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TRANSFORMASI INTEGRAL
(Transformasi Laplace dan konvolusi)
ole !
"elompok ##
#$ Laila%ul I&&a (#''##')
'$ Nur *Aini (#+'##',)
-$ .aroro%u% /a0ama(#+'##''1)
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Laplace
Misalkan F(%) sua%u fun2si % dan % 3 4maka%ransformasi Laplace dari F(%) dino%asikan den2anL5F(%)6 7an2 di de8nisikan ole!
L5F(%)6 9 F(%) d% 9 f(s)
"arena L5F(%)6 adala in%e2ral %ak 0a:ar den2an;a%as a%as %ak in22a() maka !
dt t F e
s f dt t F et f L
st
p
st
Lim )(
)()()}({
0
0
−∞
∞→
−∞
∫
∫ =
==
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Teorema
F(t) L{F(t)}
1 , s > 0
t , s > 0
t2 , s > 0
t nn= 0,1,2,3,4...
, s > 0
e at , s > 0
Sin at
, s > 0
s1
1
!+n s
n
a s −
1
2
1
s
s32
22
a s
s
+
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Teorema
F(t) L{F(t)}
Cos at ,s > 0
sinh at ,s > │a│
cosh at,s > │a│
t Cos at
F(t) L{F(t)}
Cos at ,s > 0
sinh at ,s > │a│
cosh at,s > │a│
t Cos at
22 a s s+
222
2
)( a sa s
−−
22 a s
s
−
22 a s
s
−
222 )( a s
s
+
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con%o soal! Ten%ukan %ransformasi laplace dari
=a0a; !
k t F =)(
[ ]
[ ][ ]ee
ee
s
k
sk
e s
k
dt ek
s f k et F L
s s
st
st
st
0
)0()(
0
0
0
)()}({
−−=
−−=
∞−−=
−=
==
∞−
−∞−
−
∞−
−∞
∫
∫
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[ ]
s
k
s
k
s
k
e s
k
e
=
−−=
−∞−=
−−=∞
10
11
1 0
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Me%ode %ransformasi laplace1. Metode Langsung Berkaitan dengan
Difnisi
Me%ode ini ;erkai%an den2an de8nisi ;eriku%!L5F(%)6 9 F(%)d%
9
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con%o soal!
Ten%ukan %ransformasi laplace dari
L5F(%)69F(%)d%f(s)9 d%
9 d% 9 >
9 > >6
9 > >6
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9 > >6
9 > > #6 9 > > #6
f(s) 9
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'$ Me%ode /ere%
Misalkan F(%) mempun7ai uraian dere%pan2ka% 7an2 di;erikan ole fun2si;eriku%!
F(%)9? % ? ? ?$$$ 9
Maka %ransformasi laplacen7a dapa%diperole den2an men:umlakan%ransformasi se%iap sukun7a dalam
dere%4sein22a !
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L5F(%)69L56?L5% 6?L56?L56?$$$
9 ? ? ? $$$
9
S7ara% ini ;erlaku :ika dere%n7akonver2en un%uk s 3
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siat-siat transormasi laplace#$ Sifa% Linear
=ika dan adala se;aran2 kons%an%a4sedan2kan dan adala fun2si>fun2siden2an %ransformasi>%ransformasi Laplacemasin2>masin2 dan 4 maka
.uk%i
1c 2c
)(1 t F )(2 t F
)(1 s f )(2 s f
)()()}()({ 22112211 s f c s f ct F ct F c L +=+
∫
∞−
+=+ 0 22112211 )}()({)}()({ dt t F ct F cet F ct F c L st
∫ ∫ ∞
−∞
− +=0
22
0
11 )()( dt t F cedt t F ce st st
∫ ∫
∞−
∞− +=
0
2
0
211 )()( dt t F ecdt t F ec st st )()( 2211 s f c s f c +=
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@on%o soal
#$
s s
352 −=
}3{}5{}35{}35{ Lt Lat Lt L −=−=−
}1{3}{5 Lt L −=
s s1315
2 −=
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'$ Sifa% Turunan
:ika maka
karena 4 maka
)()}({ s f t F L = )0()()}('{ F s sf t F L −=
)()()}({0
s f dt t F et F L st
== ∫
∞−
dt t F et F L st ∫ ∞
−=0
)(')}('{
∫ ∞
−=0
)(t dF e st
∫ ∞
−+−=0
)()0(0 dt t F e s F st
)0()( F s sf −=
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=ika maka
/en2an cara 7an2 sama diperole
Akirn7a den2an men22unakan induksima%ema%ika dapa% di%un:ukkan ;a0a4 :ika
maka !
