DFT help needed
Nov 25, 2008 at 3:11pm
DFT help neededHi, i’ve created a patch that maps positions of an object at time intervals. now i want to do the dft (discrete fourier transform) or the fft(fast fourier transform) of that “position vs time” signal, so i can have the fundamental frequency of the object at a certain position! i think there is no object in Max that allows me to do that, so I have to write a external one. Does someone has any suggestion about this? is there some object that can do it? or if i have to write the external, can someone point me in the right track… thank you! best regards, baltaz 

Nov 25, 2008 at 7:40pm
Hi, Before launching into development, did you try the fft~ or pfft~ I guess we’d need to know a little more about this – is it realtime Alternatively, if you’re working with non realtime, jit.fft might be I’m not quite sure what you mean by ‘fundamental frequency at a Hope this helps in some way… Graham On Nov 25, 2008, at 7:11 AM, baltaz wrote: > Be seeing you grrr waaa 

Nov 26, 2008 at 10:22am
thanks for the help… I will try to feed the signal to that objects you mentioned fft~ or pfft~. the analysis is to be made in real time, i still don’t know how many samples would be enough to get a good result… my intention is to estimate the period of the movement that is assumed to be more/less periodic…that’s why im thinking of using the fft…do you have another suggestion?? thanks baltaz 
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