| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a demodulation device capable of eliminating noise in input signals and demodulating them. <P>SOLUTION: The demodulation device includes: a demodulation part for outputting signals of IQ coordinates by demodulating the input signals; and a first noise elimination circuit for eliminating the noise in the signals of the IQ coordinates outputted by the demodulation part. The first noise elimination circuit includes: a first subtractor (601) for subtracting first noise replica signals from the signals of the IQ coordinates outputted by the demodulation part; an error information generation part (602) for computing error information of the output signals of the first subtractor relative to the ideal signal point of the IQ coordinates; a first frequency detection part (603) for detecting the frequency of the noise on the basis of the error information; and a first amplitude adjustment part (608) for adjusting the amplitude of the first noise replica signals on the basis of the error information and the frequency of the noise detected by the first frequency detection part, and outputting the first noise replica signals to the first subtractor. <P>COPYRIGHT: (C)2012,JPO&INPIT |
