| 摘要 |
PURPOSE:To decrease number of connection cables by transmitting/receiving voice while being superimposed on a power transmission line from a main body to each remote controller. CONSTITUTION:An AC power supply of 100VAC is inputted to the main body 1, converted into a DC voltage by a transformer 5, a full wave rectifier 6 and a low pass filter 8 and sent to remote controllers 2, 3 via connection lines 9, 10, 11, 12. On the other hand, a voice signal from an equipment such as a radio set or an interphone formed by a voice equipment 18 of the remote controller 2 is amplified by an amplifier 19 and fed to a winding 15 of a coupling transformer. The signal is produced between the connection lines 11, 12 from between the connection lines 9, 10 through a capacitor 16 and sent to the remote controller 3. |
