In
signal processing, a comb filter adds a delayed version of a
signal to itself, causing constructive and destructive interference. The
frequency response of a comb filter consists of a series of regularly-spaced spikes, giving the appearance of a
comb.Comb filters exists in two different forms,
feedforward and
feedback; the names refer to the direction in which signals are delayed before they are added to the input.Comb filters may be implemented in
discrete time or
continuous time; this article will focus on discrete-time implementations; the properties of the continuous-time comb filter are very similar.
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