def METHOD_NAME(self, xp, scp):
    # switch to pinvh (tolerances could be higher with longer
    # filters, but using shorter ones is faster computationally and
    # the idea is the same)
    x = scp.signal.firls(101, [0, 0.01, 0.99, 1], [1, 1, 0, 0])
    w, h = scp.signal.freqz(x, fs=2.)
    return x, w, h