| 摘要 |
PURPOSE:To attain inter-slave set talking by having only to provide a master set transmission reception section to the master set. CONSTITUTION:A master set 2 is provided with plural slave sets 9, 15 and one master set transmission reception section 28 making radio wave transmission reception, and each slave set is provided with a slave set transmission reception section 11 or 17 making transmission reception of a radio wave to the master set. The master set transmission reception section 28 is provided with a token switching request signal transmission means 28a that provides a transmission right to one slave set in the inter-slave set talking via the master set 2 to send a voice signal and a control signal by a radio wave of a 2nd frequency to the master set 2 and allows the other slave set to receive a radio wave of a 1st frequency from the master set 2 and sends a transmission right switching request signal used to transfer the transmission right of the radio wave of the 2nd frequency from the slave set having the transmission right to the slave set without the transmission right to the slave set having the transmission right after lapse of a prescribed time and sends the token switching request signal to th other slave set having the transmission right after lapse of a prescribed time further and then the transmission right switching request signal to the slave set having the transmission right repetitively after lapse of a prescribed time. |
