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In Reply to: RE: No resolution... posted by Presto on November 12, 2012 at 12:36:42
Measure all those billions of 1's and 0's and make sure they are all correct. You can do this with a microscope if you like, but it will surely take longer than 79 minutes. :-)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Follow Ups:
I've looked at pits using a regular microscope that belongs to E. Brad Meyer. This was back in the 1980's so I don't recall the details. It was clear that one could decode the information this way, but it would be more than tedious. (I have done this kind of decoding of 1's and 0's on communications lines while debugging hardware, and it's tedious to do a few dozen bytes.)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
http://www.exactaudiocopy.de/en/index.php/overview/sound-editor/glitch-removal/
One had better make sure they have those EAC settings just right... ;)
It would be a b1tch to have to check 1000 or more titles for glitches...
Cheers,
Presto
"It would be a b1tch to have to check 1000 or more titles for glitches..."
Exactly. I rip CDs so they can be sold as downloads. Before I upload them I have to check them to make sure the rip was OK. I use EAC and dBpoweramp to do this and if I get a secure rip then I am good to go. If the rip fails then I demand another copy of the CD from the source. Generally, I can't use Accurate Rip as these CDs aren't in the database, so I am relying on the error detection capability of my optical drive and the software. In this regard I have much more faith in dBpoweramp, because it is easier to set up. But EAC can be OK if one has set it up correctly and has verified this by testing with known bad CDs.
Listening is not an adequate test for quality. It is very easy to miss errors that someone else might hear (or that one might hear oneself on another day). Typical undetected or incorrectly corrected errors will be a tick, often audible but occasionally quite quiet. Interpolated errors (where a bad sample is guessed at by interpolation) can be harder to hear, if not impossible depending on the music. Usually they are hard to hear if one just listens to the error stream (bad music minus known good music), e.g. a one sample tick that is -40 dBfs.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
...I check extracted files with a wave editor for "glitches"...
Saves time and heartache! ;)
Cheers,
Presto
I once used a metalurgy lab's scanning electron microscope to examine the pits on a Red Book CD. I was hoping to confirm that there actually are 1s and 0s in the pits. But what I found was there wasn't anything at all in the pits, just a lot of empty space. What a ripoff!!
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