Parasound CD 1 CD player uses multiple readings to reduce errors

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margin-right: 9px;">HOME ENTERTAINMENT</a> </div>  <h1 id="ar_title">Parasound CD 1 CD player uses multiple readings to reduce errors</h1> <div class="summary_details_left"> <p>By <a href="/web/20130606230727/http://www.gizmag.com/author/david-szondy/" rel="author">David Szondy</a></p> <p><em>April 2, 2013</em></p> </div> <div class="summary_details_right"> <div class="has_comments"><a href="parasound-cd-1#comments">1 Comment</a></div> <div class="has_pictures"><a href="/web/20130606230727/http://www.gizmag.com/parasound-cd-1/26848/pictures">7 Pictures</a></div> </div> </div> <div id="article_share_rail"> <div class="as_button"><div class="fb-like" data-href="http://www.gizmag.com/parasound-cd-1/26848/" data-send="false" data-layout="box_count" data-show-faces="false"></div><script type="text/javascript">_ga.trackFacebook();</script></div> <div class="as_button"><a href="https://web.archive.org/web/20130606230727/http://twitter.com/share" class="twitter-share-button" data-count="vertical" data-via="gizmag">Tweet</a></div> <div class="as_button"><div class="g-plusone" data-size="tall" data-href="http://www.gizmag.com/parasound-cd-1/26848/"></div></div> <div class="as_button"><iframe style="overflow: hidden; margin: 0px; padding: 0px; border: 0px; " src="https://web.archive.org/web/20130606230727if_/http://badge.stumbleupon.com/badge/embed/5/?url=http%3A%2F%2Fwww.gizmag.com%2Fparasound-cd-1%2F26848%2F" width="50" height="60" id="iframe-stmblpn-widget-1"></iframe></div> <div class="as_button"><div class="pin-it-button" data-url="https://web.archive.org/web/20130606230727oe_/http://www.gizmag.com/parasound-cd-1/26848/" data-image="http://images.gizmag.com/hero/parasound-cd-1.jpg" data-description="The Parasound CD 1 player uses an ultra-fast scanning system and computer analysis to produce high-quality CD sound."></div></div> <div class="as_button"><script type="IN/Share" data-counter="top"></script></div> <div class="as_button" id="reddit_button_rail"><script type="text/javascript">reddit_newwindow='1'</script></div> <div class="as_button" id="email_a_friend_rail"><span class="email_a_friend">Email</span></div> </div> <div id="hero_box" style="width: 530px;"> <a id="hero_link" href="/web/20130606230727/http://www.gizmag.com/parasound-cd-1/26848/pictures"> <img src="https://web.archive.org/web/20130606230727im_/http://images.gizmag.com/hero/parasound-cd-1.jpg" title="The Parasound CD1 spins CDs four times faster than normal to eliminate errors" width="530" height="297" alt="The Parasound CD1 spins CDs four times faster than normal to eliminate errors"/></a> <div class="pic_caption"> <p>The Parasound CD1 spins CDs four times faster than normal to eliminate errors</p> <a href="/web/20130606230727/http://www.gizmag.com/parasound-cd-1/26848/pictures" id="gallery_link">Image Gallery</a> (7 images) </div> <div class="clear_both"></div> </div> <div class="article_body"> <div id="top_unit"></div> <script type="text/javascript"> </script> <script type="text/javascript" src="https://web.archive.org/web/20130606230727js_/http://pagead2.googlesyndication.com/pagead/show_ads.js"></script> <p>Audio files may seem to have put paid to CDs, but new technology shows that, like vinyl, the format still has a few tricks left up its sleeves. CDs do a pretty good job of reproducing music, but many an audiophile claims the digital format lacks “warmth” and often suffers from tiny, yet detectable, imperfections that can be as jarring as serving Gordon Ramsay ketchup with lobster. The Parasound CD 1 player strives to eliminate these imperfections by ditching the conventional CD player in favor of a CD-ROM drive that spins CDs at four times normal speed in order to find and eliminate imperfections before they reach the speakers.</p> <ul id="gallery_images"> <li><a href="/web/20130606230727/http://www.gizmag.com/parasound-cd-1/26848/pictures#1" class="image"><img src="https://web.archive.org/web/20130606230727im_/http://images.gizmag.com/gallery_tn/parasound-cd-1-1.jpg" title="The Parasound CD1 spins discs at four times normal speed" alt="The Parasound CD1 spins discs at four times normal speed"/></a></li> <li><a href="/web/20130606230727/http://www.gizmag.com/parasound-cd-1/26848/pictures#2" class="image"><img src="https://web.archive.org/web/20130606230727im_/http://images.gizmag.com/gallery_tn/parasound-cd-1-2.jpg" title="The Parasound CD1 uses proprietary software to reconcile errors" alt="The Parasound CD1 uses proprietary software to reconcile errors"/></a></li> <li><a href="/web/20130606230727/http://www.gizmag.com/parasound-cd-1/26848/pictures#3" class="image"><img