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RE: audio contrast

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Sun, 31 Oct 2004 15:37:32 -0600
To: <w3c-wai-gl@w3.org>
Message-ID: <auto-000148774403@spamarrest.com>
Hi David,


 Yes - I noted that they did say the same thing about 20db.   I just posted
it as reinforcement since there is usually so much confusion with the
different db's.


Regarding the right number for the guideline:

    I think 20db is the right number for the guideline.   There is no number
that would be acceptable to movie makers and that would meet the needs of
people with hearing disabilities.    That is why this is at Level 3.  It is
advice for people who are making things and want to go the extra yard to
make them accessible.   





 -- ------------------------------ 
Gregg C Vanderheiden Ph.D. 
Professor - Ind. Engr. & BioMed Engr.
Director - Trace R & D Center 
University of Wisconsin-Madison 


From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of David MacDonald
Sent: Sunday, October 31, 2004 1:26 PM
To: w3c-wai-gl@w3.org
Subject: re:audio contrast


Hi Greg


Thanks for posting your lesson on decibels. It reiterates what I posted to
the list and is in perfect alignment with my findings and calculations.
Perhaps we should open this up again to the hard of hearing community
because the 20dbs contrast is in my opinion going to be difficult to sell to
many film makers etc.


In doing this exercise of making the examples, I realized that the concept
of "audio contrast" may be something to take back to industry. I envision
new media devices which will have audio contrast as a control (like tone and
bass). New media such as films etc. would deliver the audio background
separately from the audio foreground so the consumer can adjust the
contrast. (Of course this is outside the scope of our work).



David MacDonald


Access empowers people...
         .Barriers disable them.




Received on Sunday, 31 October 2004 21:37:43 UTC

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