| 摘要 |
PROBLEM TO BE SOLVED: To provide an intercom system that can add a slave unit as a slave unit for reception and can transmit voice regardless of the maximum number of slave units connected to a master unit.SOLUTION: A slave unit 3am is connected with a master unit 2a as a master command reception slave unit for communicating bi-directionally, and slave units 3as1, 3as2 are connected with the master unit 2a as slave command reception slave units for communicating bi-directionally. When a voice transmission button is depressed, the slave command reception slave units 3as1, 3as2 release connection for unidirectional communication with the master unit 2a, connect as regular slave units for communicating bi-directionally, and move to a state in which voice transmission is permitted. The slave command reception slave units 3as1, 3as2 release connection for bi-directional communication and restore connection for unidirectional communication when a prescribed time counted by a timer has passed after end of the voice transmission. |
