| 摘要 |
PURPOSE:To continue talking without retention of a radio transceiver even if the user disconnects from a telephone set main body by changing over the talking from the wire talking to the radio talking by means of the radio transceiver when the telephone set main body detects that a cord connecting the radio transceiver to the main body is disconnected. CONSTITUTION:When the user has to leave the telephone set main body 1 to study materials or the like and desires to continue talking during the talking, it can be performed by disconnecting the cord 3 from the handset 2. That is, in disconnecting the cord 3 from the handset 2, a relay A of the main body 1 and a relay B of the handset 2 are both restored, and contacts a, b of the respective relays are changed over to the position in solid lines in the figure. Thus, transmitter terminals T1, T2 and receiver terminals R1, R2 of a telephone set circuit 11 of the main body 1 are led respectively to a radio transceiver circuit 12 of the main body side via transformers TR1, TR2 respectively, while a transmitter T and a receiver R of the transceiver 2 are led to a radio transceiver circuit 22 of the handset side. |
