haryy
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#1
14th August 2009
Old 14th August 2009
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Converter THD+n.

What is its scale?
If 1 channel produces -108db, then what happens when you add 50 tracks?
Is it a 3db per doubling?
#2
14th August 2009
Old 14th August 2009
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Teddy Ray's Avatar
 

Quote:
Originally Posted by haryy View Post
What is its scale?
If 1 channel produces -108db, then what happens when you add 50 tracks?
Is it a 3db per doubling?
Stacking Theory
#3
14th August 2009
Old 14th August 2009
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Ethan Winer's Avatar
 

Quote:
Originally Posted by haryy View Post
If 1 channel produces -108db, then what happens when you add 50 tracks? Is it a 3db per doubling?
Yes, but that's only for noise. In the thread Teddy linked I explain why this doesn't hold for distortion on different tracks. Track distortion is not coherent so it doesn't add.

--Ethan
haryy
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#4
15th August 2009
Old 15th August 2009
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So there's no further degradation as for the THD+n regardless of number of (converted from analog) tracks?
#5
15th August 2009
Old 15th August 2009
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Yes, as I said above, distortion on different tracks does not add because the tracks are different and so create different artifacts.

--Ethan
haryy
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#6
15th August 2009
Old 15th August 2009
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Isn't it the same when there's a signal and when there's silence? (just asking)
Does the thd "modulates" the signal so it takes a different form for every recording we make?
#7
15th August 2009
Old 15th August 2009
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Ethan Winer's Avatar
 

Quote:
Originally Posted by haryy View Post
Isn't it the same when there's a signal and when there's silence?
When there's silence that would only be noise. Distortion happens only when there's a signal.

Quote:
Does the thd "modulates" the signal so it takes a different form for every recording we make?
Distortion shows up as additional frequencies that were not present in the original signal. There's THD and also IM, though IM is generally more damaging because the added frequencies are not necessarily related musically to the original.

--Ethan
haryy
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#8
15th August 2009
Old 15th August 2009
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InterModulation distortion?

It's not as "harmonic" as the THD you mean (?)
But it doesn't add also, does it?
#9
15th August 2009
Old 15th August 2009
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haryy
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#10
15th August 2009
Old 15th August 2009
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Thanks for your time and help.
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