A FILTER which passes the entire frequency range except for a set of very narrow BANDs, spaced usually at equal distances (on either a linear or logarithmic scale). The roll-off at each of these frequencies is quite sharp, giving a diagram of the response of the filter the shape of a comb. A comb filter effect is found in PHASING (also called flanging) and in PINNA reflections.

Sound Example: A dynamically changing comb filter effect found in the environmental phasing of the sound of a seaplane taking off.