| 摘要 |
<P>PROBLEM TO BE SOLVED: To cancel DC offset components with simple constitution by canceling the DC offset components by using the DC offset components calculated from two continuous signals whose phases are mutually different by 180°. <P>SOLUTION: An orthogonal demodulator 301 separates a signal into an in-phase component and an orthogonal component. Adders 316, 326 respectively add data stored in in-phase data storage parts 314, 326 to data stored in reverse phase data storage parts 315, 325. Bit shifters 317, 327 respectively shift each bit in the right direction so as to perform arithmetic processing for calculating a half of each added value. Subtractors 319, 329 respectively subtract DC offset components calculated by respective DC offset component operation part 312, 322 from respective main line data which are outputs from A/D converters 311, 321 to obtain a base band signal comprising the in-phase component and the orthogonal component from which the DC offset components are removed. <P>COPYRIGHT: (C)2007,JPO&INPIT |
