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EE 113: Digital Signal Processing
Week 2
1. Discrete-time systems
- definitions about systems and their characterizations
2. Impulse response sequence

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2
Discrete-time systems
A
system
converts input to output:
What makes a system special is that the
input sequence x[n] must
uniquely
define the output signal y[n]
x
[
n
]
DT System
y
[
n
]
y
[
n
] =
S
(
x
[
n
])

3
Discrete-time systems
Is the following a system?
y
2
[
n
] =
|x
[
n
]|

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