| 摘要 |
PURPOSE:To obtain a system receiving surely traffic information containing in plural radio broadcasts by changing over a frequency dividing ratio of a PLL. CONSTITUTION:A radio signal received by an antenna 4 is given to a tuner 6 listening to a desired radio broadcast and a tuner 7 listening mainly to traffic information via a branching circuit 5. A signal demodulated by each tuner is outputted as sound from a speaker 13 via a changeover switch 8. A PLL6f receives a signal deciding a frequency dividing ratio from a line 15 and an oscillated frequency from a local oscillator 6b is frequency-divided by a frequency-division circuit 6g. A receivable tuning frequency is changed and plural radio broadcast stations are selected by comparing the frequency-divided signal with a reference frequency signal and making them coincident with each other. The frequency dividing ratio of the PLL is changed by a time sequential signal generated from a control means and when traffic information is included at the scanning of receiving, it is received. |
