Artifact: Difference between revisions
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===Common 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'': [http://www-ccrma.stanford.edu/~bosse/ castanets.wav], [http://anonymousriver.hp.infoseek.co.jp/castanets2/index.html castanets2.wav] | |||
''Illustrative samples'': | |||
The phenomenon could sometimes be visualised on a frequency editor: | :The phenomenon could sometimes be visualised on a frequency editor: | ||
[[Image:Preecho.png]] | :[[Image:Preecho.png]] | ||
To listen to the corresponding artifact, click | :''To listen to the corresponding artifact, click [http://audiotests.free.fr/tests/wiki/castanets2.mp3 here]'' | ||
* '''ringing''': | * '''ringing''': | ||
* '''warbling''': | * '''warbling''': | ||
* '''coarseness''': | * '''coarseness''': | ||
* '''stereo collapse''': | * '''stereo collapse''': | ||
===External links=== | ===External links=== | ||
Revision as of 19:24, 12 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.
Common 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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