Re: arsclist ELP Laser Turntable; Full 3-D mapping of groove?

["Steve Smolian" <smolians@xxxxxxxxx>]

The problem here is that the waveforms won't be exact from copy to copy.  No
record is exactly on center, and it's not likely that each copy will have
the needle start playing from the identical spot.

Steve Smolian


----- Original Message -----
From: <Mwcpc6@xxxxxxx>
To: <ARSCLIST@xxxxxxxxxxxxxxxx>
Sent: Thursday, December 05, 2002 5:42 PM
Subject: Re: arsclist ELP Laser Turntable; Full 3-D mapping of groove?


> In a message dated 12/04/2002 7:22:31 PM Eastern Standard Time,
> jon@xxxxxxxxxxx writes:
>
> >
> >  Obviously, a groove mapping technique would be an expensive proposition
> >  to research and develop, and probably to even operate (has somebody
> >  already tried this?), so it may have limited use, maybe for extremely
> >  rare and noteworthy recordings where a master pressing or a shellac
> >  pressing in E condition or better is not available. There's quite a
> >  few researchers at the National Labs with the requisite backgrounds
> >  who would find this to be a real interesting problem and may consider
> >  exploring it on their own time with minimal or no funding, at least to
> >  research the feasibility of it for writing a cogent proposal. There is
> >  a lot of interesting technologies which have been developed at the
> >  National Labs over the years.
> >
> >  Comments? Criticisms?
> >
> >  Jon
>
> It seems that there are several approaches that make use of state of the
art
> technology to recover relatively ancient recordings.  One I would like to
see
> tried is treating the signals from several copies of the same recording as
> noisy data streams and using correlation functions to recover the original
> signal.
>
> If all "data" not common to several pressings from the same stamper or
> several stampers from the same master were rejected, one would be left
with
> only the signal on the original stamper or master, which could be better
than
> that retrievable from the aged original, if it still exists.
>
> Is anyone working on something like this?
>
> Mike Csontos
> -
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