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<h3>Check/Compensate for CD Emphasis</h3> <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>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>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>Cdda2wav:</strong> <code>cdda2wav -J</code></p>
<p><strong>CD Paranoia:</strong> <code>cdparanoia -Q</code></p> <p><strong>CD Paranoia:</strong> <code>cdparanoia -Q</code></p>