- From: Jon Gunderson <jongund@uiuc.edu>
- Date: Mon, 12 Jun 2000 08:47:31 -0500
- To: Ian Jacobs <ij@w3.org>, w3c-wai-ua@w3.org
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? Jon 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 Monday, 12 June 2000 09:47:58 UTC