how can i get data sampling rate and FFT bin width?

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TH.A on 19 Dec 2021
Answered: dpb on 19 Dec 2021
hi, i have N=64 4d- fmri images with size matrix(128,128,64,90) where 90 is the number of time point and a 4d-image captured in T=2s. i want use fft matlab function. how can i calculate sample rate and fft width bin? What is the default value of the parameters fft?

Answers (1)

dpb on 19 Dec 2021
"What is the default value of the parameters fft?"
None...the fft doesn't care, the sample rate is set solely by the data collection process.
If your images were captured at a uniform rate over a time perioed of 2 sec, then the sample rate would be 90/2 --> 45 Hz.
There's an example of using FFT fo compute a one-sided PSD in the doc for FFT that illustrates the time and frequency calculations.

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