| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a noise cancellation device that removes a wide band of noise signals in a simple configuration. <P>SOLUTION: A hybrid divider 6 divides a noise signal N detected by a noise pickup 5 into divided noise signals N1-N4 having different phases ϕ1-ϕ4. Noise removal circuits 7 adjust amplitudes and phases ϕ1-ϕ4 of the divided noise signals N1-N4 to the same amplitude as the noise signal N and the opposite phase to the noise signal N in respective divided bands F1-F4 before adding them to a received signal Sr. The noise removal circuits 7 thus output noise-removed signals S1-S4 with the noise signal N removed in the divided bands F1-F4. A duplexer 11 then captures and combines the noise-removed signals S1-S4 in the divided bands F1-F4 to output a PLC signal S0 which removed the noise signal. <P>COPYRIGHT: (C)2013,JPO&INPIT |
