8-bit microcontroller implements digital lowpass filter

摘要

Filtering occurs frequently in the analog world. Unfortunately, in the digital world, engineers apply it mainly to the DSPs (digital-signal processors) and not to the small 8-bit microcontrollers that designers commonly use. This situation occurs because the math for the filter design is more complicated than most engineers are willing to deal with. Moreover, digital filtering requires calculations on integers instead of on floating-point numbers.