| 摘要 |
PURPOSE:To secure a condition where an interrupting processing can be executed, even when the receiving condition of a receiving broadcasting wave is deteriorated by providing a controller to control a receiving frequency data value, a lock detecting circuit to generate a lock step-out detecting signal, etc. CONSTITUTION:Based on a turning command from an operating part 16, a controller executes a turning action by controlling the receiving frequency data value of a PLL circuit 2a in a front end 2. When the lock step-out detecting signal is supplied from a lock detecting circuit 11, the controller 14 decides the fact that the receiving condition of a broadcasting station in the middle of receiving is deteriorated and the demodulation of the data is made impossible. When the demodulation of the data is made impossible in the standby condition of a traffic announcement identification interruption, a mode is made into a sweeping mode, and a frequency is switched to the receiving frequency of an RDS(radio data system) broadcasting wave to broadcast traffic information in which the receiving condition is satisfactory. Since, even when the receiving condition of the receiving broadcasting wave is deteriorated, interrupting data such as the traffic information can be obtained, the interrupting processing can be surely executed. |
