Comb Filter Implementation

  Comb Filter   A comb filter is a signal processing filter that creates constructive and destructive interference by adding a delayed version of a signal to itself. A comb filter’s frequency response is made up of a series of evenly spaced notches that resemble a comb.   Phase Interference Understanding the principles of phase interference helps understand why comb filtering occurs.  Constructive Interference Take a glance at the sound waves below. The frequencies of the waves are identical. They're also in phase, which means the waves rise and fall in unison. They add together and generate a sound wave that is double the original size since they are in phase and have the same amplitude. It's like adding 2 numbers. This phenomenon is known as constructive phase interference. Destructive Interference The sound waves in this image are completely out of phase. This means that when one waveform rises, the other falls. Because the waves are the same size and perfectly out o