def mel_to_freq(mel):
return <NUM_LIT> * (<NUM_LIT:10> ** (mel / <NUM_LIT>) - <NUM_LIT:1>)<EOL>
Convert a value in mel to a value in Hertz.

    Parameters
    ----------
    mel : numeric
        Frequency value in mel to convert.

    Returns
    -------
    float
        Frequency value in Hertz.