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Caption synchronization tolerance

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Mon, 27 Aug 2001 19:34:59 -0500
To: "GLWAI Guidelines WG \(GL - WAI Guidelines WG\)" <w3c-wai-gl@w3.org>
Cc: "Larry Goldberg" <larry_goldberg@wgbh.org>, <geoff_freed@wgbh.org>
Message-ID: <003001c12f59$48365680$066fa8c0@750>
>Meeting minutes say:
 >>#67WC ask Geoff Freed or someone at WBGH.
 >>JW GV didn't want a number.
 >>Action WC: Ask Geoff.

Not quite

What I said was that I didn't know if it was possible to create a
number.   Live captioning is delayed for a number of reasons --
including allowing people to read and correct the captions before
transmission.   That delay is unavoidable today.   Yet that delay would
be unacceptable in a captioned movie.

Also, when doing training, you want the captions to lead any important
visual event.  That is, you don’t want the person reading the caption
when they should be looking at the screen to see something critical.
So having a time gap criterion may yield either an impossible goal or a
goal that is way too loose for general use.

Larry Goldberg or Geoff Freed would have the answer though.  Perhaps
there is a standard for Pre-captioned and another for Live-captioned.
I would suspect though that these should be recommendations or targets
(and should be in techniques) rather than sufficiency criteria which are

Geoff?  Larry?


-- ------------------------------
Gregg C Vanderheiden Ph.D.
Professor - Human Factors
Dept of Ind. Engr. - U of Wis.
Director - Trace R & D Center
Gv@trace.wisc.edu <mailto:Gv@trace.wisc.edu>, <http://trace.wisc.edu/>
FAX 608/262-8848 
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Received on Monday, 27 August 2001 19:44:11 UTC

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