Patent ID: 8718571
Filing Date: 2014-05-06
Classification: H04L

Abstract:
1. A transmitting and receiving device, comprising: a transmission circuit that transmits transmission data by FM-modulating a carrier wave of the transmission data, the transmission circuit including: an FM demodulation circuit that generates a demodulation signal by FM-demodulating a received signal; a first filter circuit that changes a pass-band for letting the received signal pass through according to the demodulation signal; and a parallel resonance circuit that adjusts a resonance frequency to a first carrier frequency of the communication signal according to the modulation pattern data, and adjusts the resonance frequency to a second carrier frequency of the received signal according to the frequency demodulation data, wherein the transmitting and receiving device performs a power supply line communication through the power supply line in which a signal is transmitted and received among the plurality of transmitting and receiving devices.