Half the information on CDs is analogue


I would like to argue that one of the reasons that some transports sound significantly better than others is because much of the information on a given CD is actually analogue (analog) information.
An excellent transport does not just read digital information: 1s and 0s (offs and ons); it must be sensitive enough to pick up the other information that has been stored as a physical property of the CD medium. This 'physical' information, like the tiny bumps in the groove of a vinyl record, is analogue information.

Before I say more I'd like to hear what others think.
exlibris

Showing 9 responses by eldartford

Because the disc is, in a sense, an analog representation of a digital data stream, the raw data is imperfect. But we don't listen to raw data. Corrupted data is to be expected, and the signal information is encoded with an error correction algorithm that yields "clean" data.
Exlibris...Your mention of "gaps" and "best guesses" indicates that you have no idea how R-S error correction encoding works. Go study!!
Some computer geek ought to record the digital data stream (after error correction)as generated by two or more transports. Then write a program to time slip one file until it syncs up with the other, and then do a bit by bit compare of the files. I bet they will match perfectly.

There may be other transport characteristics which affect sound. Jitter is often quoted. What if one transport ran slightly faster or slower than the other. Quite small pitch changes affect music.
Sean...Did it ever occur to you that the "TONS of equalization" that you say is applied to digital recordings may actually be the removal of equalization that was applied to make vinyl sound good? There are several digital recording labels that claim to use no electronic equalization or other processing at all.
Shadorne...Me neither. Perhaps we are lucky. They say that having absolute pitch hearing makes a lot of music, which is off key, sound bad.
Aside from RIAA equalization, lots of tricks are used to make vinyl sound good. The one I like is RCA "Dynagroove". We all know that the contact pressure of the stylus is huge, and vinyl is flexible. RCA figured out that flexure of the vinyl is predictable from the modulation being cut, and developed some kind of secret algorithm to compensate. Of course the cartridge compliance would affect the flexure, so their compensation would only be right for some "average" cartridge.
Shadorne...For many, if not most, applications, a digital implementation is both superior in performance and lower in cost. However, one cannot jump to the conclusion that this is true for every application: eg: audio. (But I do agree with you, mostly).

Sean...Not all Redbook CDs "suck". I have a few that are really superb, as good as most SACD or DVDA. This has mostly to do with the skill and care (not to mention luck) applied to the recording and mixing of the program.
As to vinyl being "better" it all depends on the meaning of "better". (Sorry Bill). If one is distracted by pops, clicks, and surface noise, and annoyed by having to get up halfway through a side to clean a fuzz ball off the stylus it is hard to appreciate the sound.
Exlibris...Thanks for the info.

I also made a mistake once. I thought I was wrong about something, but I wasn't :-)