Digital Signal Processing Reference
In-Depth Information
(
a
)
⎮
X
a
(
j
w
)
⎮
0
(
b
)
Figure 3.1
An analog signal
x
a
(t)
and the magnitude of its Fourier transform
X(jω)
.
x
a
(
nT
)
n
0
(
a
)
⏐
X
(
e
j
w
)
⏐
X
(
j
w
)
T
X
(
j
(
w
−
w
s
))
T
X
(
j
(
w
−
2
w
s
))
T
0
(
b
)
w
s
2
w
s
Figure 3.2
The discrete-time signal
x
a
(nT )
obtained from the analog signal
x
a
(t)
and
the discrete-time Fourier transform
H(e
jω
)
.
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