1
Lecture 2: Discrete-Time Systems and
z
-Transform
•
Discrete-time signals v.s. continuous-time signals
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Discrete-time systems v.s. continuous-time systems
•
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-Transform
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Inverse
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-Transform
•
z
-Transform for solving linear difference equations
Continuous-Time Signals
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A signal that changes continuously in time:
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Defined at all times
t
(no gap)
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Signal can take arbitrary values
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Example: temperature, position, velocity,…
e
(
t
)
;
¡1
< t <
1
;
or
t
¸
0
e
(
t
)
t

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