| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the load of DFT operation when signal components of different frequencies are to be extracted by DFT operation from signals containing a plurality of known frequency components, and thereby to shorten the time taken to accomplish the operation. <P>SOLUTION: A frequency component extracting device comprises a data input unit to which sampling data of signals including at least signals of a first frequency and signals of a second frequency higher than the first frequency are inputted; a DFT operation unit that extracts desired frequency components from the input data by discrete Fourier transform; and an arithmetic operation control unit that extracts signal of the second frequency from the sampling data by using the DFT operation unit, takes out data from the sampling data at a rate matching the ratio between the first frequency and the second frequency, and extracts signals of the first frequency from the remainder of data after subtraction of extracted signal components of the second frequency by using the DFT operation unit. <P>COPYRIGHT: (C)2013,JPO&INPIT |
