![]() ![]() If it is not possible to compute a single modified periodogram in a If possible, the function computes a single modified periodogram of pspectrum returns the segment-by-segment power spectrum, which is already squared but is divided by a factor of ∑ n g ( n ) before squaring.įor one-sided transforms, pspectrum adds an extra factor of 2 to the spectrogram. Spectrogram returns the STFT, whose magnitude squared is the spectrogram. To make the outputs equivalent, remove the final segment and the final element of the time vector. If a signal cannot be divided exactly into k = ⌊ N x - L M - L ⌋ segments, spectrogram truncates the signal whereas pspectrum pads the signal with zeros to create an extra segment. Alternatively, you can specify the vector of frequencies at which you want to compute the transform, as in this example. However, for one-sided transforms, which are the default for real signals, spectrogram uses 1024 / 2 + 1 = 513 points. You can specify this number if you want to compute the transform over a two-sided or centered frequency range. Pspectrum always uses N DFT = 1024 points when computing the discrete Fourier transform. The leakage ℓ and the shape factor β of the window are related by β = 40 × ( 1 - ℓ ). Pspectrum always uses a Kaiser window as g ( n ). Specify the window length and overlap directly in samples. ![]()
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