| http://www.w3.org/ns/prov#value | - As shown in FIGS. 6A and 6B, the filtering unit 240 filters out some special interference frequency components 232, their center frequencies equal the sum of multiples of the sampling rate 234 and the intermediate frequency IF236, i.e., ffiltered=n*fs+IF, where n is an integer which is not equal N. The useful frequency component S232 whose center frequency is fwanted=fc=N*fs+IF is not filtered out
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