{"id":1720,"date":"2008-03-16T13:13:18","date_gmt":"2008-03-16T11:13:18","guid":{"rendered":"http:\/\/www.randform.org\/blog\/?p=1720"},"modified":"2008-03-16T13:13:18","modified_gmt":"2008-03-16T11:13:18","slug":"it-seems-theyve-done-it","status":"publish","type":"post","link":"https:\/\/www.randform.org\/blog\/?p=1720","title":{"rendered":"it seems they&#8217;ve done it"},"content":{"rendered":"<p>In theory it should be impossible to separate the notes in a chord. If you play a sine wave and add say a perfect 5th one perceives this either as a single note (now with a different timbre than the single sine wave) or as an interval &#8211; namely the perfect 5th. what one hears depends on several things. If for example both sine waves are given a slight vibrato of the same phase and rate one is more likely to hear this a one note. However in general it should be impossible to tell (algorithmically) whether the audiosignal is a chord or a timbre. Theoretically. In practice chords are allmost never tuned perfectly, the notes in a chord are likely to start with tiny (or even big) offsets, the instruments \/ strings \/ sources usually have their own characteristics. So it might be possible in practice to separate the notes in a chord. Still it should be a difficult task.<br \/>\nNow <a href=\"http:\/\/www.celemony.com\/\">celemony<\/a> &#8211; the company that makes the incredible Melodyne &#8211; anounced that they have takled the problem.<br \/>\nHere is <a href=\"http:\/\/www.celemony.com\/cms\/index.php?id=dna&#038;L=1\">a promo video<\/a> that shows the possibilities (they use the slightly overused DNA acronym for their technology (this time as &#8220;direct note access&#8221;)) .<br \/>\nImpressive and somewhat scary.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In theory it should be impossible to separate the notes in a chord. If you play a sine wave and add say a perfect 5th one perceives this either as a single note (now with a different timbre than the single sine wave) or as an interval &#8211; namely the perfect 5th. what one hears [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[18,6],"tags":[],"_links":{"self":[{"href":"https:\/\/www.randform.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1720"}],"collection":[{"href":"https:\/\/www.randform.org\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.randform.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.randform.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.randform.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1720"}],"version-history":[{"count":0,"href":"https:\/\/www.randform.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1720\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.randform.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1720"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.randform.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1720"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.randform.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}