FPGA Central

Does anybody know a ref(s) to free description of fractional octave
smoothing?

[email protected] wrote:
> Does anybody know a ref(s) to free description of fractional octave
> smoothing?

Google is your friend. try it!

http://www.wcl.ee.upatras.gr/audiogr...apers/asme.pdf

i read the abstract and i don't even know what it is about.

r b-j

robert bristow-johnson wrote:
> Google is your friend. try it!
>
> http://www.wcl.ee.upatras.gr/audiogr...apers/asme.pdf
>
> i read the abstract and i don't even know what it is about.
>
> r b-j

Agree, Google is my friend :-) But the article has nothing cobcrete,
except for a ref to the P.Hatziantoniou,J.Mourjopoulos paper.

At any case, I have found inside DRC code something like dtetrmining a
window width for a smotthing. Now, my python code looks this way:

def foClasicSmooth( x, octaveFraction = 1.0/3.0 ):
y = []
rightFactor = math.pow(2.0, octaveFraction / 2.0 )
leftFactor = 1.0 / rightFactor

for n in range(len(x)):
left = long(n * leftFactor)
right = long(n * rightFactor)
y.append( sum( x[left : right + 1] ) / (right - left + 1) )

return y

It works fine for me.

[email protected] wrote:

> Does anybody know a ref(s) to free description of fractional octave
> smoothing?

Not a reference, but source code from my libAHmath library:

http://www.huennebeck-online.de/soft...src/index.html -> Math Library

The function ReduceSpectrum::smoothLogXScale() in ReduceSpectrum.c does
smoothing for any factor.

bye
Andreas
--
Andreas Hünnebeck | email: [email protected]
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Andreas Huennebeck wrote:
> Not a reference, but source code from my libAHmath library:
>
> http://www.huennebeck-online.de/soft...src/index.html -> Math Library
>
> The function ReduceSpectrum::smoothLogXScale() in ReduceSpectrum.c does
> smoothing for any factor.
>
> bye
> Andreas

Andreas, thanks! I'll dig in.

Andrew