Flanger Speed and Excursion

As mentioned above, the delay-line length in a digital flanger is typically modulated by a low-frequency oscillator (LFO). The oscillator waveform is usually triangular, sinusoidal, or exponential (triangular on a log-frequency scale). In the sinusoidal case, we have the following delay variation:

where is the ``speed'' (or ``rate'') of the flanger in cycles per second, is the ``excursion'' or ``sweep'' (maximum delay swing) which is often not brought out as a user-controllable parameter, and is the average delay length controlling the average notch density (also not normally brought out as a user-controllable parameter).

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written by Julius Orion Smith III
Julius Smith's background is in electrical engineering (BS Rice 1975, PhD Stanford 1983). He is presently Professor of Music and Associate Professor (by courtesy) of Electrical Engineering at Stanford's Center for Computer Research in Music and Acoustics (CCRMA), teaching courses and pursuing research related to signal processing applied to music and audio systems. See http://ccrma.stanford.edu/~jos/ for details.