| http://www.w3.org/ns/prov#value | - al tone signal, which are targeted to be detected, are obtained. [0107] At this point, each of the power spectra may be obtained by means of hardware or software: for example, the power spectrum may be obtained by a DFT (Discrete Fourier Transform) operation in the form of software; alternatively, the DFT operation may be replaced by other methods, such as an FFT (Fast Fourier Transform) operation
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