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Extraction of FFT from each segment for computation
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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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Star Strider
am 16 Feb. 2020
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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Star Strider
am 18 Feb. 2020
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.
Siehe auch
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