src="https://web.archive.org/web/20130606230727im_/http://images.gizmag.com/gallery_tn/parasound-cd-1-3.jpg" title="The Parasound CD1 was developed in collaboration with Holm Acoustics in Denmark" alt="The Parasound CD1 was developed in collaboration with Holm Acoustics in Denmark"/></a></li> <li><a href="/web/20130606230727/http://www.gizmag.com/parasound-cd-1/26848/pictures#4" class="image"><img src="https://web.archive.org/web/20130606230727im_/http://images.gizmag.com/gallery_tn/parasound-cd-1-4.jpg" title="The Parasound CD1 has aluminium partitions to reduce noise" alt="The Parasound CD1 has aluminium partitions to reduce noise"/></a></li> <li id="view_all"><a href="/web/20130606230727/http://www.gizmag.com/parasound-cd-1/26848/pictures" class="blue">View all<br/></a></li> </ul> <div class="clear_both"></div> <p>To call how a conventional CD player works as “simple” would be more than misleading, but it is relatively straightforward. As the CD player scans a disc, it converts the digital coding into an audio signal more or less in real time. True, there are algorithms and coding to try to mitigate errors, but the player’s job is essentially to act as a decoding and conversion device. This arrangement worked well enough to allow CDs to put vinyl LPs on the same shelf as Edison wax cylinders, but it still lets many disc errors slip by to the amplifier.</p> <div style="width: 530px; height: 135px; " class="article_img"><a href="/web/20130606230727/http://www.gizmag.com/parasound-cd-1/26848/pictures#5" target="_blank"><img src="https://web.archive.org/web/20130606230727im_/http://images.gizmag.com/inline/parasound-cd-1-5.jpg" width="530" alt="The Parasound CD1 has cable outlets designed with noise reducion"/></a></div> <p>The Parasound CD 1, developed by <a href="https://web.archive.org/web/20130606230727/http://www.gizmag.com/parasound-halo-p7-dual-mode-pre-amp/9739/" target="_blank">Parasound</a> of San Francisco in collaboration with Holm Acoustics in Denmark, uses a CD-ROM drive instead of a conventional CD drive, which turns it into something of a digital timewarp. The CD-ROM drive is connected to a passively-cooled Intel ITX computer with a large memory buffer that allows the player to store 30 seconds of playback audio. This gives the computer time to analyze the disc scans for errors without interrupting playback.</p> <p>As the CD is spun four times faster than normal, the computer repeatedly scans the disc section by section, looking for errors by comparing each scan with a previous one. If no errors are detected, 30 seconds worth of audio data is dumped into the buffer and from there it goes on to the amplifier. If an error is detected and the player can’t resolve it before the buffer’s 30 seconds are up, it goes into “pre-interpolation analysis mode,” where the audio data is gone over one sample at a time until the bad fragment is found and isolated. According to Parasound, this always produces error-free data.</p> <div style="width: 530px; height: 436px; " class="article_img"><a href="/web/20130606230727/http://www.gizmag.com/parasound-cd-1/26848/pictures#4" target="_blank"><img src="https://web.archive.org/web/20130606230727im_/http://images.gizmag.com/inline/parasound-cd-1-4.jpg" width="530" alt="The Parasound CD1 has aluminium partitions to reduce noise"/></a></div> <p>This multiple scanning and analysis also helps to reduce the “jitter” caused by timing errors between the digital disc scanning and the analog audio output. As the confirmed data is sent the buffer, it is synchronized with the CD-ROM input clock. This is then sent out of the player through an asynchronous USB interface where the output is timed by a second ultra-precise clock. To avoid any inter-DAC delays, the CD 1 also uses a single AD1853 Digital to Audio Converter (DAC) in stereo mode instead of one for each audio channel.</p> <p>Not surprisingly, Parasound put a bit more into improving the sound quality than a new CD scanning system. There are three separate power supplies for analog and digital circuits, a six-layer DAC board for lower noise, proprietary software to ensure that the CD-ROM drive runs quietly, BNC digital cable outputs isolated by transformer couplings and massive aluminum partitions to isolate each function.</p> <p>What also isn’t surprising is that the Parasound CD 1 doesn’t come cheap at US$4,500.