| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication apparatus, a relay apparatus, a communication method and a communication system which are capable of causing an electronic apparatus to perform processing based on a processing command transmitted via a power line.SOLUTION: A communication apparatus includes: a connector that connects a power line, along which power is transmitted at a given frequency, to an external apparatus; a transmitter that transmits, via the power line, a carrier signal obtained by modulating a transmit signal that has been obtained by encoding a processing command for executing a given process, at a carrier frequency higher than the frequency of the power; and a communication filter which is connected between the power line and the transmitter and at least blocks signals at the frequency of the power while not blocking signals at the carrier frequency. |
