DennyL wrote: > I don't understand how this dicussion can continue without reference to > error correction. My understanding is that the clever people at Sony > and Philips who developed the Red Book CD standard anticipated that > there would be problems getting the data off the CD, and incorporated > error correction, meaning that there is a lot more data on the CD than > we actually want to end up with, because there is redundancy required > by the error correction.
Yes, the RedBook has several clever error detection and correction schemes. But the spec defaults to a "fake it" mode when errors exceed what it can handle. The player is required to continue making music with the most recent frequency spectrum -- sort of the equivalent to a piano player saying "I don't know that tune, but if you hum a few bars, I'll fake it" > My understanding is that the the Red book standard allows an > error rate of about one error bit per second. The other big problem is that data file extraction (used in ripping) uses different read technologies than music playing. It took several years from the release of the CD spec to when computers had CD readers (I got my first CD player ~86 and my first computer CD (1X) in ~91.) A computer does not read the disk the same way a vintage 85 CD player would play it. Back when I was really into this, I even knew the differences. There were a few small changes to the CD spec that if Sony/Philips had included, would have made computer extracting much easier, faster, and more reliable. Of course, the CD was designed to be (1) a replacement for cassettes that lead to rampant bootlegging and (2) read only. -- Pat Farrell http://www.pfarrell.com/ _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
