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Re: Resolution of Issue PR#285 on audio volume control

From: Jon Gunderson <jongund@uiuc.edu>
Date: Wed, 07 Jun 2000 08:59:36 -0500
Message-Id: <>
To: Charles McCathieNevile <charles@w3.org>, "Gregory J. Rosmaita" <unagi69@concentric.net>
Cc: User Agent Guidelines Emailing List <w3c-wai-ua@w3.org>
Charles and Gregory,
We all ready have as part of the minimum requirement for 4.8 and 4.10 to be 
able to independently control the volume of synthesized speech and sampled 
speech.  Raising 4.8 to P1 level does not affect that minimal requirement.


At 07:54 AM 6/7/00 -0400, Charles McCathieNevile wrote:
>I would advance the same argument as Gregory. I think the requirement is to
>be able to individually control the volume of each sound source - whatever it
>is. Whether this is satisfied by the user agent or underlying system is
>immaterial, but in practical terms I suspect that User agents are not always
>easily able to expose multiple sources to the underlying system for
>individual control.
>Note also that synthesised speech is not necessarily the only form of audio
>content that is important - for users with visual, cognitive, and hearing
>disabilities there may be several types of audio running (music, synthesised
>speech for text content, spoken content such as audio descriptions, etc) and
>being able to distinguish what is going on in each channel (for example by
>playing one speech channel at a time) is the difference between having access
>and not. Just think of a teleconference where several people are speaking -
>our volume control is the chair...
>Charles McCN
>On Wed, 7 Jun 2000, Gregory J. Rosmaita wrote:
>   Jon wrote
>   quote
>   I encourage people to present arguments on changing checkpoint 4.8 from P2
>   to P1.
>   unquote
>   aloha, jon!
>   the argument is quite simple...   there are many instances when i need
>   synthesized speech at a certain level--which i can control on-the-fly
>   thanks to the P1 requirement, if the wording of 4.10 is restored from
>   "configure" to "control"--and the audio to play at a different level, in
>   order that i can clearly and distinctly hear the 2 simultaneously...
>   if i can't hear the synthesized speech because i can't adjust the 
> volume of
>   the audio source as it is playing, save by recourse to the OS' native
>   volume control interface, i may have already missed out on what i 
> needed to
>   hear -- the synthesized content in conjunction with the audio -- 
> especially
>   if the audio is being streamed...  it's akin to reading a page while
>   looking at the illustrations with your peripheral vision, or the type of
>   integration of textual and non-textual content one's brain makes to give
>   one the gestalt view of the page when it is perceived in screenfulls, so i
>   vote to raise 4.8 from P2 to P1
>   gregory.
>Charles McCathieNevile    mailto:charles@w3.org    phone: +61 (0) 409 134 136
>W3C Web Accessibility Initiative                      http://www.w3.org/WAI
>Location: I-cubed, 110 Victoria Street, Carlton VIC 3053
>Postal: GPO Box 2476V, Melbourne 3001,  Australia

Jon Gunderson, Ph.D., ATP
Coordinator of Assistive Communication and Information Technology
Division of Rehabilitation - Education Services
College of Applied Life Studies
University of Illinois at Urbana/Champaign
1207 S. Oak Street, Champaign, IL  61820

Voice: (217) 244-5870
Fax: (217) 333-0248

E-mail: jongund@uiuc.edu

WWW: http://www.staff.uiuc.edu/~jongund
WWW: http://www.w3.org/wai/ua
Received on Wednesday, 7 June 2000 10:00:01 UTC

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