FFT of a Superposition signal
4 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi,
I have a superposition signal waveform, which I am importing as a txt file, attaching the file. I would like to get the frequency components of the signal. This should be an easy code with just calling the fft function. But I am not able to see the frequency points. May be I am missing something. Could someone please help?
clc;close all
x1 = importdata('Plot-try-matlab-1.txt');
time = x1(:,1);
N = length(x1);
n = 2^nextpow2(N);
Y = fft(x1,n);
plot(Y);
Thanks for the help.
0 commentaires
Réponses (1)
Benjamin Thompson
le 11 Août 2022
Modifié(e) : Benjamin Thompson
le 11 Août 2022
Try this, and see this article on usage of the FFT to understand how to interpret the results and assign results to frequencies. Your time data does not make sense so I just plot results on a range of 1:n for frequency.
clc;close all
x1 = importdata('Plot-try-matlab-1.txt');
time = x1(:,1);
N = length(x1);
n = 2^nextpow2(N);
Y = fft(x1(:,2),n);
plot(1:n, abs(Y));
https://www.mathworks.com/help/matlab/math/fourier-transforms.html
https://www.mathworks.com/help/matlab/math/fourier-transforms.html
0 commentaires
Voir également
Catégories
En savoir plus sur Discrete Fourier and Cosine Transforms dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!