https://wiki.hydrogenaudio.org/api.php?action=feedcontributions&feedformat=atom&user=209.213.232.152 2026-05-04T19:59:43Z User contributions MediaWiki 1.44.2 https://wiki.hydrogenaudio.org/index.php?title=Artifact&diff=25490 2013-09-13T06:26:17Z

<p>209.213.232.152: /* External links */</p> <hr /> <div>An '''artifact''' is a noticeable difference between an uncompressed signal and a [[lossy|lossily]]-compressed copy.<br /> [[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.<br /> <br /> <br /> ===Common artifacts===<br /> <br /> * '''[[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: &quot;___shhhTak&quot; instead of &quot;____Tak&quot;. <br /> <br /> :''Illustrative samples'': [http://www-ccrma.stanford.edu/~bosse/ castanets.wav], [http://anonymousriver.hp.infoseek.co.jp/castanets2/index.html castanets2.wav]<br /> <br /> :The phenomenon could sometimes be visualised on a frequency editor:<br /> :[[Image:Preecho.png]]<br /> <br /> :''To listen to the corresponding artifact, click [http://audiotests.free.fr/tests/wiki/castanets2.mp3 here]''<br /> <br /> <br /> * '''ringing''':<br /> <br /> <br /> * '''warbling''': <br /> <br /> <br /> * '''coarseness''':<br /> <br /> <br /> * '''stereo collapse''':<br /> <br /> <br /> ===External links===<br /> *&lt;s&gt;ff123's Audio Artifact Training Page&lt;/s&gt;<br /> <br /> <br /> {{stub}}<br /> <br /> <br /> [[Category:Listening Tests]]</div>

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