- From: Ian Jacobs <ij@w3.org>
- Date: Mon, 12 Jun 2000 10:43:51 -0400
- 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 UTC