CD data recovery?

[Lennart Sorensen]

On Mon, Sep 20, 2004 at 04:57:02PM -0400, Henry Spencer wrote:
> On Mon, 20 Sep 2004, Lennart Sorensen wrote:
> > I wonder if someone could scan the cd surface at very high resolution
> > (maybe with a laser beam) and then take the scans of each piece and lign
> > up the tracks that way and create a virtual cd image and recover the
> > data from that.  Hmmm.  Does sound expensive.
> 
> Feasible in principle, I expect, but you'd need to work at exceedingly
> high resolution, and it would get pricey... 
> 
> (There are people already experimenting with scanning traditional 
> needle-and-groove LPs and recovering the sound, and apparently that can
> be done, although at present the audio quality is too poor for it to be
> a useful technique.  But CDs are a whole different order of magnitude.)

But CDs are also pits of known depths not analog variable depths the way
LPs are.  It should be a simpler ting to determine what the correct
value is, although higher resolution.  Not like laser discs which would
be a serious pain.

Lennart Sorensen
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