Re: Proposal to delete checkpoint 3.2 and expand 4.10

Ian,
So every time a sound object is rendered to the user will be prompted for 
volume for that resource?

If is a SMIL document with 50 sounds sources they will need to specify 50 
volume levels?

Jon



At 10:43 AM 6/12/00 -0400, Ian Jacobs wrote:
>Jon Gunderson wrote:
> >
> > Ian,
> >
> > 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?
>
>Content provided by the author that when rendered,
>produces sound. This could be pre-recorded sounds
>or synthesized speech, for example.
>
>   - Ian
>
>
> > At 10:28 PM 6/9/00 -0400, Ian Jacobs wrote:
> > >Hello,
> > >
> > >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
> > >control:
> > >
> > >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.
> > >
> > >Notes:
> > >
> > >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
MC-574
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 Tuesday, 13 June 2000 09:19:31 UTC