How to determine frequency components in a signal
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Elysi Cochin
el 6 de Mzo. de 2017
Comentada: Walter Roberson
el 6 de Mzo. de 2017
How to determine the different dominant frequency components in a signal (for the whole signal duration and for specific periods)? Signal is of dim (400 x 1)
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Walter Roberson
el 6 de Mzo. de 2017
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Walter Roberson
el 6 de Mzo. de 2017
mask = time >= beginning_of_period & time <= end_of_period;
selected_samples = samples(mask);
fft_of_selected = fft(selected_samples);
"spectrogram(signal), gives me a complex value?"
Yes. spectrogram does a series of discrete fourier transforms (fft). fft() of a real-valued signal is going to be complex except in the case that the signal is made up of pure sine tones that all started at the first sample. The complex portion of the entries express phase information.
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