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A signal is a function that maps an independent variable into a dependent variable. The function f(x), for each value of x,produces the value f(x)

There are four ways to classify signals according to the values that theindependent and dependent variables can take. Refer to the table below.

Quick aside on signal notation

Continuous Time signals are represented as f t where t . Discrete Time signals are represented as f n where n

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Source:  OpenStax, Signals, systems, and transforms (under construction). OpenStax CNX. Aug 24, 2003 Download for free at http://cnx.org/content/col10207/1.4
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