tedor

I would like to understand more about the Sinusoidal Partial Analysis which is like FFT. I am wondering if I could use a filter to check the amplitude (power) of a window on the signal. 

If this is possible and the filter could give me how much power there is in the sideband between 8-14 Hz, which would be the best filter to use?

To be honest I am not even sure whether this would cause the same result what FFT gives me, but I thought it is worth a try.

ps.: Suggestion was to use a Finite impulse response. I hope I can find this in Max/MSP. Might be buffir~ I have to look at.

 I would like to understand more about the Sinusoidal Partial Analysis which is like FFT. I am wondering if I could use a filter to check the amplitude (power) of a window on the signal. 
 If this is possible and the filter could give me how much power there is in the sideband between 8-14 Hz, which would be the best filter to use?

To be honest I am not even sure whether this would cause the same result what FFT gives me, but I thought it is worth a try. 

ps.: Suggestion was to use a Finite impulse response. I hope I can find this in Max/MSP. Might be buffir~ I have to look at.


filter

heh, i don't know the first thing to answer your question, but your use of this intrigues me. Are you looking to do something like neurofeedback training? Are you recording from occipital or sensori-motor alpha band generators?

heh, i don't know the first thing to answer your question, but your use of this intrigues me.  Are you looking to do something like neurofeedback training?  Are you recording from occipital or sensori-motor alpha band generators?


Yes, I am working on a neurofeedback training patch in Max/MSP. I am recording the frontal lobe with a bipolar device (www.ibva.co.uk). I received a nice 15 Mb [object] with it where I can choose to see the "PowerPeak", "Power" and "Power percentage" in each EEG band activity (alpha, beta,....) (two hemispheres)

[...but I want to understand how FFT works, not just using it...]

As I still could not work out how to use FFT on the raw EEG signal in Max/MSP I though about finding another way. I have been told to use FIR on the raw EEG signal, which could give me the same result as FFT does > the amplitude of the partials in a freq. band.

To be honest I did not get to far yet... if you think you could help me with some hints how to use the filters, I would appreciate it!

As I still could not work out how to use FFT on the raw EEG signal in Max/MSP I though about finding another way. I have been told to use FIR on the raw EEG signal, which could give me the same result as FFT does > the amplitude of the partials in a freq. band. 

Filter