Demystifying Digital Filters, Part 1
(Image from https://docs.cycling74.com/max8/tutorials/08_filterchapter01)
Source: The Scientist and Engineer's Guide to Digital Signal Processing, copyright ©1997-1998 by Steven W. Smith. For more information visit the book's website at: www.DSPguide.com
(Image: https://en.wikipedia.org/wiki/Digital_biquad_filter)