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

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Nitesh Anerao
Nitesh Anerao 2015-2-20
回答： Daniel kiracofe 2016-11-11
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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 2016-11-7
Hi there, have you find the answer of this question? i am new using matlab and encountering same problem. thanks!

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回答（1 个）

Daniel kiracofe
Daniel kiracofe 2016-11-11
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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