Filtering Noise (Part I)

August 25, 2009

If you own a car, you probably noticed that the speedometer needle’s position varies but relatively slowly, regardless of how the car actually accelerates or decelerates. Unless your speedometer is some variation on the eddy current meter, maybe the noise from the speed sensor isn’t filtered analogically but numerically by the dashboard’s computer.

Ford_Mondeo_MK3_ST220_-_Speedometer_(light)

Let us have a look at how this filtering could be done.

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