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Periodic signals have the following property:

x ( t ) = x ( t + k T )

where k is an integer and T is called the fundamental period . Periodic have the property that they “repeat" every T seconds. For periodic signals, the power can be defined as

p x = 1 T t 0 t 0 + T x 2 ( t ) d t

[link] shows an example of a periodic signal. We will study the frequency content of periodic signals in some detail in Chapter 2.

General periodic signal.

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Source:  OpenStax, Signals, systems, and society. OpenStax CNX. Oct 07, 2012 Download for free at http://cnx.org/content/col10965/1.15
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