| 摘要 |
PURPOSE:To improve communication efficiency by reporting the speaking time limitation information of radio communication to the user of a cable line as well. CONSTITUTION:A signal for transmitting an alarm 30a provided on the reception side is added through an analog switch 34 to a signal tone on the transmission side. A control means 29 performs control through an alarm transmission control signal 35 so as to turn on the analog switch 34 when generating the alarm 30a. Corresponding to this operation, the control means 29 automatically performs switching from a receiving state to a transmitting state through a transmission/reception control signal 29c so as to transmit the alarm 30a as a transmissive sound even when a radio equipment 27 is set in the receiving state. Therefore, since the user of the cable line can recognize the limited time of speaking and can put speaking contents in order, communication efficiency can be improved. |
