Crate bids_filter 

Butterworth IIR filter with zero-phase filtfilt.

Implements scipy.signal.butter + scipy.signal.filtfilt for anti-alias filtering before downsampling, as used by PyBIDS.

Functions

butter_bandpass

Butterworth band-pass filter coefficients.

butter_highpass

Butterworth high-pass filter coefficients.

butter_lowpass

Butterworth low-pass filter coefficients.

filtfilt

Zero-phase filtering: apply filter forward, then backward.

lfilter

Direct-form II transposed IIR filter (single-pass).

notch_filter

Notch (band-stop) filter using second-order IIR sections.

resample

Resample a signal from fs_old to fs_new using linear interpolation.