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Tabla Transformadas de Fourier, Resúmenes de Cálculo para Ingenierios

Transformadas de Fourier de funciones definidas para no tener que resolver la integral.

Tipo: Resúmenes

2020/2021

Subido el 26/12/2021

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Signals & Systems - Reference Tables 1
Table of Fourier Transform Pairs
Function, f(t) Fourier Transform, F(!)
Definition of Inverse Fourier Transform
!
!
!"
!!!
"
!deFtf tj
)(
2
1
)(
Definition of Fourier Transform
!
!
!"
"
!dtetfF tj!
!)()(
)( 0
ttf !0
)( tj
eF !
!
!
tj
etf 0
)( !)( 0
!! !F
)( t
f
!
)(
1
!
"
!
F
)(t
F
)(2 !" !
f
n
n
dt
tfd )( )()( !! Fj n
)()( tfjt n
!
n
n
d
Fd
!
!)(
!
!"
t
df !! )( )()0(
)( !"#
!
!F
j
F!
)(t!1
tj
e0
!)(2 0
!!"# !
(t)sgn
!j
2
pf3
pf4
pf5

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Signals & Systems - Reference Tables (^) 1

Table of Fourier Transform Pairs

Function, f(t) (^) Fourier Transform, F(! )

Definition of Inverse Fourier Transform

!

!

"!

! f t F e d

j t ( ) 2

Definition of Fourier Transform

!

!

"!

" F! f te dt

j! t (! ) ()

f ( t! t 0 ) F (! ) e! j! t^0

j t f ( t ) e^0

F! !! 0

f (! t ) ( )

F

F ( t ) 2 " f (!!)

n

n

dt

d f ( t ) ( j! ) F (!)

n

( jt ) f ( t )

n ! n

n

d

d F

!

! "!

t f (! ) d! (^0 ) ( )

F

j

F

! ( t ) 1

j t e^0

sgn (t)

j!

Fourier Transform Table UBC M267 Resources for 2005

F (t) F￿ (ω) Notes (0)

f (t)

￿ (^) ∞

−∞

f (t)e−iωt^ dt Definition. (1)

1 2 π

￿ (^) ∞

−∞

f^ ￿ (ω)eiωt^ dω f￿ (ω) Inversion formula. (2)

f^ ￿ (−t) 2 πf (ω) Duality property. (3)

e−at^ u(t)

1 a + iω

a constant, ￿e(a) > 0 (4)

e−a|t|^

2 a a^2 + ω 2

a constant, ￿e(a) > 0 (5)

β(t) =

￿ 1 , if |t| < 1, 0 , if |t| > 1

2 sinc(ω) = 2

sin(ω) ω

Boxcar in time. (6)

1 π

sinc(t) β(ω) Boxcar in frequency. (7)

f ￿^ (t) iω f￿ (ω) Derivative in time. (8)

f ￿￿^ (t) (iω)^2 f￿ (ω) Higher derivatives similar. (9)

tf (t) i

d dω

f￿ (ω) Derivative in frequency. (10)

t 2 f (t) i^2

d^2 dω 2

f￿ (ω) Higher derivatives similar. (11)

eiω^0 t^ f (t) f￿ (ω − ω 0 ) Modulation property. (12)

f

￿ t − t (^0) k

￿ ke−iωt^0 f￿ (kω) Time shift and squeeze. (13)

(f ∗ g)(t) f￿ (ω)￿g(ω) Convolution in time. (14)

u(t) =

￿ 0 , if t < 0 1 , if t > 0

1 iω

  • πδ(ω) Heaviside step function. (15)

δ(t − t 0 )f (t) e−iωt^0 f (t 0 ) Assumes f continuous at t 0. (16)

eiω^0 t^2 πδ(ω − ω 0 ) Useful for sin(ω 0 t), cos(ω 0 t). (17)

Convolution: (f ∗ g)(t) =

￿ (^) ∞

−∞

f (t − u)g(u) du =

￿ (^) ∞

−∞

f (u)g(t − u) du.

Parseval:

￿ (^) ∞

−∞

|f (t)|^2 dt =

1 2 π

￿ (^) ∞

−∞

￿ ￿ ￿ f￿^ (ω)

￿ ￿ ￿

2 dω.

Signals & Systems - Reference Tables (^) 3

u ( t ) e sin( 0 t )

t !

!!

2 2 0

0

! (" !)

!! j

t e

!!

2 2

t^2 /( 2!^2 ) e

! 2 2 / 2 2

"! "!

! e

t u te

!! ( )

"! j!

t u tte

!! ( ) 2 ( )

"! j!

! Trigonometric Fourier Series

!^!^ "

!

"

1

( ) 0 cos( 0 ) sin( 0 ) n

f t a an! nt bn! nt

where

!

!!

T

n

T T n

f t nt dt T

b

f t nt dt T

f tdt a T

a

0

0

0

0 0 0

()sin( )

()cos( ) ,and

! Complex Exponential Fourier Series

" (^)!

!

"

#!"

T j nt n n

j nt n f te dt T

f t Fe F 0

( )! ,where^1 ()!^0

Signals & Systems - Reference Tables (^) 4

Some Useful Mathematical Relationships

cos( )

jx jx e e x

! ! "

j

e e x

jx jx

sin( )

! ! "

cos( x " y )!cos( x )cos( y )!sin( x )sin( y )

sin( x! y )"sin( x )cos( y )!cos( x )sin( y )

cos( 2 ) cos ( ) sin ( )

2 2 x " x! x

sin( 2 x )! 2 sin( x )cos( x )

2 cos ( ) 1 cos( 2 )

2 x "! x

2 sin ( ) 1 cos( 2 )

2 x "! x

cos ( ) sin ( ) 1

2 2 x " x!

2 cos( x ) cos( y )"cos( x $ y )#cos( x # y )

2 sin( x ) sin( y )"cos( x! y )!cos( x # y )

2 sin( x ) cos( y )#sin( x " y )!sin( x! y )

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Engineering Tables/Fourier Transform Table 2

From Wikibooks, the open-content textbooks collection

< Engineering Tables Jump to: navigation, search

Signal

Fourier transform unitary, angular frequency

Fourier transform unitary, ordinary frequency

Remarks

10 The rectangular pulse and the normalized sinc function

11

Dual of rule 10. The rectangular function is an idealized low-pass filter, and the sinc function is the non-causal impulse response of such a filter.

12 tri is the triangular function

13 Dual of rule 12.

14

Shows that the Gaussian function exp( - a t

2 ) is its own Fourier transform. For this to be integrable we must have Re(a) > 0.

common in optics

a>

the transform is the function itself

J 0 (t) is the Bessel function of first kind of order 0, rect is the rectangular function

it's the generalization of the previous transform; T (^) n (t) is the Chebyshev polynomial of the first kind.

Un (t) is the Chebyshev polynomial of the second kind

Retrieved from "http://en.wikibooks.org/wiki/Engineering_Tables/Fourier_Transform_Table_2"

Category: Engineering Tables

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