How to use fft2 and find spatial wavenumbers (kx & ky) ?

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Nitesh Anerao
Nitesh Anerao on 20 Feb 2015
Answered: Daniel kiracofe on 11 Nov 2016
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These are (5x5) arrayi.e 25 microphones arranged in 2-d space and each captures say 10000 samples/sec of data in time domain and this data is been stored in notepad as [10000(samples) x 25(mic's)] ,now i have data which is temporal and spatial hence I am stuck up with usage of FFT2.
  1. I finally want to find fft2 of spatial data(x,y) and not temporal data
  2. find kx and ky if possible
  3. find the frequency of wave from mic data ?
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fs pramudya
fs pramudya on 7 Nov 2016
Hi there, have you find the answer of this question? i am new using matlab and encountering same problem. thanks!

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Answers (1)

Daniel kiracofe
Daniel kiracofe on 11 Nov 2016
First, you need to reshape your data so that it is 10000x5x5 instead of 10000x25 ("reshape" command could help here).
Then, assuming it is stored in a variable called "data", and that you want to find the spatial fft at sample "i" you could just do
result = fft2( squeeze( data(i,:,:) ) );

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