In signal processing and related disciplines, aliasing refers to an effect that causes different signals to become indistinguishable (or aliases of one another) when sampled. It also refers to the distortion or artifact that results when the signal reconstructed from samples is different from the original continuous signal.

Contents

• 1 Description
• 2 Bandlimited functions
• 3 Bandpass signals
• 4 Sampling sinusoidal functions
  • 4.1 Folding
  • 4.2 Complex sinusoids
  • 4.3 Sample frequency
• 5 Historical usage
• 6 Angular aliasing
• 7 More examples
  • 7.1 Online "live" example
  • 7.2 Direction finding
• 8 Notes
• 9 See also
• 10 References
• 11 External links

Verb

aliasing

1. Present participle of alias.

Noun

aliasing (plural aliasings)

1. (signal processing, graphics, sound recording) Distortion caused by a low sampling rate, as Moire effect or stair-stepped edges.

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