### 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).

Next Section:
Flanger Depth Control
Previous Section:
Summary of Windowed Sinc Interpolation