@staticmethod
    def erb_space(N, freq_base, freq_max):
        EarQ = 9.26449
        minBW = 24.7
        qw = EarQ * minBW
        arr = np.arange(1., N+1, 1., dtype=np.double)
        f_cents = np.exp(arr*(np.log(freq_base+qw)-np.log(freq_max+qw))/N)\
                * (freq_max+qw) - qw
        return f_cents
dataset/ETHPy150Open dongying/dear/dear/spectrum/auditory.py/GammatoneSpectrum.erb_space/original