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Hoán Chuyển Fourier
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From Wikiversity
Hoán Chuyển Fourier , chuyển hệ từ hệ thời gian thực sang hệ số ảo
f
(
t
)
−
>
F
(
j
ω
)
{\displaystyle f(t)->F(j\omega )}
.
L
{
f
(
t
)
}
=
F
(
s
)
=
∫
0
−
∞
f
(
t
)
e
−
j
ω
t
d
t
{\displaystyle {\mathcal {L}}\{f(t)\}=F(s)=\int \limits _{0^{-}}^{\infty }f(t)e^{-j\omega t}dt}
Thí dụ
f
(
x
)
{\displaystyle f(x)}
d
d
t
{\displaystyle {\frac {d}{dt}}}
∫
d
x
{\displaystyle \int dx}
F
(
j
ω
)
=
∫
f
(
x
)
e
j
ω
x
d
x
{\displaystyle F(j\omega )=\int f(x)e^{j\omega x}dx}
j
ω
{\displaystyle j\omega }
1
j
ω
{\displaystyle {\frac {1}{j\omega }}}
Luật hoán chuyển Fourier
Công thức hoán chuyển fourier
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