Convert between frequency in Hz and in psychoacoustic mel units.

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`hz` |
a frequency in Hertz (cycles per second). |

`mel` |
a frequency in mel units. |

These functions convert between the linear Hertz and psychoacoustic Mel scales. The functions use formulas provided by Rietveld & Van Heuven (2009).

A frequency of 1000 Hz equals 1000 mel. For frequencies below 1000 Hz the mel scale is approximately linear; for frequencies above 1000 Hz the mel scale is approximately logarithmic.

Transformed value(s) in mel or hertz units.

Rietveld, A. C. M., & Van Heuven, V. J. (2009). Algemene Fonetiek (3rd ed.). Bussum: Coutinho.

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