How does the FFT of a sine wave change as you vary the amplitude and frequency with the aid of diagram?

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How does the FFT of a sine wave change as you vary the amplitude and frequency with the aid of diagram?

2006-08-14 02:10:33 · 3 answers · asked by space 2 in Science & Mathematics ➔ Physics

3 answers

The amplitude is complex. ;-)

The link attached may help?

2006-08-14 02:22:26 · answer #1 · answered by Anonymous · 2⤊ 0⤋

FFT (Fast Fourier Transform) works on a set number of numeric samples from your signal.

You will therefore get a lot of energy on the values of the sin frequency (ies) during the sample, and a bit at weird places, due to the fact that you're working on a finite set of samples.

2006-08-14 09:31:32 · answer #2 · answered by Anonymous · 0⤊ 0⤋

If it's a truly perfect sinewave (and those are more difficult to generate than you might think ) then its Fourier Transform will consist of a line at 2Ïf with amplitude = amplitude of the source wave.

Doug

2006-08-14 09:21:03 · answer #3 · answered by doug_donaghue 7 · 0⤊ 0⤋