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Nicholas Thieberger thien at unimelb.edu.au
Fri Aug 13 07:48:53 UTC 2004


Dear Roberta Rouge,

I don't know how you subscribed to this list, but the way to
unsubrcribe is not to send five messages to the list. I have
unsubscribed you now.

Nick Thieberger
List convenor

At 11:48 PM -0700 12/8/04, robertarouge at juno.com wrote:
>UNSUBSCRIBE
>Remove
>
>On Thu, 12 Aug 2004 23:25:04 -0700
><mailto:robertarouge at juno.com>robertarouge at juno.com writes:
>
>UNSUBSCRIBE
>
>On Fri, 13 Aug 2004 14:16:09 +1000 Nicholas Thieberger
><<mailto:thien at unimelb.edu.au>thien at unimelb.edu.au> writes:
>
>Downsampling to MP3 from wav won't change the timecodes, providing
>that the MP3 codec (the algorithm used to downsample) uses a linear
>and not random encoding. Its specifications should say that it
>produces a linear MP3 file.
>
>Copying digital files always results in the copy and the original
>being identical, that is one of the advantages of recording
>digitally. And so a master (archival and citable) audio file is the
>same as its copies, and they can be downsampled and transcribed and
>the transcript will also relate to the master copy. Making edited
>copies can lead to problems if you then invest effort into
>timecoding transcripts to files that are not archival and citable.
>
>I had exactly this problem with my own tapes, and still have a
>number of files where the citable version has different timecodes to
>the version I have been working with. It will take a little effort
>to realign my current transcripts to the archival version.
>
>Nick Thieberger
>
>
>At 1:35 PM +1000 13/8/04, Pascale Jacq wrote:
>
>>[....]
>>
>
>Final Questions:
>A further concern which emerged when I thought about downsampling to
>MP3 was: Would the time coding change from the original WAV format?
>The aim of archiving linguistic data is to make it consistent,
>durable, catalogued and thus easily accessible (always back to the
>original source) in the future by those to whom the speakers allow
>data access.
>I've already had the experience of a DAT tape 'drop out' of 23
>seconds in the digitisation process. Luckily the Master copy kept at
>AIATSIS had these 23 seconds of material and they could make a 'red
>book' copy for our use. However, I noticed that the time coding of
>the first Master CD we had was now one second out from the 'red
>book' copy (in addition to the 23 seconds) and thus I wonder if any
>copy made from the original Master would not share the same time
>coding?
>
>This is a serious issue to consider if we are to use hyperlinks to
>audio recordings, and I'd appreciate any advice, comments or similar
>experiences you may have.
>
>
>
>
>
>


--

ARC Postdoctoral Fellow
Department of Linguistics and Applied Linguistics
University of Melbourne
Parkville, 3010
Australia

http://www.linguistics.unimelb.edu.au/thieberger.html/

ph: 03 8344 5185
fax: 03 8344 8990
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