Input anti-aliasing filters eliminate rogue frequencies that cause aliasing.

Within a digital world, the parameters of real-world information (temperature, voltage, current, speed, flow, pressure, distance, etc.) used for process communications and control are analog in nature. Processing this information is achieved primarily using digital signal processing techniques. The age of microelectronics has made it possible for digital processing power to be extended into the field where sensors are located; thus, much preprocessing can be accomplished outside the main computer or PC.