[Clam-devel] MFCC Loops

[paul simmons]

well, let me change the question then. is there a "code" sample for
doing spectral analysis with overlapping windows (ie using windowsize
and hopsize parameters)?



On Mon, Sep 7, 2009 at 8:24 PM, Pau Arumí<pau.arumi at barcelonamedia.org> wrote:
> Hi Paul,
> I didn't understand exactly where the problem is.
> (However I think the most qualified to answer you is David Garcia who is
> currently on holidays. He'll be back in a week or two.)
>
> Cheers
> P
>
> El dl 07 de 09 de 2009 a les 16:54 +0200, en/na paul simmons va
> escriure:
>> Hi,
>> I am trying to do MFCC extraction. As far as I get; the steps are
>>
>> Read an "Audio"
>> Run "SpectralAnalysis" on output of "Audio"
>> Run "MelFilterBank" on output of "SpectralAnalysis"
>> Run "CepstralTransform" on output of "MelFilterBank"
>>
>> right?
>>
>> If so; I cannot understand where to do looping, for example if I do:
>>
>>     while(mReader.Do(audio))
>>     {
>>         spectralAnalysis.Do(audio, spectrum);
>>         melFilterBank.Do(spectrum, melSpectrum);
>>         cepstralTransform.Do(melSpectrum, melCepstrum);
>>
>>         CLAM::XMLStorage::Dump(audio,"Audio",a);
>>         CLAM::XMLStorage::Dump(spectrum, "Spectrum",s);
>>         CLAM::XMLStorage::Dump(melSpectrum, "MelSpectrum",m);
>>         CLAM::XMLStorage::Dump(melCepstrum, "MelCepstrum",n);
>>     }
>>
>> it applies mfcc to each read audio patch (mentioned by Audio.SetSize)
>> and got one MFCC feature vector. But I cannot understand how
>> WindowSize or HopSize is applied in this fashion. Because since Audio
>> is read in non-overlapping windows with mReader.Do(), overlapped
>> windows are run only for current audio part
>>
>> I think there must be another , more correct way to get overlapping
>> windows continuesly in whole audio, but cannot find it. Any ideas?
>>
>> Thanks...
>>
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