[vorbis] Copy protected CDs (off-topic)

[Dan Hollis]

On Wed, 20 Dec 2000, Gregory Maxwell wrote:
> On Wed, Dec 20, 2000 at 02:45:57PM -0800, Dan Hollis wrote:
> > On Wed, 20 Dec 2000, Segher Boessenkool wrote:
> > > But the most-occuring problem with CDR audio CD's is clock jitter, like
> > > Gregory mentioned.
> > Then this would affect non-CDR audio CDs equally as well.
> No, the better CD mastering equipment is VERY well isolated and much better
> clocked then CDR.

AFAIK the clocking is stored in the CDR pregroove from the manufacturer,
the recorder just puts the bits in there. The clocking is already placed
there by the CDR manufacturer long before the CD recorder ever touches
the media.

I guess it's possible some cheap manufacturers have a badly modulated
pregroove on their media. But even the cheapest media I've seen had no
problems.

The only problem I've ever had with CD-R is with a very old (1989) CD
player which couldn't read CD-R because the reflectivity of the CD-R was
wrong for its old model laser.

But even old CD players have to buffer some frames before feeding them to
the DAC because of subcode data. And even cheapest CD players modulate the
speed of the motor *from* the DAC, and not the other way round.

-Dan

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