Digital Signal Processing Reference
In-Depth Information
1
(a)
0.5
0
0
1
2
3
4
5
6
7
8
9
10
1
n
(b
)
0.5
0
0
1
2
3
4
5
6
7
8
9
10
1
n
(c
)
0.5
0
0
1
2
3
4
5
6
7
8
9
10
1
n
(d)
0
-1
1
2
3
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5
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7
8
9
10
11
n
FIGURE 1.5
Examples of common discrete-time signals. (a) Unit impulse sequence x(n) =
(n-2), (b) Unit
step sequence x(n) = u(n), (c) Exponential signal x(n) = 0.8
n
u(n), (d) Sinusoidal sequence x(n) =
cos(
δ
π
n/4).
Likewise, systems that operate on discrete-time signals are termed
discrete-
time systems.
One important class of these systems is called a
linear time
invariant
(
LTI
) system. We will discuss discrete-time LTI systems in detail in
Chapter 2
.
1.2
Problem Solving
Exercise 1: Solve the following problems, briefly outlining the important
steps:
a.
DSP primarily deals with commonly occurring signals such as
speech, music, video, EKG (heart), and EEE (brain). Research the
Internet to get information on the approximate frequency ranges of
the five signals listed above.
