code: def filterbank_mel(sr, n_freq, n_mels=128, fmin=0.0, fmax=None, htk=False, norm=1):
      
      return mel(sr, (n_freq - 1) * 2, n_mels=n_mels, fmin=fmin, fmax=fmax
                 , htk=htk, norm=norm).astype(K.floatx())
docs: [np]