Extraction of FFT from each segment for computation

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Chloe Sim 2020-2-16

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关闭： MATLAB Answer Bot 2021-8-20

Hello! I have a code doing splitting of data size of 51200 into segments of 512 and did a FFT on each segment.

How do I extract the FFT from each of the 512 segment ?

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Sindar 2020-2-16

Your question is unclear. What's already working and what do you need?

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Star Strider 2020-2-16

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If this relates to your earlier Question, the fft results are in each column of the ’P1’ matrix.

Y = fft(X-mean(X));             % FFT
f = Fs*(0:(L/2))/L;
P2 = abs(Y/L);
P1 = P2(1:numel(f),:);          % Note: Added Column Dimension (I Did Not Catch That Omission Earlier)

so the first fft would be:

FT_1 = P1(:,1);

and so for the rest.

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Chloe Sim 2020-2-18

Hello! Thank you for the fast response!

Is the code above showing each FFT of each segment? :)

Star Strider 2020-2-18

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It is showing the fft for the segments (columns) you choose. In that example, I plotted columns 1 and 20.

To show all of them in the same axes at the same time:

figure
plot(f, P2(1:numel(f),:)
grid

Experiment to get different results.

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