<div dir="ltr">Hi Atte,<br><br>if you already mentioned Massenburg, <br>he makes some high quality (and high price tag) analog devices mostly used by mastering engineers. <br>He "should" know his stuff.<br><br>It happens to be that just today I came across this vid of Bob Katz (a well known mastering engineer), <br>
he uses the mp3 artifacts too but with a different purpose.<br><br><a href="http://www.youtube.com/watch?v=8EgamkLkXW8&feature=related">http://www.youtube.com/watch?v=8EgamkLkXW8&feature=related</a><br><br>Hope you find it interesting.<br>
Moshe<br><br><br><br><br><div class="gmail_quote">On Tue, Oct 11, 2011 at 11:42 PM, Atte André Jensen <span dir="ltr"><<a href="mailto:atte@email.dk">atte@email.dk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im">On 10/11/2011 11:36 PM, Fons Adriaensen wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
There are at least two good reasons why such a test is<br>
not valid.<br>
<br>
1. The difference signal doesn't tell you anything about<br>
audible differences between two signals. It's fairly easy<br>
to make a linear filter (no compression involved) with<br>
a perfectly flat response and that nobody would be able<br>
to hear. But when you take the difference between in and<br>
out it is 3 dB higher than both.<br>
<br>
2. Lossy compression is based on combined temporal and<br>
spectral masking - some signals you can't hear in the<br>
presence of others. Of course when you take away the<br>
masking signal they become apparent...<br>
</blockquote>
<br></div>
Makes a lot of sense, thanks!<br>
<br>
BTW: Apparently the guy in the link has lifted the idea from this clip:<br>
<br>
<a href="http://www.youtube.com/watch?v=wzJbjHc6bRE" target="_blank">http://www.youtube.com/watch?<u></u>v=wzJbjHc6bRE</a><br>
<br>
where George Massenburg does the same. I don't know George Massenburg, but he supposedly is some kine of authority in the world of audio engineering. Not that it makes the test more valid...<div class="im"><br>
<br>
-- <br>
Atte<br>
<br>
<a href="http://atte.dk" target="_blank">http://atte.dk</a> <a href="http://modlys.dk" target="_blank">http://modlys.dk</a><br></div><div><div></div><div class="h5">
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