Comb filter

In <a href="/facts/Signal_processing/Npaja6zb">signal processing</a>, a comb filter is a <a href="/facts/Filter_(signal_processing)/vydJCNle">filter</a> implemented by adding a delayed version of a <a href="/facts/Signal_processing/Npaja6zb">signal</a> to itself, causing constructive and destructive <a href="/facts/Interference_(wave_propagation)/lI5f78I4">interference</a>. The <a href="/facts/Frequency_response/zsHmnCJ4">frequency response</a> of a comb filter consists of a series of regularly spaced notches in between regularly spaced peaks (sometimes called teeth) giving the appearance of a <a href="/facts/Comb/lIutLoTP">comb</a>.
Comb filters exist in two forms, feedforward and <a href="/facts/Feedback/XnuWH3zp">feedback</a>; which refer to the direction in which signals are delayed before they are added to the input.
Comb filters may be implemented in <a href="/facts/Discrete_time/RR8wpS9e">discrete time</a> or <a href="/facts/Continuous_time/RR8wpS9e">continuous time</a> forms which are very similar.

Comb filter open-in-new

Comb filter