Difference between revisions of "Artifact"

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m (Different kind of artifacts)
(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".  
 
* '''[[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
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''Illustrative sample'': [[http://www-ccrma.stanford.edu/~bosse/ castanets.wav]]
  
 
* '''ringing''':
 
* '''ringing''':

Revision as of 21:01, 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