When zero-phase is activated for filtering and _sosfiltfilt is used, the applied order is double the argument 'order'. https://github.com/python-acoustics/python-acoustics/blob/fbc87454422c41e1a39e282d7680126a6d8014dd/acoustics/signal.py#L1127
When zero-phase is activated for filtering and _sosfiltfilt is used, the applied order is double the argument 'order'.
python-acoustics/acoustics/signal.py
Line 1127 in fbc8745