A phaser is an electronic sound processor used to filter a
signal by creating a series of peaks and troughs in the
frequency spectrum. The position of the peaks and troughs is
typically modulated so that they vary over time, creating a
sweeping effect. For this purpose, phasers usually include a
low-frequency oscillator. A short, unprocessed string sample,
followed by a few different phasing effects on the same sample
|Problems listening to this file? See media help.| The
electronic phasing effect is created by splitting an audio
signal into two paths. One path treats the signal with an all-
pass filter, which preserves the amplitude of the original
signal and alters the phase. The amount of change in phase
depends on the frequency. When signals from the two paths are
mixed, the frequencies that are out of phase will cancel each
other out, creating the phaser's characteristic notches.
Changing the mix ratio changes the depth of the notches; the
deepest notches occur when the mix ratio is 50%. The definition
of