</p> <p>Source: <a href="https://web.archive.org/web/20130606230727/http://www.parasound.com/halo/cd1.php" target="_blank">Parasound</a> via <a href="https://web.archive.org/web/20130606230727/http://gizmodo.com/5992283/this-impeccably-accurate-cd-player-scans-your-disc-multiple-times-for-errors" target="_blank">Gizmodo</a></p>    <script type="text/javascript" src="https://web.archive.org/web/20130606230727js_/http://static.fmpub.net/zone/7980"></script> <div id="bottom_unit"> <script type="text/javascript"> </script> <script type="text/javascript" src="https://web.archive.org/web/20130606230727js_/http://pagead2.googlesyndication.com/pagead/show_ads.js"></script> </div> </div> <span class="title share_bar">Share</span> <div id="article_share_bar" class="dotsontop share_bar"> <div class="as_button fb_as_button"><div class="fb-like" data-href="http://www.gizmag.com/parasound-cd-1/26848/" data-send="false" data-layout="box_count" data-show-faces="false"></div><script type="text/javascript">_ga.trackFacebook();</script></div> <div class="as_button"><a href="https://web.archive.org/web/20130606230727/http://twitter.com/share" class="twitter-share-button" data-count="vertical" data-via="gizmag">Tweet</a></div> <div class="as_button"><div class="g-plusone" data-size="tall" data-href="http://www.gizmag.com/parasound-cd-1/26848/"></div></div> <div class="as_button"><iframe style="overflow: hidden; margin: 0px; padding: 0px; border: 0px; " src="https://web.archive.org/web/20130606230727if_/http://badge.stumbleupon.com/badge/embed/5/?url=http%3A%2F%2Fwww.gizmag.com%2Fparasound-cd-1%2F26848%2F" width="50" height="60" id="iframe-stmblpn-widget-2"></iframe></div> <div class="as_button"><div class="pin-it-button" data-url="https://web.archive.org/web/20130606230727oe_/http://www.gizmag.com/parasound-cd-1/26848/" data-image="http://images.gizmag.com/hero/parasound-cd-1.jpg" data-description="The Parasound CD 1 player uses an ultra-fast scanning system and computer analysis to produce high-quality CD sound."></div></div> <div class="as_button"><script type="IN/Share" data-counter="top"></script></div> <div class="as_button" id="reddit_button_bar"><script type="text/javascript">reddit_newwindow='1'</script></div>  </div>  <span class="title clear_left" id="author_byline_title">About the Author</span> <div class="dotsontop" id="authorcontainer">  <a href="/web/20130606230727/http://www.gizmag.com/author/david-szondy/"> <img src="https://web.archive.org/web/20130606230727im_/http://images.gizmag.com/author_profiles/153.jpg" alt="David Szondy" id="bio_pic"/> </a>   David Szondy is a freelance writer based in Monroe, Washington. An award-winning playwright, he has contributed to Charged and iQ magazine and is the author of the website <em>Tales of Future Past</em>.   <a href="/web/20130606230727/http://www.gizmag.com/author/david-szondy/">All articles by David Szondy</a> <span id="author_byline_links">   </span> <br class="clear_both"> </div>  <div id="tags"> <span class="title">Tags</span> <div class="dotsontop"> <ul> <li>» <a href="/web/20130606230727/http://www.gizmag.com/tag/audio/" rel="tag">Audio</a></li> <li>» <a href="/web/20130606230727/http://www.gizmag.com/tag/audiophile/" rel="tag">Audiophile</a></li> <li>» <a href="/web/20130606230727/http://www.gizmag.com/tag/cd-player/" rel="tag">CD Player</a></li> <li>» <a href="/web/20130606230727/http://www.gizmag.com/tag/computer/" rel="tag">Computer</a></li> </ul> <div class="clear_both"></div> </div> </div> <div id="bing_unit"></div>  <span class="title" id="comments">1 Comment</span> <div class="dotsontop"> <div id="comment-212218" class="a_comment"> <p>Wow. They re-invented oversampling. I'm... uh... surprised? Startled? Impressed is definitely NOT the word. </p> <p></p> <p>Seriously, folks. This idea has been around for like 15-20 years now. It has been in practical use (done differently, but still the exact same principle) for most of that time. </p> <p></p> <p>At least most of this idea. No, it did not use complex data analysis to smooth over "bumps" in the signal. It used far simpler techniques to arrive at a result that I would challenge anyone to be able to tell from this. </p> <p></p> <p></p> <span class="name">Anne Ominous</span><br> <span class="date"> 2nd April, 2013 @ 06:52 pm PDT</span> </div> </div> <span class="title">Post a Comment</span> <div class="dotsontop" id="comment_form_div"> <div id="comment_form" data-article="26848"> <div id="comments_login"> <form action="/web/20130606230727/http://www.gizmag.com/index.php" name="login_form" id="login_form" onsubmit="return false;"> <p class="bold">Login with your gizmag account:</p> <p id="login_status"></p> <label for="email">Email</label><input type="text" name="email" id="email" value=""/> <label for="password">Password</label><input type="password" name="password" id="password" value=""/> <input type="submit" value="Log In" class="med"/> <div id="options"> <a href="/web/20130606230727/http://www.gizmag.com/register/">Register here</a><br> <a 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