Fractional Octave Smoothing

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

a@gaydenko.com 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/audiogroup/Publications/Full%20Papers/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/audiogroup/Publications/Full%20Papers/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.

a@gaydenko.com 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/software/download/src/index.html -> Math Library

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

bye
Andreas
-- 
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Andreas Huennebeck wrote:
> Not a reference, but source code from my libAHmath library:
>
> http://www.huennebeck-online.de/software/download/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