| 摘要 |
PURPOSE:To increase the safety for the crew on mobile body, by avoiding unnecessary delivery of continuous call tone, through the discrimination of the crew on board, and if on board, through the response hold condition automatically with the mobile telephone after a given time. CONSTITUTION:When the mobile tepephone is called via radio signal from the fixed unit, call out signal is received with the signal reception unit SR1, and the call out tone delivery unit TR2 is started with the output and call out tone is delivered. Simultaneously, timing is started with the response hold control unit AR3, and if on response by the crew is made within a given time and the crew is determined as no board with the crew discrimination unit DT4, the telephone set transfers to the response hold condition, the condition dispaly is made and the call out tone of the unit TR2 is stopped. Further, the response hold condition is released with the response operation and commuication condition is made. Thus, unnecessary continuous call out tone is avoided from being delivered and the increase in the safety for the mobile crew can be made. |
