Conversion between acoustic and auditory units of pitch
and calculation of auditory intervals and distances
Mel: L.L. Beranek (1949) Acoustic Measurements, New York: Wiley.
ERB: B.C.J. Moore and B.R. Glasberg (1983) "Suggested formulae for calculating auditory-filter bandwidths and excitation patterns" J. Acoust. Soc. Am. 74: 750-753.
Bark: H. Traunmüller (1990) "Analytical expressions for the tonotopic sensory scale" J. Acoust. Soc. Am. 88: 97-100.