Determine frequency of signals

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Muhammad Mirza Murad
Muhammad Mirza Murad2022-1-14
回答: Chunru ,2022-1-14
Hi, how do I determine the frequency of this signal?
I got this from a .mat file
x = load('signal1.mat');
plot(x.x);

回答(1 个)

Chunru
Chunru 2022-1-14
load signal1
fs = 1; % normalized freq
y = abs(fft(x));
L = length(y);
f = (0:round(L/2)-1)/L*fs;
p = y(1:round(L/2));
[pmax, imax] = max(p);
plot(f, p, 'b-', f(imax), pmax, 'r*')
fprintf('The freq: %f\n', f(imax))
The freq: 0.012195

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