On 11/29/13 5:56 AM, Azelio Boriani wrote:
Unfortunately that was a contribution from Magnus in 2010
(see www.febo.com/pipermail/time-nuts/2010-April/046932.html )
that I have simply reported without verifying the link and found that
link unusable after sending the message. My best guess is this:
http://www.crya.unam.mx/radiolab/recursos/Allan/Kasdin-Walter.pdf
based on a search on FLFM (flicker of frequency).
one limitation of the Kasdin-Walter method is that it is "batch mode",
and doesn't lend itself to an implementation which is continuous.
The paper does have a nice discussion of why the "white noise into a
filter" technique doesn't work very well if the slopes you need aren't
integer powers of frequency. Integer powers in frequency correspond to
rational functions in filter characteristics, which are straightforward,
but how do you make a 1.5th order filter section or half a pole or zero?
The fractal literature, though, may provide mechanisms that might be
useful.
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