| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce noises radiated from an electric power supply wire in the case of superimposing communication signals on the electric power supply wire. <P>SOLUTION: In such a case of transmitting an image from, e.g., a camera 31 by using a PLC, signals produced by inverting the communication signals are superimposed on a ground wire 37 as well as superimposing the communication signals on the electric power supply wire 35. Then, in each of the electric power supply wire 35 and ground wire 37, the signals created by the superimpositions are allowed to run parallel to each other in the form of mutually inverted waveforms. Thus, mutual voltage variations of the electric power supply wire 35 and ground wire 37 can be canceled to be able to reduce the noises radiated from electric wire bundles. Consequently, noise interfusion to radio voices and distortion of TV pictures can be prevented and further malfunction of equipment such as electric components or the like can be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
