autopilot;268175 Wrote: > But will an error that small even be perceivable to the human, or are we > splitting hairs here? Often, when EAC reports an error, the result is a "pop" on one of the channels. Zooming in on the error with the audio editor (I use Cool Edit) usually reveals a single errant sample way out of line with the rest of the curve. The simple way to fix it is just to delete that sample. I've never been able to hear the result of a single deleted sample. Also, depending on how far out of line the errant sample is, you may never hear it in the first place.
The latest batch of discs I'm reading has a Steppenwolf Greatest Hits disc with 3 of 16 tracks with errors caused by pinholes in the aluminum plating on the CD. I've tried reading the tracks on 3 different drives and am manually editing out the ticks where EAC didn't get a good read. With most discs, I get "All tracks accurately ripped", which I think is pretty amazing! Sometimes I get "Not in database" and every once in a while I get "No tracks can be verified accurate; you may have a different pressing". One interesting thing I've noticed is on discs with mono tracks. In theory these discs could be self-checking since both channels should be identical. In practice, this is rarely the case; there is often a slight channel imbalance coupled with high-frequency phase errors, presumably caused because they were digitized by a stereo ADC. However a few times I have seen discs with (except for dither) numerically identical channels. And I've seen discs which AccurateRip verifies as correct which have ocasional big blips when the channels are differenced, indicating that the errors were written onto the disc by the pressing plant. Usually such errors are inaudible, which gives me the idea that absolute numeric perfection is not really necessary nor even always achieved with digital audio. Some of the worst examples of very popular mono discs where the channels don't even come close to matching are the early Beatles discs. On certain tracks, the mono tape was played back on a stereo machine with a stereo chain all the way to the ADC. When the difference of the channels is taken, every flaw in the master tape, folds, slices, fingerprints, shedding oxide, etc is magnified. The result is rather bad! EMI doesn't rate a very high score in my book for that one... -- Timothy Stockman ------------------------------------------------------------------------ Timothy Stockman's Profile: http://forums.slimdevices.com/member.php?userid=8867 View this thread: http://forums.slimdevices.com/showthread.php?t=43348 _______________________________________________ ripping mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/ripping
