| http://www.w3.org/ns/prov#value | - 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, a maximum entropy method, a wavelet transform and a Wigner distributio
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