FREQUENCY EXTRACTING APPARATUS, FREQUENCY EXTRACTING METHOD, FREQUENCY EXTRACTING PROGRAM, AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a frequency extracting apparatus or the like capable of extracting a signal with a particular frequency f without increasing a processing amount and obtaining sufficient extracting performance even when the processing capability is limited.;SOLUTION: A summation control section 12 samples an input signal In at an interval of a period T corresponding to a frequency component f desirably extracted from the input signal In under the control of a timing control section 20 and registers 14j (j=1 to k) accumulate sampled data in the same timing j (j=1 to k≤n) within the period T. After a lapse of a prescribed period, the summation control section 12 allows each absolute value processing section 16j of an absolute value processing section group 16 or the like to obtain an absolute value of the data in the registers 14j or the like. The summation control section 12 allows a total summation section 18 to obtain a total sum S of the absolute values in each absolute value processing section 16j or the like. A decision section 22 compares the total sum S with a prescribed evaluation value λ and provides an output of extracted information Dout when the signal with the prescribed frequency f can be extracted.;COPYRIGHT: (C)2005,JPO&NCIPI