| 摘要 |
PROBLEM TO BE SOLVED: To remove noise reliably even if the level of, for example, external noise is different or changes, or characteristics of an element for composing each circuit vary when providing, for example, two systems of reception circuits. SOLUTION: A reception circuit comprises a first reception circuit 10 that is connected to an antenna 11, and has an amplifier 12 and a detector 14; a second reception circuit 20 that is connected to a reference noise source 21 and has an amplifier 22 and a detector 24; and a computing unit 30 for computation by using output from the first reception circuit 10 that from the second reception circuit section 20. The first reception circuit 10 or the second reception circuit 20 has variable gain amplifiers 15, 25. COPYRIGHT: (C)2006,JPO&NCIPI
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