Analog and Digital Signals, Time and Frequency ...
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Analog and Digital Signals, Time and Frequency
Representation of Signals
Required reading: Garcia 3.1, 3.2
CSE 3213, Fall 2010 Instructor: N. Vlajic
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? Data vs. Signal ? Analog vs. Digital ? Analog Signals
Simple Analog Signals Composite Analog Signals
? Digital Signals
Data vs. Signal
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Data ? information formatted in human/machine readable form
? examples: voice, music, image, file
Signal ? electric or electromagnetic representation of data
? transmission media work by conducting energy along a physical path; thus, to be transmitted, data must be turned into energy in the form of electro-magnetic signals
Transmission ? communication of data through propagation and
processing of signals
Idea, Feeling, Knowledge
Data
Coding
Sender
Signal
Decoding Signal
Channel or Communication Medium
Data Receiver
Signal Representation
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Signal Representation ? typically in 2D space, as a function of
time, space or frequency
? when horizontal axis is time, graph displays the value of a signal at one particular point in space as a function of time
? when horizontal axis is space, graph displays the value of a signal at one particular point in time as a function of space
time
space
The time- and space- representation of a signal often resemble each other, though the signal envelope in the space-representation is different (signal attenuates over distance).
Signal Representation (cont.)
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Example [ signal in time and space ]
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