Difference between revisions of "Artifact"
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| − | An '''artifact''' is a noticeable difference between an | + | 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. | ||
| − | == | + | |
| − | *[http:// | + | ===Common 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 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]'' | ||
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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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| + | ===External links=== | ||
| + | *<s>ff123's Audio Artifact Training Page</s> | ||
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| + | {{stub}} | ||
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| + | [[Category:Listening Tests]] | ||
Latest revision as of 06:26, 13 September 2013
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
ff123's Audio Artifact Training Page
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