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Student Support Forum: 'Extraction of frequency data from signals' topicStudent Support Forum > General > Archives > "Extraction of frequency data from signals"

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David C. Ng
08/29/00 1:57pm

After evaluation of a time varying function, is there a quick method of getting the frequency information?
I have tried the Fast Fourier Transform example from the mathematica book, however, it not obvious how the example could be used for other problems. The frequency axis of the plot is the biggest problem, does it need to be normalized and if so how?


y[t_] = Sin[2 Pi 100 t]*Sin[2 Pi 15 t];
data = Table[y[t*20], {t, 0, 20, 1}];
ListPlot[Abs[Fourier[data]], PlotJoined -> True,
PlotRange -> All]

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Subject (listing for 'Extraction of frequency data from signals')
Author Date Posted
Extraction of frequency data from signals David C. Ng 08/29/00 1:57pm
Re: Extraction of frequency data from signals Paul Edney 09/11/00 5:56pm
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