Used in the context of processing digitized signals (e.g. audio) and images (e.g. video), aliasing describes the effect of undersampling during digitization which can generate a false (apparent) low frequency for signals, or staircase steps along edges in images (jaggies.) Aliasing can be avoided by an antialiasing (analogue) low-pass filter, before sampling. The term antialiasing is also in use for a posteriori signal smoothing intended to remove the effect.


  • Based on content from The Data Analysis Briefbook (

Title aliasing
Canonical name Aliasing
Date of creation 2013-03-22 12:04:23
Last modified on 2013-03-22 12:04:23
Owner akrowne (2)
Last modified by akrowne (2)
Numerical id 8
Author akrowne (2)
Entry type Definition
Classification msc 68U10
Classification msc 94A08