__init__.py 文件源码

def butter_lowpass_filter(data, cut, fs, order, zero_phase=False):
    from scipy.signal import butter, lfilter, filtfilt

    nyq = 0.5 * fs
    cut = cut / nyq

    b, a = butter(order, cut, btype='low')
    y = (filtfilt if zero_phase else lfilter)(b, a, data)
    return y