Table of Fourier Transform Properties
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Fourier Transform Properties
Property (contributor)
Expanation
Convolution (
Ben Henry
)
If
h
(
x
)
=
(
f
∗
g
)
(
x
)
{\displaystyle h(x)=\left(f*g\right)(x)}
, becomes
h
^
(
ξ
)
=
f
^
(
ξ
)
⋅
g
^
(
ξ
)
.
{\displaystyle {\hat {h}}(\xi )={\hat {f}}(\xi )\cdot {\hat {g}}(\xi ).}
Scaling (
Chris Lau
)
Given
a
, which is non-zero and real, and
h
(
x
)
=
f
(
a
x
)
{\displaystyle \ h(x)=f(ax)}
, then
h
^
(
ξ
)
=
1
|
a
|
f
^
(
ξ
a
)
{\displaystyle {\hat {h}}(\xi )={\frac {1}{|a|}}{\hat {f}}\left({\frac {\xi }{a}}\right)}
. If
a
=−1, then the time-reversal property states: if
h
(
x
)
=
f
(
−
x
)
{\displaystyle \ h(x)=f(-x)}
, then
h
^
(
ξ
)
=
f
^
(
−
ξ
)
{\displaystyle {\hat {h}}(\xi )={\hat {f}}(-\xi )}
.
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