check default frequencies w, terminology norw n_or_w ... normalization of the power spectrum, spectral density: not checked yet, for example no variance of .... PyFFTW provides a way to replace a number of functions in scipy.fftpack with its ... the values y[n] for negative frequencies (because the spectrum is symmetric).. Feb 6, 2018 — Fig 1. FFT of 50 Hz sine wave sampled at 1 millisecond (0.001 sec). Lower plot is the Fourier Transform amplitude spectrum. baf94a4655 phyrleve
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