Convert Time Domain Signal Data into Frequency Domain

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neamah al-naffakh
neamah al-naffakh 2016-8-13
评论： Rehanos_boyzee 2020-2-4
Hi, I have dataset that contains time stamp and the acceleration data of three axes( x, y, and z) then i the data has been stored in an array called Segments This is an example of my data
Time stamp X Y Z
0 1.0195313 0.16088867 -0.26391602
0 1.0976563 0.17456055 -0.33447266
0 1.2556152 0.24926758 -0.3774414
0 1.2314453 0.517334 -0.25732422
0 1.0212402 0.5761719 -0.09277344
0 1.0727539 0.51000977 0.007324219
0 1.1694336 0.32885742 -0.017822266
0 1.1247559 0.22924805 -0.10595703
0 1.0339355 0.27905273 -0.13623047
0 0.8273926 0.24560547 -0.080566406
0 0.75097656 0.25390625 -0.018310547
0 0.67626953 0.3046875 0.051757813
0 0.7282715 0.33764648 0.08911133
0 0.8227539 0.34545898 0.08325195
0 0.87939453 0.3413086 0.08300781
0 1.0527344 0.34326172 0.106933594
0 1.1125488 0.32128906 0.10058594
0 1.1477051 0.26416016 0.06347656
0 1.2807617 0.2680664 0.015136719
0 1.2800293 0.2668457 -0.006347656
1 0.7998047 0.2043457 -0.22460938
1 0.89868164 0.16308594 -0.18432617
1 0.9472656 0.107177734 -0.19458008
1 1.0109863 0.08178711 -0.20800781
1 1.0375977 0.111328125 -0.17626953
1 0.96313477 0.13378906 -0.13134766
1 1.0727539 0.15991211 -0.08935547
1 1.041748 0.2055664 -0.0637207
1 0.9003906 0.2607422 -0.013183594
1 0.94677734 0.23095703 0.025390625
1 1.0883789 0.24560547 0.021240234
1 1.1467285 0.22265625 -0.029785156
1 1.1020508 0.23388672 -0.08325195
1 0.88549805 0.22949219 -0.068603516
1 0.8017578 0.24829102 -0.03857422
1 0.83569336 0.27197266 -0.024902344
1 0.8642578 0.34106445 -0.037353516
1 0.91308594 0.3779297 -0.017333984
1 1.0136719 0.43603516 0.04321289
1 1.0756836 0.45166016 0.06567383
1 1.0771484 0.37670898 0.028076172
I have converted the time domain signal into frequency domain signal using *fft* function
I have sent the data of x-axis only into FFT function as illustrated in the following commands
% FFTS = fft(X_Segments)
plot(FFTS)
NOTE( X_Segments is an array that contains the acceleration data of X-axis only)
the graph was so strange!as shown in the pic
Can anyone help me? Thank you so much
  6 个评论
显示 4更早的评论
neamah al-naffakh
neamah al-naffakh 2016-8-13
thank you so much mate, see the following graph! I have got only one peak for 320 value of X data !
Rehanos_boyzee
Rehanos_boyzee 2020-2-4
Can you please share your code as im trying to do something similar

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回答（1 个）

Image Analyst
Image Analyst 2016-8-13
Did I help you above such that you have no more questions?
  2 个评论
neamah al-naffakh
neamah al-naffakh 2016-8-13
iI am not sure to be honest, I am wondering if the graph is correct or not? because when I draw the data in time domain i got many peaks in the signal ! while I got only on in frequency domain signal?
Image Analyst
Image Analyst 2016-8-13
In general, you could have lots of peaks in both domains due to a variety of reasons.

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