Table of Fourier Transform Pairs of Energy Signals Function name Time Domain x(t) Frequency Domain X(ω) FT ( ) x t ( ) ( ) ( ) { } e j t X x t dt x t ω ω ∞ −
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Table of Fourier Transform Pairs of Energy Signals Function name Time Domain x(t) Frequency Domain X(ω) FT ( ) x t ( ) ( ) ( ) { } e j t X x t dt x t ω ω ∞ −
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Table of Fourier Transform Pairs of Energy Signals
Function
nameTime Domain x(t) Frequency Domain X()
FT xt e jtXxtdtxt
F IFT 1 1 e 2 jt xtXdX FXRectangle
Pulse 1 2 0 T t tt rect TT elsewhen sinc 2 T TTriangle
Pulse 1 0 t ttW W W elsewhen 2 sinc 2 W W Sinc Pulse sin() sinc Wt Wt Wt 1 2 rect WWExponen-
tial Pulse 0 at ea 222a a
Gaussian
Pulse 2 2 exp() 2 t 222exp()
2Decaying
Exponen-
tial exp()()Re0atuta 1 aj Sinc 2 Pulse 2 sincBt 2 1 BBRect Pulse
0 0.5 1 1.5 -3-2.5-2-1.5-1-0.500.511.522.53 a r ect a T=1Sinc Pu
lse -0.5 0 0.5 1 1.5 -3-2.5-2-1.5-1-0.500.511.522.53 a Si n c a W=1Gaussian Pulse
0 0.5 1 1.5 -3-2 .5-2-1.5-1-0.500.511.522.53 a 2 =1Triangle Pulse
0 0.5 1 1.5 -3-2.5-2-1.5-1-0.500.511.522.53 a W=1BAF Fall 2002 Page 1 of 4
Table of Fourier Transform Pairs of Power Signals
Function
nameTime Domain x(t) Frequency Domain X()
FT xt e jtXxtdtxt
F IFT 1 1 e 2 jt xtXdX FXImpulse
()t 1 DC 1 2()Cosine
0 cost 00 jj ee Sine 0 sint 00 jj jeeComplex
Exponential
0 expjt 0 2()Unit step
10 00 t ut t 1 jSignum
10 sgn() 10 t t t 2 jLinear
Decay 1 t sgn()jImpulse
Train s n tnT 22k ss k TT
Fourier
Series
0 jkt k k ae , where 0 jkt te 0 0 1 k T ax T dt 0 2 k k akBAF Fall 2002 Page 2 of 4
Table of Fourier Transforms of Operations
Operation
FT Property
Given gtG
Linearity aftbgtaFbG
Time Shifting
0 0 e jt gttGTime Scaling
1 ()gatG aaModulation (1)
00 1 cos 2 gttGG 0Modulation (2)
0 0 e jt gtGDifferentiation If
dgt ft dt , then ()FjGIntegration If
t ftgd , then 1 ()0FGG jConvolution
gtftGF gtftgft , where dMultiplication
1 2 ftgtFGDuality
If gtz, then 2ztg
Hermitian Symmetry
If g(t) is real valued then
GG- (G-Gand G-G)Conjugation
gtGParseval's Theorem
2212 avg