| 摘要 |
PURPOSE:To make it possible to prevent deterioration of S/N and to control talking exactly, by not sending out two kinds of tone signals at the same time from the base station. CONSTITUTION:When the base station turns ON a group selective signal SELA, the gate circuit GA is opened, and a tone signal FA is added to the transmitting part T together with a transmitting voice signal TVS and is sent out. Therefore, only a moving unit of the group A is able to receive this voice signal and to listen to it. When transmission is performed from the moving unit of the group A, which has come to be able to talk by receiving the tone signal FA, a receiving voice signal RVS is output from the receiving part R, simultaneously a signal in course of receiving rcv is output, by which the gate circuit GA is closed and the gate circuit GL is opened, a lock tone signal FL is sent out instead of the tone signal FA, and transmission of the moving unit other than that which is in course of transmission is inhibited. |
