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mathematics
(Coined in a 1963 paper by Bogert, Healey, and
Tukey) The
Fourier transform
of the log-magnitude spectrum:
fFt(ln( | fFt(window . signal) | ))
This function is used in
speech recognition
and possibly
elsewhere. Note that the outer transform is NOT an inverse
Fourier transform (as reported in many respectable DSP texts).
[What's it for?]
(1997-01-07)