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Re: Proposal to delete checkpoint 3.2 and expand 4.10

From: Ian Jacobs <ij@w3.org>
Date: Mon, 12 Jun 2000 10:43:51 -0400
Message-ID: <3944F727.D54D2E92@w3.org>
To: Jon Gunderson <jongund@uiuc.edu>
CC: w3c-wai-ua@w3.org
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
Received on Monday, 12 June 2000 10:43:56 GMT

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