code: def mel_frequencies(n_mels=128, fmin=0.0, fmax=11025.0, htk=False):
      """
      This function is cloned from librosa 0.7.
      Please refer to the original
      `documentation <https://librosa.org/doc/latest/generated/librosa.mel_frequencies.html?highlight=mel_frequencies#librosa.mel_frequencies>`__
      for more info.
  
      Parameters
      ----------
      n_mels    : int > 0 [scalar]
          Number of mel bins.
  
      fmin      : float >= 0 [scalar]
          Minimum frequency (Hz).
  
      fmax      : float >= 0 [scalar]
          Maximum frequency (Hz).
  
      htk       : bool
          If True, use HTK formula to convert Hz to mel.
          Otherwise (False), use Slaney's Auditory Toolbox.
  
      Returns
      -------
      bin_frequencies : ndarray [shape=(n_mels,)]
          Vector of n_mels frequencies in Hz which are uniformly spaced on the Mel
          axis.
  
      Examples
      --------
      >>> librosa.mel_frequencies(n_mels=40)
      array([     0.   ,     85.317,    170.635,    255.952,
                341.269,    426.586,    511.904,    597.221,
                682.538,    767.855,    853.173,    938.49 ,
               1024.856,   1119.114,   1222.042,   1334.436,
               1457.167,   1591.187,   1737.532,   1897.337,
               2071.84 ,   2262.393,   2470.47 ,   2697.686,
               2945.799,   3216.731,   3512.582,   3835.643,
               4188.417,   4573.636,   4994.285,   5453.621,
               5955.205,   6502.92 ,   7101.009,   7754.107,
               8467.272,   9246.028,  10096.408,  11025.   ])
      """
  
      # 'Center freqs' of mel bands - uniformly spaced between limits
      min_mel = hz_to_mel(fmin, htk=htk)
      max_mel = hz_to_mel(fmax, htk=htk)
  
      mels = np.linspace(min_mel, max_mel, n_mels)
  
      return mel_to_hz(mels, htk=htk)
  
file_path: nnAudio/Installation/nnAudio/librosa_functions.py
imports: import numpy
  import warnings
label_desc: Use image node_id 6 for calling a global function with example usage: mel_frequencies(n_mels, fmin, fmax, htk) and returns: mel_to_hz