Lesson 01: Introduction to
Digital Signal Processing (DSP)
What’s it all about?
Origins of DSP
Signal and System domains
– Continuoustime
– Discretetime
Digital
g
DSP advantages and disadvantages
Motivational examples
No Challenge Problem
Introduction to MATLAB Project 1
Lesson 01
A Cons ltation Times
TA Consultation Times
11 am  12:00 pm, Monday.
Location: Building RLA, Room 404A. (Reed lab)
g,
(
)
11 am  12:00 pm, Thursday.
Location: Building NEB, Room 436
:30pm 
:30 pm Thursday
1:30pm 2:30 pm, Thursday.
Location: Building NEB, Room 436
lso posted on course home page
Also posted on course home page
Lesson 01
rigins of DSP
Origins of DSP
i it l
i2
5
W
h
h
i
lt
i
ld
– Predigital
– Amazing 25 W humans, mechanical, optical, and
analog systems
emember man was put on the moon by an analog slide rule
(remember, man was put on the moon by an analog slide rule,
not a digital computer).
Transitional
 Claude Shannon and Harry Nyquist. (1928/1949)
yy
q
(
)
– DSP
dawn – ColleyTukey FFT
(1965)
– DSP
era – Intel 2920
(1980)
Lesson 01
rigins of DSP
Origins of DSP
tel 2920
Intel 2920
Analog
Signal
Processor
Analog???
Lesson 01
rigins of DSP
Origins of DSP
Lesson 01
ignal Domains
Signal Domains
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•

2 D
•M

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Lena
Lesson 01
Signal Domains
Continuoustime signals
Infinite resolution in time and amplitude
x(t)
Continuoustime causal system (output follows input)
y(
p
p
)
Continuoustime noncausal system (prophetic)
Is x(t) = cos(
0
t) a causal on noncausal signal?
Lesson 01
Signal Domains
Discretetime
Infinite resolution in amplitude
Discrete resolution in time
Requires an ideal sampler.
xamples: Sample data control systems economic systems biological
Examples: Sample data control systems, economic systems, biological
models, …
f
s
Sample
and
Hold
x
(
t
)
x
[
k
]
.
Circuit
Continuoustime to discrettime conversion.
Lesson 01
Signal Domains
Discretetime signal example:
Dow Jones Average
Note: Digital signal if quantized to the penny.
Lesson 01
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View Full Documentignal Domains
Signal Domains
Digital Signals
–
Discrete resolution in both amplitude and time
Requires an ADC
f
s
Sample
and
Hold
x
(
t
)
x
[
k
]
ADC
.
Circuit
Quantizer
ontinuous me to discret me conversion
Continuous time to discret time conversion.
Lesson 01
ignal Domains
Signal Domains
Continuoustime
(analog) signal x(t)
ampled
Discrete
me signal
Signal
uantize
Taxonomy
Quantized
Q
(digital)
signal x
Q
[k]
Q
Lesson 01
lementar Signals
Elementary Signals
Examples of
MATLAB
constructs supplied discretetime signals:
–I
m
p
u
l
s
e
–
Step function
f
t
i
–
Ramp function
–
Exponential (real and complex)
Lesson 01
lementar Signals
Elementary Signals
•
Sinusoidal (damped and
undamped)
•
Random (uniform and normal)
•
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 Fall '11
 janisemcnair
 Digital Signal Processing, Computer Networks, Signal Processing

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