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Analog Signals

The term ``analog'' refers to the fact that a signal is ``analogous'' of the signal it represents.

Figure 1: An analog electrical signal represents the pressure variations of a sound wave.
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Microphone and speaker's are analog devices because they record and play an exact analog of sound:

Analog signals are continuous in time.

A continuous signal cannot be stored, or processed, in a computer since it would require an infinite amount of data.

Analog signals must therefore be discretized, or digitized, to produce a a finite set of numbers, for computer use.


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``CMPT 165: Review'' by Tamara Smyth, Computing Science, Simon Fraser University.
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Copyright © 2011-12-05 by Tamara Smyth.
Please email errata, comments, and suggestions to Tamara Smyth<tamaras@cs.sfu.ca>
School of Computing Science,   Simon Fraser University