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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: RE: CD/ disc scratch repair (not sure if right forum) posted by JaroTheWise on August 5, 2015 at 00:50:33:
I'm sure, than, you are aquainted with something called an 'optical flat'. We used it to maintain FLATNESS of certain tooling. Putting the flat on a surface and illuminating with a monochromatic light produced an interference pattern. From this you could determine flatness of the inspected object.
The reason I bring this up? I'll bet $$ that a CD is 'specified' as having a certain surface flatness.
The lens which focuses on the 'pits' has an extremely SHORT depth of field which renders a few of the explanations I've heard for some 'digital problems' absolutely moot.
Now that I think about it, I wish I could still get at some of the goodies I USED to have routine access to. A Macbeth densitometer? Surface Profiler? Optical flat? Even a good 'scope, both micro and oscillo.
Those were the days!
Too much is never enough
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Follow Ups
- RE: CD/ disc scratch repair (not sure if right forum) - pictureguy 01:36:03 08/05/15 (3)
- RE: CD/ disc scratch repair (not sure if right forum) - JaroTheWise 02:00:30 08/05/15 (1)
- RE: CD/ disc scratch repair (not sure if right forum) - pictureguy 09:42:40 08/05/15 (0)
- RE: CD/ disc scratch repair (not sure if right forum) - JaroTheWise 01:55:05 08/05/15 (0)
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