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check for cd emph

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Andrew Weaver 2018-11-14 14:54:17 -08:00
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<!-- ends Rip with CDDA2WAV --> <!-- ends Rip with CDDA2WAV -->
<!-- Check for CD Emphasis -->
<label class="recipe" for="cd-emph-check">Check/Compensate for CD Emphasis</label>
<input type="checkbox" id="cd-emph-check">
<div class="hiding">
<h3>Check/Compensate for CD Emphasis</h3>
<p>While somewhat rare, certain CDs had 'emphasis' applied as a form of noise reduction. This seems to mostly affect early (1980s) era CDs and some CDs pressed in Japan. Emphasis is part of the <a href="https://en.wikipedia.org/wiki/Compact_Disc_Digital_Audio#Standard">Red Book standard</a> and, if present, must be compensated for to ensure accurate playback. CDs that use emphasis contain flags on tracks that tell the CD player to de-emphasize the audio on playback. When ripping a CD with emphasis, it is important to take this into account and either apply de-emphasis while ripping, or if storing a 'flat' copy, create another de-emphasized listening copy.</p>
<p>The following commands will output information about the presence of emphasis when run on a target CD:</p>
<p><strong>Cdda2wav:</strong> <code>cdda2wav -J</code></p>
<p><strong>CD Paranoia:</strong> <code>cdparanoia -Q</code></p>
<p>In order to compensate for emphasis during ripping while using Cdda2wav, the <code>-T</code> flag can be added to the <a href="#cdda2wav">standard ripping command</a>. For a recipe to compensate for a flat rip, see the section on <a href="#cd_eq">de-emphasizing with FFmpeg</a>.
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<!-- Check for CD Emphasis -->
</div> </div>
<!-- ends CDDA Tools --> <!-- ends CDDA Tools -->