| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption of a slave unit to save power in standby without a call from the slave unit to a master unit, in the call from the slave unit to the master unit, and in reception of call check sound in which the call check sound is emitted from the slave unit.SOLUTION: In the standby without the call from the slave unit 1 to the master unit 2, in the call from the slave unit 1 to the master unit 2, and in reception of the call check sound, in which the call check sound is emitted from a slave unit speaker 105 of the slave unit 1, the intercom device stops an operation of a slave unit power supply circuit 108, holds input impedance of the slave unit power circuit 108 as the high impedance, transmits the call check sound to be transmitted from the master unit 2 to the slave unit 1 by a baseband and drives the slave unit speaker 105. |
