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<p>My control system gets a signal representing the plant output, but that
signal has a lot of noise on it.  The control system goes nuts trying to
react to the noise.  I need to filter out the noise somehow, but preserve
the basic plant response.  I heard about a moving average and tried it.
It helps, but uses up a lot of memory in my small microcontroller.  It
also introduces some lag.

<p>Is there a way to get rid of the noise, use less memory, and maybe have
less lag too?