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Dear Ed,

The general direction of large collection archiving is to store 
everything in managed servers with off-site backup. We can call that 
many things, including "digital repository" and "trusted digital archive".

For a collection of your size, the options for disk-based or 
tape-based off-site backup are both viable. The primary storage would 
be a robust disk drive system.

Selecting collection management software is a big hurdle and I have 
no recommendations in that area.

IASA standards state that a minimum of 48,000 samples per second 
should be used when digitizing and most of us adhere to the 24-bit 
recommendation as well. As IASA says, "some material would benefit 
from higher sample rates". This would be high-quality music and drama 
recordings, not "announce booth" or small-studio readings.

I think the consensus is that the material which is already digitized 
at other sample rates and bit depths (as long as they are very common 
ones like 44,100 samples per second and 16 bits (CD and some DAT)) 
should be ingested into the digital repository in their native 
format. This may invite differing opinions.

Storing the material as WAV files in the digital repository is also 
the accepted standard. MP3 and other compressed files may be 
generated at the same time in order to provide lower-bit-rate access copies.

I have some hopefully useful information at 
www.richardhess.com/notes/ and you can read about the tape 
digitization and restoration work I do at www.richardhess.com/tape/

There are lists of resources on the ARSC web site ( 
www.arsc-aurio.org ). One of the most useful resources is the IASA 
TC-04 document (available from IASA), at least for the technical side 
of audio digitization.

In order to help you go through the collection and prioritize 
sub-portions, the FACET tool from Indiana University is quite useful 
as it helps to identify and quantify risks to the collection. That, 
and the documents from the Sound Directions project are available here:
http://www.dlib.indiana.edu/projects/sounddirections/

Many of us here can answer specific questions. We each have our own 
areas of experience.

A few of my "soapbox" items are:
   - Get as good a playback as possible -- this is the last time the 
tape will be played
   - Don't destroy/dispose of the original analog tapes
   - Just because person A can't play the tape doesn't mean person B 
can't as well.

A note on the last point: the hard disk drive I ranted about here a 
few weeks ago was unrecoverable both by CBL and DriveSavers. Most 
likely because of a well-intentioned, but ill-advised opening of the 
drive by a computer "consultant" prior to sending it to CBL. If 
you're not sure of the recovery method and you think something is 
wrong in any media, don't "guess" and don't take steps that may make 
the situation worse.

My summary paper of tape degradation factors was recently published 
in the ARSC Journal and now is online at
http://www.richardhess.com/tape/history/HESS_Tape_Degradation_ARSC_Journal_39-2.pdf

Good luck with a worthwhile and exciting project!

Cheers,

Richard

At 04:25 PM 2009-01-05, Morman, Ed wrote:
>Dear experts on recorded sound preservation,
>
>
>
>The National Federation of the Blind owns thousands, if not tens of
>thousands, of hours of sound recordings that we need to preserve in the
>most efficient way, while still having ready access to them.  All of our
>current recording is done digitally, and stored on MAM-A professional
>grade gold CDs.  Our collections extend back to the 1950s and include
>reel-to-reel and cassette masters, as well as digital audio tape and
>other digitized recordings on CDs.  Much of the digitization of the
>older material was done haphazardly.
>
>
>
>As you can imagine, the sound archives are quite important to an
>organization of blind people.  We would like retrospectively to insure
>that all our recordings are digitized professionally and stored in a
>little space as possible given concerns for preservation.
>
>
>
>We recently joined ARSC, and I signed up for this listserv in order to
>learn from folks in the sound preservation enterprise.
>
>
>
>Any advice you can provide will be much appreciated!
>
>
>
>I thank you in advance.
>
>
>
>Ed Morman
>
>
>
>
>
>Edward T. Morman, MSLS, PhD
>
>Director, Jacobus tenBroek Library
>
>NATIONAL FEDERATION OF THE BLIND JERNIGAN INSTITUTE
>
>1800 Johnson Street
>
>Baltimore MD 21230
>
>410.659.9314 x2225
>
>410.6595129 (fax)
>
>

Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada       (905) 713 6733     1-877-TAPE-FIX
Detailed contact information: http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.