Revision as of 07:46, 11 September 2008 by Nkgentry (Talk)

TIME INVARIANCE

A system is defined as "time invariant" when its output is not an explicit function of time.  
To figure out whether a system is time invairant, we need to look for a value t outside of the
normal x(t) or y(t).  If it does not contain such a value t outside of the x(t), then it is time
invariant.  For instance, consider the following systems:

SYSTEMS:
A.) h1(t) = 2x1(3t) + 5
B.) h2(t) = 6t*x2(3t) + 5

System A does not contain a "t" outside of the x1(3t).  Therefore, we can call it time invariant.
However, system B does contain a "t" outside of the x2(3t).  Thus, system B is not time invariant.


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