Artifact

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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.


Common artifacts[edit]

  • 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 samples: castanets.wav, castanets2.wav
The phenomenon could sometimes be visualised on a frequency editor:
Preecho.png
To listen to the corresponding artifact, click here


  • ringing:


  • warbling:


  • coarseness:


  • stereo collapse:


External links[edit]

  • ff123's Audio Artifact Training Page


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