Flanging

ألاسمشَفَة ; شَفْر ; شُفْر ; شَفِير ; طَرْف
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An effect in which a delayed signal is varied between 0 and 20 milliseconds of delay and combined with the original signal. The resulting swishing, hollow sound is reminiscent of a jet passing overhead. Usually a variable comb filter is used to produce the flanging effect.