| 摘要 |
PURPOSE:To attain immediate voice reply without use of a hand and to facilitate a reply to a base station by installing in advance a microphone to a location where a voice of a driver sufficiently reaches in the system that individual call is applied to the driver driving an automobile. CONSTITUTION:A transmission radio wave from a base station is received by an antenna 1 and inputted to a reception circuit 3 through an antenna changeover circuit 2. A demodulated reception signal is discriminated by a code discrimination circuit 4 and when an individual call signal is coincident with its own code, a voice circuit 5 is activated and a voice signal is outputted through a speaker 6. When an end of call signal is sent, the circuit 4 interrupts the circuit 5 and sends a signal to a transmission control circuit 7 to activate a transmission circuit 9. The transmission time is managed by a timer 8 and interrupts the circuit 9 at a preset time and when a mobile station calls a base station, a press-to-talk switch 10 is operated the same as a conventional system. When a driver leaving, the driver operates an absence switch and informs the absence to the base station. |
