Filters are electrical circuits that are used to process signals.

• Why learn about filters?
• Filters process signals to remove or minimize noise, to shape signals, and to generate control signals.
• What should you know to learn about filters?
• You need to know about basic AC circuits.  Knowing how to use phasors to analyze AC circuits is helpful.
• Knowing something about time-constant system is helpful.  Here is a link relating time-constant systems to filters.
• What do you need to know about filters?
• You need to know about different types of filters.
• How do you use filters?
• You use filters to reduce or eliminate noise in signals.
• You use filters to reduce the effect of pulse noise in signals.
• What if you need more information?
• Problems
• Click here for Problems on Filters.

• A Single Time Constant Filter - Constant Input + Noise

        Here are some links to experiments you can do that will help you learn about signals.

• Introduction to Filters
• Filtering Noise in Sensor Signals