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