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Old 17th March 2012, 10:06 AM   #111
sandyK is offline sandyK  Australia
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Originally Posted by godfrey View Post
You'd think so, wouldn't you? However I remember a previous similar thread that claimed audible differences between bit-identical files remained even after the files were uploaded to a server, then downloaded by others.
Differences did remain, but low level detail suffered some degradation compared with the original files.
We are now sending them as Uncompressed Zip files,( a "zipcreator" option) which helps to reduce the Filemail Server degradation over these long haul routes.As Ripley would say, "Believe It Or Not " A USB memory stick is a far better option.
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Old 17th March 2012, 10:21 AM   #112
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Originally Posted by godfrey View Post
You'd think so, wouldn't you? However I remember a previous similar thread that claimed audible differences between bit-identical files remained even after the files were uploaded to a server, then downloaded by others.
36% french people believe homeopathy is effective, so why not.....
 
Old 17th March 2012, 10:38 AM   #113
godfrey is offline godfrey  South Africa
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Originally Posted by Lazybutt View Post
homeopathy is effective, so why not.....
Good thinking! Is it possible to dilute a data file with extra zeroes though? You'd need a sort of anti-compression algorithm.
 
Old 17th March 2012, 10:45 AM   #114
Simon B is offline Simon B  United Kingdom
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Originally Posted by godfrey View Post
Good thinking! Is it possible to dilute a data file with extra zeroes though? You'd need a sort of anti-compression algorithm.
Excellent! The principles of homeopathy have clearly inspired and informed subjectivist audiophiles. Following them, we inevitably reach the conclusion that music will affect us most deeply if we dilute it with zeroes to the point that none of the original bits remain. QED





Last edited by Simon B; 17th March 2012 at 10:48 AM.
 
Old 17th March 2012, 10:51 AM   #115
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Originally Posted by Simon B View Post
we inevitably reach the conclusion that music will affect us most deeply if we dilute it with zeroes to the point that none of the original bits remain.
Most of the manufacturers of DAC chips have been doing this for a decade or more - except they call it 'oversampling'.
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Old 17th March 2012, 10:54 AM   #116
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OK,

So without being able to do any testing ( i'm away for another week) I can only rely on google.

AcurateRip, (what a gem, thanks Steve). It states that there are in fact differences in audio Rips, stands to reason otherwise the program would not exist. It also states that no rip is perfect and that the quality is dependant on the drive. Further it also compares a CRC with an internet database of CRC's. This sounds perfect except they don't tell us how they calculate CRC and if they're looking for exact or approximation or anything. The only thing they say they're looking for is silence and spikes, cliks and pops. SO i don't know what to make of this program other than it'll tell you if you've got dropouts or those horrible squelchy spikes.

The other program that shuts down services to make audio sound better

So back to Erin's original issue.

Given that we now know we won't ever get a perfect digital copy, how can we optimise the computer to get the best copy possible ???
 
Old 17th March 2012, 11:14 AM   #117
gk7 is offline gk7
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First we should know if the two rips are different or not.
To be on the safe side a decent checksum tool should be used, sha256 for example.
 
Old 17th March 2012, 11:20 AM   #118
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Sha256 will provide go/no go but using Audacity to attempt to null one by summing with the inverse of the other will provide a measure of the degree of corruption (if any).
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Old 17th March 2012, 11:20 AM   #119
Simon B is offline Simon B  United Kingdom
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First we should know if the two rips are different or not.
To be on the safe side a decent checksum tool should be used, sha256 for example.
Actually, no, you don't need anything other than a straight binary file comparison - fc on a windows box, given that both files to be compared are avilable for inspection. This is actually marginally more definite than any checksum
 
Old 17th March 2012, 11:23 AM   #120
Simon B is offline Simon B  United Kingdom
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Originally Posted by abraxalito View Post
Most of the manufacturers of DAC chips have been doing this for a decade or more - except they call it 'oversampling'.


Err no, that isn't what oversampling's about. Check this:

Oversampling - Wikipedia, the free encyclopedia

 

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