Artifact: Difference between revisions
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An '''artifact''' is a noticeable difference between an uncompressed signal and a [[lossy|lossily]]-compressed copy. | 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. | [[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''': | |||
Revision as of 18:44, 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
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