| 摘要 |
PROBLEM TO BE SOLVED: To easily receive radio wave signals of different communication standards without making a circuit configuration complicated. SOLUTION: One of first, second and third tuning circuits 38, 40 and 42 is selected in accordance with radio wave signals of different communication standards and one of first and second demodulation circuits 58 and 60 is selected in accordance with the communication standards of a radio wave signal, thereby switching radio wave signals of different communication standards in the unit of a step frequency that is set in accordance with the selected tuning circuit. COPYRIGHT: (C)2008,JPO&INPIT
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