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A Filter object manages a single filter on a controller.
It represents the control algorithm used to control a motor in a
closed-loop system. The Filter contains an algorithm, a set of coefficients,
inputs, and an output. Its primary responsibility is to take the
difference between the command and actual positions and then calculate
the output based on the control algorithm and coefficients.
For simple systems, there is a one-to-one relationship between
the Axis, Filter, and Motor objects.
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