)0()()}('{ F s sf t F L −=
)(')0()()}(''{ 2 s F sF s f st F L −−=
dt t F et F L st )(''')}('''{0
∫ ∞
−= )0('')0(')0()( 23 F sF F s s f s −−−=
)()}({ s f t F L =
)0()0(...)0(')0()()}({ )1()2(21)( −−−− −−−−−= nnnnn F sF F s F s s sf t F L
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-$ Sifa% In%e2ral
=ika maka
;uk%imisal maka
/en2an men%ransformasikan Laplace padakedua piak4 diperole !
=adi diperole !
)()}({ s f t F L = s
s f duu F L
t )(
)(0
=
∫
∫ =t
duu F t G0
)()( 0)0()()(' == Gdant F t G
)}({)}('{ t F Lt G L =
)(}0{)}({ s f Gt G sL =−⇔
)()}({ s f t G sL =⇔
s
s f t G L
)()}({ =⇔
s
s f duu F L
t )(
)(0
=
∫
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@on%o soal
@arila
=a0a; !
Misal
Maka
Sein22a menuru% sifa% %ransformasi di a%as
∫
t
du
u
u L
0
sin
t
t t F
sin)( =
st F L 1arctan)}({ =
s s s s f du
uu L
t
1arctan1)(sin
0
==
∫
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Transormasi Laplace Invers
Deinisii"a transor#asi $a%&ace sat nsi F (t )aa&ah f (s),
*ait +i"a #a"a F
(t ) iset sat transor#asi$a%&ace -ners ari f (s). Secara si#o&is it&is
iset o%erator transor#asi $a%&ace iners.)}({)( 1 s f Lt F −=
)()}({ s f t F L =
1− L
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@on%o#$ karena maka
'$ "arena
maka
t
e s L
2
2
1=
−
{ }2
121
−
=−
s
e L t
a
at
a s L
sinh122 =
−
22
1 1sinh
a sa
at L
−=
−
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.erdasarkan de8nisi di a%as4 dapa% di%en%ukan%ransformasi Laplace invers ;e;erapa fun2sisederana di;a0a ini$
/o. f(s)
1. 1
2. t
3.
4.
5.
.
)()}({1
t F x f L =−
s
1
2
1
s
,...3,2,1,0,1
1 =
+ n
sn
!n
t n
a s −
1 at e
22
1
a s + a
at sin
22 a s
s
+ at cos
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No$ f(s)
.
.
.
)()}({1 t F x f L =−
22
1
a s −
22 a s
s
−
222
22
)( a s
a s
+
−
a
at sinh
at cosh
at t cos
@ % l
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@on%o soalent"an transor#asi &a%&ace iners F (t) ari nsi
eri"t4
1)(
2−
=
s s f
t t ee s s
Lt F
s s s s f
s s s s s B
s s s s s A
s
B
s
A
s s s s f
s s s sQ s
s f
221
2
2
2
2
4
1
4
1
2
4
1
2
4
1
)(
2
4
1
2
4
1
4
1)(
4
1
)22(
1
2
1
)2)(2(
12)2(
41
)22(1
21
)2)(2(12)2(
22)2)(2(
1
4
1)(
)2)(2(4)(4
1)(
−− −=
−
−
+−
=
+
−+
−=
−=
−=−−
=−
=+−
→−=→+=
=+=+=+−→=→−=
++
−=
+−=
−=
+−=−=→−
=
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Teori konvolusiOperasi yang mendasar dalam pengolahan citra
adalah operasi konvolusi
Konvolusi 2 buah fungsi f (t) dan g (t) didefinisikansebagai berikut
y(t)= f(t) * g(t)= ∫ f(t) g (t-p)dp !alam hal ini" tanda # menyatakan operator
Konvolusi" dan peubah (variabel) p adalah peubahbantu
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6e&aran siste# enan tana%an i#%&s h(t) an#as"an x(t) a%at ieinisi"an seaai
7ta a%at +a in*ata"an∫
∞
∞−−= dp pt h p xt y )()()(
∫ ∞
∞−
−= dp pt x pht y )()()(
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8#s i atas i"ena& seaai intera& "ono&si. 9nt" 2nsi se#aran x(t) an h(t) #a"a intera& "ono&sir (t) a%at in*ata"an seaai
∫
∞
∞− −= dp pt h p xt r )()()(
)()()( t ht xt r ∗=
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Sifa% sifa% konvolusi"omu%a%if
/is%ri;u%if
)()(
)()()()(
t t
t xt yt yt x
r r yx xy =
∗=∗
[ ] [ ] [ ])()()(
)()()()()()()(
t t t
t z t xt yt xt z t yt x
r r r xz yx xy ±=∗±∗=±∗
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Asosia%if
@on%o!
