Difference between revisions of "Artifact"

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An '''artifact''' is a noticeable difference between an uncompressed signal and a [[lossy|lossily]]-compressed copy.
 
An '''artifact''' is a noticeable difference between an uncompressed signal and a [[lossy|lossily]]-compressed copy.
 
[[Lossy]] encoding can result in very different kind of artifacts/distortions. Sometimes it's not easy to define why the encoding is non-transparent. There are however many typical encoding artifacts.
 
[[Lossy]] encoding can result in very different kind of artifacts/distortions. Sometimes it's not easy to define why the encoding is non-transparent. There are however many typical encoding artifacts.
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===Different kind of artifacts===
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* '''pre-echo''': pre-echo consists in a small amount of noise used to appear just before a contrasted sound events (like percussive instruments). The original transients are therefore smeared: "___shhhTak" instead of "____Tak".
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''Illustrative sample'': castanets.wav
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* '''ringing''':
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* '''warbling''':
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* '''coarseness''':
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* '''stereo collapse''':
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Revision as of 18:44, 10 June 2006

An artifact is a noticeable difference between an uncompressed signal and a lossily-compressed copy. Lossy encoding can result in very different kind of artifacts/distortions. Sometimes it's not easy to define why the encoding is non-transparent. There are however many typical encoding artifacts.


Different kind of artifacts

  • pre-echo: pre-echo consists in a small amount of noise used to appear just before a contrasted sound events (like percussive instruments). The original transients are therefore smeared: "___shhhTak" instead of "____Tak".

Illustrative sample: castanets.wav

  • ringing:
  • warbling:
  • coarseness:
  • stereo collapse:


External links