Dear List, On the Wikipedia page http://en.wikipedia.org/wiki/Mel_frequency_scale a formula for computing frequency in terms of mels is given as: mel = log(1 + fr/700)*1127 . It is easily inverted to fr = 700*exp(mel/1127 - 1) . My question is: Where do these formulas come from? I.e., I need a journal reference for these formulas. Thanks much, Jim Beauchamp Univ. of Illinois at Urbana-Champaign