Artifact: Difference between revisions
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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 samples'': [[http://www-ccrma.stanford.edu/~bosse/ castanets.wav]], [[http://anonymousriver.hp.infoseek.co.jp/castanets2/index.html castanets2.wav]] | ''Illustrative samples'': [[http://www-ccrma.stanford.edu/~bosse/ castanets.wav]], [[http://anonymousriver.hp.infoseek.co.jp/castanets2/index.html castanets2.wav]] | ||
The phenomenon could sometimes be visualised on a frequency editor: | |||
[[Image:Preecho.png]] | |||
To listen to the corresponding artifact, click [[http://audiotests.free.fr/tests/wiki/castanets2.mp3 here]] | |||
* '''ringing''': | * '''ringing''': | ||
Revision as of 21:42, 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 samples: [castanets.wav], [castanets2.wav]
The phenomenon could sometimes be visualised on a frequency editor:
To listen to the corresponding artifact, click [here]
- ringing:
- warbling:
- coarseness:
- stereo collapse:
External links
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