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

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TH.A
TH.A 2021-12-19
回答： dpb 2021-12-19
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?

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dpb
dpb 2021-12-19
"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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