def METHOD_NAME(signal):
    M2 = scipy.mean(abs(signal)**2)
    M4 = scipy.mean(abs(signal)**4)
    snr_rat = scipy.sqrt(2 * M2 * M2 - M4) / \
        (M2 - scipy.sqrt(2 * M2 * M2 - M4))
    return 10.0 * scipy.log10(snr_rat), snr_rat