Bandpass filtering
It would be useful to add bandpass filtering to the transforms available for Waveforms. This could be implemented as a simple wrapper around a standard scipy bandpass filter function, e.g.
import scipy.signal
highpass_filter_freq = 40
b,a = scipy.signal.butter( 3, highpass_filter_freq, btype='high', fs=fs )
y = scipy.signal.filtfilt( b, a, y )
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