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Lecture 2

# Lecture 2 - Signals and Systems EE314 Lecture 2 Review of...

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1/6/2010 1 EE314: Lecture 2 Review of Signals Signals and Systems A signal is a set of information or data, and mathematically represented by a function of time. A system is a combination of devices and networks to perform a desired operation on signals. Signal Classification Energy signal vs. Power signal Continuous-time signal vs. Discrete-time signal Analog signal vs. Digital signal Periodic vs. Aperiodic signal Deterministic signal vs. Random signal Engergy and Power Signal Energy Energy signal: if E g <∞. Signal Power Power signal : if P g <∞. Examples Sometimes uses dBW, dBmW to represent signal power when it is very small or large. (J) | ) ( | 2 dt t g E g (W) | ) ( | 1 lim 2 2 2 T T T g dt t g T P t t g t t t g e t g t 7 ) ( ) 6 / 5 cos( 4 ) 3 sin( 2 1 ) ( ) ( 3 2 1

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1/6/2010 2 Energy and Power Signals Figure 2.1 Examples of signals: (a) signal with finite energy; (b) signal with finite power.
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Lecture 2 - Signals and Systems EE314 Lecture 2 Review of...

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