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The unit step function is defined as

u ( t ) = 1 , t 0 0 , t < 0

This function is useful for defining signals which we wish to start at t = 0 . In other words, often, we would like for signals to be zero for negative values of t . We can force this situation by simply multiplying by u ( t ) .

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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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