.erapaka asil konvolusii :ika
[ ] [ ] )()()()()()( t z t yt xt z t yt x ∗∗=∗∗
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/imana persamaan konvolusi iala
Maka4
Sein22a4
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La%ian soal#$ Bi%un2la %ransformasi laplace dari
'$ Bi%un2la 4 :ika
-$ Bi%un2la %ransformasi laplace dariL5'? sin (C%)6
+$ Bi%un2la
C$ /en2an men22unakan sifa% %ransformasilaplace4 Ten%ukan %ransformasi laplacedari 2unakan sifa%
})1{( 22 +t L
( )t et F t 3sin)( 2−=
)():(; α α +=− s f t F e L t
):(; t F L 3,0,5
3,0{)( <
>= t
t t F
:4sin10; 2
t t L +
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,$ Ten%ukanla %ransformasi lapalce invers ! F (t)dari fun2si ;eriku% !
$ Ten%ukan ke%ika dan
D$ Ten%ukan ke%ika
)()( t ht g ∗ e t
t g 3
)( = e t
t h 2
)( =
)()( t ht g ∗
1)(
2 −++
= s
s s f
s
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ENELESAIAN NO$#
32
32
322
2
22
1
40
!2.4
1
40
)3(.444.10
:;4:4;sin10:4;:4sin10;:44sin10;
s s
s s
s s
t Lt L
t Lt Lt t L
++
=
+
+
=
++=
+=+=+
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ENELESAIAN NO$'
)1(5
5
5
.5.
.0..5.
)(
3
3
0
3
0
3
0
3
3
0
0
:
):(;
s
st
st
st
st st
st
e
s
e s
dt e
dt e
dt edt e
dt t F et F L
−
−
−
−
−∞
−
−∞
−=
−=
=
=
+=
∫ ∫
∫ ∫ ∫ =
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ENELESAIAN NO$-L5'? sin (C%)6 9 'L56 ? L5sin (C%)69 'L56 ? L56
9 ?9
9
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ENELESAIAN NO$ +
}12{})1{( 2422 ++=+ t t Lt L
}1{}2{}{ 24 Lt Lt L ++=
}1{}{2}{ 24 Lt Lt L ++=
s s s
1!22
!41214
+
+= ++
s s s
142435
++=
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ENELESAIAN NO$ C
134
3
)2(
3)2():3sin(;
3)(
3):3;sin(
)3sin()():3sin(;
2
2
2
2
2
2
++
=
++=+=
+
=
+=
=→
−
−
s s
s s f t e L
s
s f
st L
t t F t e L
t
t
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ENELESAIAN NO$ ,
( )
t t ee
s s Lt F
s s s s
s s f
s
s
s s
s s s B
s
s
s s
s s s A
s
B
s
A
s s
s
s s
s s f
s s s s sQ
s s
s s f
321
2
2
2
2
5
2
5
3
3
5
2
2
5
3
)(
3
5
2
2
5
3
1)(
5
2
)23(
13
2
1
)2)(2(
13)3(
5
3
)32(
12
3
1
)3)(2(
12)2(
32)3)(2(
1
1)(
)3)(2()(
1)(
−− +=
++
−=
++
−=
−+
+=
=−−+−=
−+=
+−+→−=→+=
=+
+=
+
+=
+−
+→=→−=
++
−=
+−
+=
−+
+=
+−=−+=→
−+
+=
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en7elesaian No$ #$
:adi persamaan konvolusi adala
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en7elesaian No$ D
/ike%aui
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