- From: Harvey Bingham <hbingham@acm.org>
- Date: Tue, 13 Jun 2000 14:00:09 -0400
- To: w3c-wai-ua@w3.org
At 2000-06-12 10:43-0400, 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 I note that the "author" for the sound source may well be a professional narrator, reading what the traditional author wrote, as is used with digital talking books. That is quite different from synthesized speech. I trust you do not mean to exclude such narrations. It does raise issues of synchronization and navigation, as addressed by SMIL. Does that come under: 3.4 allow the user to turn on and off the rendering of audio. How about another: 3.x allow the user to select audio source of text: synthesized speech or pre-recorded. Regards/Harvey > > 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 Tuesday, 13 June 2000 14:26:30 UTC