Dear David thanks a lot for your help. My final project consists on an
automatic audio segmentation system which I have implemented in matlab
modifying the Alexander Haubolds Matlab resources
[http://www.aquaphoenix.com/research/matlab/]. The modified program requires as
input the audio file (wav) and the CLAM XML file. In order to interface Matlab
with CLAM I used an XML parser which is able to extract the values of the MFCC
descriptor from the CLAM XML file. In particular I used XMLTree an XML toolbox
for Matlab
[http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=1757&objectType=file].
Thanks again
Best regards
Vincenzo
---------- Initial Header -----------
>From : "David García Garzón" [EMAIL PROTECTED]
To : [EMAIL PROTECTED]
Cc : "vincenzo.dimattia" [EMAIL PROTECTED],"clam" [EMAIL PROTECTED]
Date : Mon, 25 Feb 2008 15:16:41 +0100
Subject : Re: [CLAM] ClamExtractorExample LowFreqEnergyRelation
> On Monday 25 February 2008 12:25:24 vincenzo.dimattia wrote:
> > Dear all,I am Vincenzo Dimattia, I am developing my final project, an
> > automatic segmentation system,and I am using the programm
> > ClamExtractorExample for the extraction of the audio descriptors . I would
> > like to know how is calculated the LowFreqEnergyRelation.This should be
> > higher for low frequency signal and lower for high frequncy signal. Is it
> > right? Thanks
> > Vincenzo Dimattia
>
> Hi, Vincenzo.
>
> There was an error on doxygen description. LowFreqEnergyRelation had the
> description of MaxMagFreq. I just fixed it on the svn. The description for
> LowFreqEnergyRelation is now this one:
>
> "Ratio between the energy over 0-100 Hz band and the whole spectrum energy.
> To avoid singularities while keeping descriptor continuity, when the whole
> spectrum energy drops bellow $10^{-4}$, such value is considered as whole
> spectrum energy."
>
> So you are right with your interpretation. But keep in mind that 0-100 Hz is a
> very narrow band and it is used to spot bass sounds. If you are interested in
> locating high frequencies, HighEnergyContent is more appropiated. It is
> defined as:
>
> "Sum of the squared spectrum magnitude multiplied by the wave number of the
> bin. It is pretty similar to the derivative of the energy, or a high pass
> filter, which gives higher values for high frequency content."
>
> We would be glad if you report back to the mailinglist your progress with your
> final project :-) And, please, consider also integration of your work into
> CLAM code base. Integration into a big existing project is often appreciated
> by evaluators. Just drop us a line if you want to.
>
> David.
>
>
>
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