How to determine frequency components in a signal
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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
2017 年 3 月 6 日
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Walter Roberson
2017 年 3 月 6 日
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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