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Fourier Transform (FT)
•
Time signal can be decomposed into sum of
sinusoids of different frequencies, phases and
amplitudes
•
Fourier series may be represented by frequency
spectrum
•
Time and frequency domain data can be thought
of as FT pairs
s(t) = a
0
+ a
1
sin(
ω
1
t +
ϕ
1
) + a
2
sin(
ω
2
t +
ϕ
2
) + …