Subj : cleaning old 78 vinyls ?
To   : PASCAL SCHMIDT
From : TOM WALKER
Date : Sat Jun 18 2005 12:49 pm

PS>[laser turntable]
PS> RJT> I saw that once,  way too much money!  If they can put a laser into
PS> RJT> cdrom drives and other stuff they sure as heck oughta be able to do
PS> RJT> that cheaper,  as well.  I guess no demand,  though,  or something.
PS>I don't think it's too easy to read the audio "data" from a vinyl record wit
PS>laser. Records were not designed with that in mind, that's for sure. ;)

PS>My guess would be they use the laser, carefully positioned, to get a surface
PS>scan of the depth of the record groove. Add a complex mathematical model of
PS>that surface would influence a regual pickup unit and you can create a digit
PS>rendering of the original sound. Most of the records I own are not too even,
PS>they have bumps and sometimes even the middle hole is not really centered. I
PS>think it's difficult to keep the laser positioned correctly.

As I recaal soemwhere o nthe internet there is an excellent description
of the process. And I bleive they use three or so lasers to do the
reading.


PS>Plus as you say, I don't think there's much demand for what clearly is very
PS>specialized technology.

 That s why the Price is SO high. They are very special Technology for a
 Very Small nitch Market almost hand built units.
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