tedor

I am still working on my EEG patch, after getting help here, I got further. Now I would like to know how I could use fft to get the same result as on these video extracts >

http://www.tedor2.extra.hu/video/ibvaraw.mov

http://www.tedor2.extra.hu/video/ibvafftbar.mov

http://www.tedor2.extra.hu/video/ibvafft.mov

and this is how the raw hex data becomes a float (thanks to Chris Muir) and a signal.

http://www.tedor2.extra.hu/video/maxraw.mov

If someone could give me a tip how to use fft on this raw data to get the bandwidths!

raw data
     (this what I think to have in max/msp)

     http://www.tedor2.extra.hu/video/ibvaraw.mov

     http://www.tedor2.extra.hu/video/ibvafftbar.mov

     http://www.tedor2.extra.hu/video/ibvafft.mov

and this is how the raw hex data becomes a float (thanks to Chris Muir) and a signal. 

     http://www.tedor2.extra.hu/video/maxraw.mov

fft-help-needed

I am not quite sure what you are after, what the 2 signals you have in max are, but did you try [spectroscope~] ? 

As far as I can see the 2d version of fft is a normal 1D fft applied to both signals. The 3d version you refer to seems to be a spectrogram, which can also be obtained with [spectroscope~] (but then without the color to height mapping, so it's 2D].

If that object doesn't suit your needs you might want to look into a combination of a pfft patch and the jitter audio objects, followed by the actual visualisation for which you have many options using jitter(gl or not gl) objects

A good start would be to look at the patches made by Jean Francois Charles on 

https://cycling74.com/twiki/bin/view/Share/Jean-francoisCharles

Hi Krisztian, 
I am not quite sure what you are after, what the 2 signals you have in max are, but did you try [spectroscope~] ? 
As far as I can see the 2d version of fft is a normal 1D fft applied to both signals. The 3d version you refer to seems to be a spectrogram, which can also be obtained with [spectroscope~] (but then without the color to height mapping, so it's 2D]. 

If that object doesn't suit your needs you might want to look into a combination of a pfft patch and the jitter audio objects, followed by the actual visualisation for which you have many options using jitter(gl or not gl) objects
A good start would be to look at the patches made by Jean Francois Charles on https://cycling74.com/twiki/bin/view/Share/Jean-francoisCharles
and the jitter tutorials of this objects

yes, I was trying both, [spectroscope~] and [scope~] that is in the help file of fft. 

I thought I just need to connect the signal, I made from the raw EEG with the FFT object and then I will see the bandwidths (alfa , beta, ...). 

But I think I did not understand fft. I know people use it with the raw EEG data, to see the amplitude of the different sidebands.

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FFT help needed