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Re: frequency to mel formula
We discussed this last year. See
and the surrounding thread.
I think the actual origin is Fant in a paper in Swedish from 1949,
summarized in his 1973 book:
Fant, C G M "Analys av de svenska konsonantljuden" LM Ericsson
protokoll H/P 1064, 1949: 139pp.
referenced on p. 48 of
Fant, G "Speech Sounds and Features", MIT Press, 1973.
but Fant uses log(1+f/1000). The log(1+f/700) was attributed to
O'Shaughnessy, D. (1978) Speech communication: Human and machine.
Addison-Wesley, New York, page 150.
On Wed, Jul 15, 2009 at 2:11 PM, James W.
> Dear List,
> On the Wikipedia page
> 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