Oct 21 2009
While I was working toward my electrical engineering degree, I studied control theory. Control theory deals with influencing the behavior of dynamic systems.
The desired output of a system is called the reference. When one or more output variables of a system need to follow a certain reference over time, a controller manipulates the inputs to a system to obtain the desired effect on the output of the system. The figure below illustrates the basic components of a control system (definition from Wikipedia).
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