| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of cables supplying power and suppress noise between a master unit and a slave unit.SOLUTION: A slave unit 20 comprises: an effect board 24; a PLC modem 23 for performing communication with a master unit 10; a filter 21 for maintaining impedance matching to a cable 30, suppressing noise from the effect board 24, and outputting a voltage supplied from the master unit 10; and a DC-DC power source 22 for stepping down the voltage which is output from the filter 21, to a first voltage appropriate for operation of the effect board 24. The master unit 10 comprises: a control PC 13; a PLC modem 14 for performing communication with the slave unit 20; an AC-DC power source 11 for outputting a second voltage which is higher than the first voltage; and a filter 12 for maintaining impedance matching to the cable 30, suppressing noise from the AC-DC power source 11, and outputting a direct current voltage which is output from the AC-DC power source 11 to the slave unit 20 through the cable 30. |
