`scipy.signal.sosfiltfilt`, which does forward-backward filtering like `scipy.signal.filtfilt` but for second-order sections, was added. Discrete-time linear systems ~~~~~ `scipy.signal.dlti` provides an implementation of discrete-time linear systems. where F is the Fourier transform, U the unit step function, and y the Hilbert transform of x.. In other words, the negative half of the frequency spectrum is zeroed out, turning the real-valued signal into a complex signal. The Hilbert transformed signal can be obtained from np.imag(hilbert(x)), and the original signal from np.real(hilbert(x)). ...

I am a beginner in signal processing and I would like to apply third-octave band pass filters on mp3 or wav file (yields about 30 new filtered time series) center frequencies: 39 Hz, 50 Hz, 63 Hz, 79 Hz, 99 Hz, 125 Hz, 157 Hz, 198 Hz, 250 Hz, 315 Hz, 397 Hz, 500 Hz, …

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