How to determine frequency components in a signal
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
Elysi Cochin
am 6 Mär. 2017
Kommentiert: Walter Roberson
am 6 Mär. 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)
0 Kommentare
Akzeptierte Antwort
Walter Roberson
am 6 Mär. 2017
4 Kommentare
Walter Roberson
am 6 Mär. 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.
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Spectral Measurements finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!