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Audio and Video Talk
General Discussion
Audiophile sound quality off a hard drive
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<blockquote data-quote="gbyleveldt" data-source="post: 12930" data-attributes="member: 122"><p>Loopback test will always be 'optimistic', because the master and slave clocks in the audio interface will always be the same. It does not mean that they are not valid though. It is important to note that these tests establishes a sort of 'benchmark' for comparitive purposes. The moment you interface that unit to something else using a PLL or reclocking scheme you will have synch errors introduced, causing jitter. Also, as this external unit runs on a different PSU with a separate grounding scheme, you will have additional noise. All we can ever hope for is to limit these artefacts (by comparing it to our 'benchmark') to see how effective our implementation is.</p><p></p><p>That brings me to your statement. As the AP is external to whatever it is that you testing, there will always be errors introduced. If you were to do a loopback test on AP you will also have 'optimistic' results. ;D Bear in mind I've not yet seen an AP so this is also my opinion.</p></blockquote><p></p>
[QUOTE="gbyleveldt, post: 12930, member: 122"] Loopback test will always be 'optimistic', because the master and slave clocks in the audio interface will always be the same. It does not mean that they are not valid though. It is important to note that these tests establishes a sort of 'benchmark' for comparitive purposes. The moment you interface that unit to something else using a PLL or reclocking scheme you will have synch errors introduced, causing jitter. Also, as this external unit runs on a different PSU with a separate grounding scheme, you will have additional noise. All we can ever hope for is to limit these artefacts (by comparing it to our 'benchmark') to see how effective our implementation is. That brings me to your statement. As the AP is external to whatever it is that you testing, there will always be errors introduced. If you were to do a loopback test on AP you will also have 'optimistic' results. ;D Bear in mind I've not yet seen an AP so this is also my opinion. [/QUOTE]
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Audio and Video Talk
General Discussion
Audiophile sound quality off a hard drive
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