Doc mention cutoff frequency correction for signal.filtfilt · Issue #9371 · scipy/scipy · GitHub
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Zero-phase digital filtering - MATLAB filtfilt
scipy.signal.filtfilt — SciPy v1.4.0 Reference Guide
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Forward-Backward Filter · Issue #14 · berndporr/iirj · GitHub
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Applying digital filters in Python - Samuel Pröll - Homepage
Zero-phase filtfilt distortion of weighting filter frequency response? · Issue #240 · python-acoustics/python-acoustics · GitHub
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scipy.signal.filtfilt — SciPy v0.18.1 Reference Guide
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Compensate for Delay and Distortion Introduced by Filters - MATLAB & Simulink
scipy - Filter design and frequency extraction in Python - Stack Overflow
