuit for managing the transmission and reception of a signal. CONSTITUTION:In a power source supply side transmitting and receiving device 1, a signal superposing and separating circuit 10 executes a superposition and a separation of a power source VB and an information signal. It is executed by setting a capacity of a capacitor 8, and an equivalent inductance seen from the secondary winding side of a transformer 6 to a suitable value. A base band signal (DATA) of an information signal outputted from a transmitting and receiving digital logical circuit 14, and a carrier signal (CARRIER) outputted from an oscillating circuit 13 are inputted to a modulating circuit 11, and the signals are modulated to drive the transformer 6 of the signal supperposing and separating circuit 10 and to superpose the information signal on a transmission line. On the contrary, the information signal transmitted from other transmitting and receiving device through transmission lines 5a, 5b is separated and detected from a power source component by the signal superposing and separating circuit 10 to be inputted to a demodulating circuit 12. A rectangular pulse outputted from the oscillating circuit 13 is provided as a carrier signal to the modulating circuit 11, and also inputted as the clock signal of the transmitting and receiving digital logical circuit 14. |
