Audio Effects
Objectives
To understand and identify various audio
processing effects
Reverberation
A reverberation, or reverb, is created when a sound
is produced in an enclosed space causing a large
number of echoes to build up and then slowly
decay as the sound is absorbed by the walls and air.
Delay
Delay is an audio effect which records an input
signal to an audio storage medium, and then
plays it back after a period of time. The delayed
signal may either be played back multiple times,
or played back into the recording again, to
create the sound of a repeating, decaying echo.
Phaser
A phaser is an audio signal processing technique
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.
Flanging
Flanging is an audio effect produced by mixing
two identical signals together, with one signal
delayed by a small and gradually changing
period, usually smaller than 20 milliseconds.
This produces a swept comb filter effect.
Chorus
A chorus effect occurs when individual sounds
with roughly the same timbre and nearly (but
never exactly) the same pitch converge and are
perceived as one. While similar sounds coming
from multiple sources can occur naturally (as in
the case of a choir or string orchestra), it can
also be simulated using an electronic effects unit
or signal processing device.