angel61606
Joined: Jul 8, 2020 Posts: 55

Posted: Jul 18, 2021 3:56 AM Post subject: OFFLINE FFT 

Hi Jarek i have faced an interesting challenge, here is my problem: I should get an fft of my recoded signal then I calculate its median frequency , so simple, right? but then when i want to implement it, since in bioera data is read sample by sample from XDF reader , I should apply an fft which will read data sample by sample and gives output as data stream proceeds, so to measure the median frequency of the ALL of the signal, i should apply an averaging , right? but how to calculate averaging? 1) should i average the outputs of fft then calculate the median frequency ? or 2)should i calculate fft then median frequency and then do averaging on the output of median frequency? I should admit both ways seem to have an incorrect result based on what i see from spectrograph !
Isn't there any way to calculate FFT of the signal after the stream is read completely from xdf reader? then calculate the median frequency or any required feature? 
