| 摘要 |
In a heterodyne receiver, the effect of an image interference signal that occurs in a case where a low intermediate frequency is used is alleviated. Circuits ( 12 I), ( 12 Q), ( 13 I), ( 13 Q), and ( 14 ) are provided to switch a heterodyne system between an upper heterodyne system and a lower heterodyne system. The switching circuits ( 12 I) to ( 14 ) switch the heterodyne system into one of the upper heterodyne system and the lower heterodyne system with less image interference on the basis of each reception frequency.
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