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ARSCLIST  March 2006

ARSCLIST March 2006

Subject:

Re: back to the future, forward to the past

From:

"Prentice, Will" <[log in to unmask]>

Reply-To:

Association for Recorded Sound Discussion List <[log in to unmask]>

Date:

Wed, 22 Mar 2006 09:49:36 -0000

Content-Type:

text/plain

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text/plain (97 lines)

For the sake of completeness (OK, pedantry) there is another funded optical project in the UK, working closely with Carl Haber et al, concentrating on 3D imaging of cylinders. They currently have 2 different websites:
http://www.mech.soton.ac.uk/archivesound/ and
http://www.archivesound.co.uk/index.html

Will

..............................................
Will Prentice
Technical Services
British Library Sound Archive Tel: +44 (0)20-7412-7443
96 Euston Road Fax: +44 (0)20-7412-7416
London NW1 2DB http://www.bl.uk
UK http://cadensa.bl.uk (online catalogue)



-----Original Message-----
From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf Of David Seubert
Sent: 22 March 2006 06:23
To: [log in to unmask]
Subject: Re: [ARSCLIST] back to the future, forward to the past

There are several non-contact/optical research projects (not commercial
products like the ELP) that I know of for grooved media:

1) Carl Haber and colleagues at Lawrence Berkeley Lab are using 2-D and
3-D imaging to digitally capture groove modulation at high resolution
and then extract the audio signal. This has been discussed on this list
before and details are available here: http://www-cdf.lbl.gov/~av/.

2) The Laboratory of Metrology at the Ecole Polytechnique Fédérale de
Lausanne (Switzerland) is developing an optical turntable using fiber
optics to play back discs:
http://metwww.epfl.ch/lecteur_disques/LectDiscE.htm.

3) Researchers at the Ecole d'Ingénieurs de Fribourg (Switzerland) have
been creating analog images of discs with high contrast film (like
microfilm or photoduplication film) and then digitizing the image and
extracting the groove modulations from the image. They presented at JTS
2004 and have published in the IASA Journal. http://www.eif.ch/visualaudio/.

4) Syracuse University's Radius Project has been developing laser
playback for cylinders. They published a research report in First Monday
a couple of years ago:
http://www.firstmonday.dk/Issues/issue8_5/penn/index.html.

5) There was a project in Ukraine for optical playback of cylinders in
the mid-1990s that I read about in some optics journal, but I don't
think I could track down citation information without quite a bit of
effort. I think this is the same project:
http://members.chello.se/christer.hamp/phono/petrov.html.

My personal opinion is that there are two potential outcomes of this
research. Projects such as Haber's may be useful for extracting
information from unique/fragile/damaged media that should not be played
by contact methods because conventional playback would be impossible or
damage would be permanent and catastrophic. The second possible use
(perhaps for Haber's and the second Swiss group's research), would be
for mass digitization projects where images could be quickly captured
assembly-line style and then later processed to retrieve the audio
signal, eliminating the need for a technician sitting and watching the
record spin round and round and round in real time.

David Seubert
UCSB

Tom Fine wrote:

> Wasn't someone working on software that you would "play" a scan of a
> grooved disk? Seems like if such a thing ever got perfected, any
> decent letter-sized scanner could do 78 disks.
>
> I for one would volunteer to be part of a "process community," where
> someone like Steven would e-mail high-rez scans around and thus spread
> the complex and time-consuming computer processing around. Jazz 78's
> only, please. I see no need to do this with the large portion of 78's
> already professionally reissued on CD's. But the obscure ones are a
> different story.
>
> -- Tom Fine

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