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Re: Proposal to delete checkpoint 3.2 and expand 4.10

From: Jon Gunderson <jongund@uiuc.edu>
Date: Mon, 12 Jun 2000 08:47:31 -0500
Message-Id: <>
To: Ian Jacobs <ij@w3.org>, w3c-wai-ua@w3.org

How do you define an audio source?
Is a source an author specification of some type of audio resource or is it 
an API or hardware used to play the author specified audio resource?


At 10:28 PM 6/9/00 -0400, Ian Jacobs wrote:
>After several hours of discussions today with Charles
>and Eric Hansen, I would like to propose the following
>changes to the document. The checkpoint numbers are those
>of the 7 May Guidelines [1].
>This proposal concerns "volume" related checkpoints. Here
>are the checkpoints that include requirements for volume
>3.2 Allow the user to turn on and off rendering of
>     background audio. [Priority 1]
>3.4 Allow the user to turn on and off rendering of
>     audio. [Priority 1]
>4.8 Allow the user to configure the audio volume.
>     [Priority 2]
>4.10 Allow the user to configure synthesized speech volume.
>     [Priority 1]
>At the 8 June teleconference, we resolved to change
>the priority of 4.8 to P1.
>I propose changing the requirements embodied by
>these three checkpoints to the following:
>  1) On/off control of global audio
>     (When audio is a distraction. This is a special
>      case of the second requirement, but can stand alone.)
>  2) Control of global audio volume
>     (For users who are hard of hearing and users for whom
>      audio is a distraction.)
>  3) Relative control of volume among audio objects.
>     (Currently, this is only applied to the particular
>      case of synthesized speech. For notes on discussion
>      about this requirement, refer to 8 June minutes [2].)
>Note that checkpoint 3.2 is about "background audio". What is the
>difference between turning off background audio and turning
>off audio, except when background audio is an identifiable track
>that may be turned off independently of other audio? I'm not
>sure there is a difference, but to capture the requirement
>of being able to make background audio go away, I propose
>augmenting the scope of 4.10 to cover all audio objects.
>Thus, we would end up with the following three priority
>one checkpoints:
>1) Allow the user to turn on and off rendering of audio.
>2) Allow the user to configure the audio volume.
>3) Allow the user to control the volume of audio sources
>    independently.
>1) The applicability clause is in effect here. Therefore,
>    if some other agent renders the audio, that agent is
>    responsible for volume control.
>2) It might be possible to narrow the scope of checkpoint
>    three to the two cases already discussed in the document:
>    background audio and synthesized speech. However, defining
>    "background audio" is difficult and I don't know whether
>    life would be any easier on developers if we did. Does anyone
>    know of existing software where the user can control the
>    volume of different audio sources independently?
>  - Ian
>[1] http://www.w3.org/WAI/UA/WD-UAAG10-20000507
>[2] http://lists.w3.org/Archives/Public/w3c-wai-ua/2000AprJun/0429.html
>Ian Jacobs (jacobs@w3.org)   http://www.w3.org/People/Jacobs
>Tel:                         +1 831 457-2842
>Cell:                        +1 917 450-8783

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 Monday, 12 June 2000 09:47:58 UTC

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