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Re: Correction - proposal for issue 286 [Was Re: New proposal for issue 287 (volume control)]

From: Charles McCathieNevile <charles@w3.org>
Date: Tue, 4 Jul 2000 02:10:42 -0400 (EDT)
To: Ian Jacobs <ij@w3.org>
cc: w3c-wai-ua@w3.org
Message-ID: <Pine.LNX.4.20.0007040204440.3412-100000@tux.w3.org>
In general I agree with the proposal, although I note that the second
proposed checkpoint, about synthesized speech, is really just a special case
of the first.

The question raised in my mind is about applicability, and hinges on teh
definition of sound sources - what if the speech synthesis and something else
are generated by the same system component (whether hardware or software)?

further comments sprinkled - look for IJ and CMN
IJ
  > 4) This is a fairly serious change of scope from the
  >    previous checkpoints about volume.

CMN I am not convinced about this - could you please expand if it is
important (but I am not sure that it is)
IJ 
  > 5) This discussion suggests a content issue: should the WCAG
  >    be recommending that authors provide content in recognizable
  >    tracks (e.g., a SMIL presentation) as opposed to formats
  >    without tracks (e.g., a WAV file)?

CMN Yes. I think this is already implicit in the use of appropriate
structure, but the checkpoints at the moment are very HTML specific. I will
follow this up on the WCAG list.

cheers

Charles McCN

> 
  > Based on these comments, I'd like to propose that we reconsider
  > the resolution. I have the following wording for the proposed
  > checkpoint (proposed, but in no document yet):
  > 
  >    "Allow the user to control independently the volumes of
  >     audio sources recognized as distinct."
  > 
  > I propose we create two checkpoints instead to emphasize
  > the critical cases and to reduce the scope of the
  > change:
  > 
  > <NEW 1>
  >    "Allow the user to control independently the volumes
  >     of audio sources synchronized to play simultaneously.
  > </NEW 1>
  > 
  > <NEW 2>
  >    "Allow the user to control the synthesized speech volume
  >     independently of other sources of audio."
  >        Note: It is expected that speech synthesizer volume will
  >              be set at the system level.
  > </NEW 2>
  > 
  > Notes:
  > 
  >  - The second checkpoint is much closer in scope to the
  >    previous version of the speech volume checkpoint. For
  >    example, from the Candidate Recommendation:
  > 
  >      "Allow the user to configure synthesized speech volume."
  > 
  >    However, the new version talks about control and not
  >    just configuration.
  > 
  >  - As usual, if the UA cannot determine that two sources of
  >    audio should be played simultaneously, the first
  >    checkpoint does not apply.
  > 
  > Comments welcome,
  > 
  >  - Ian
  > 
  > [1] http://cmos-eng.rehab.uiuc.edu/ua-issues/issues-linear.html#287
  > [2] http://lists.w3.org/Archives/Public/w3c-wai-ua/2000AprJun/0506.html
  > 
  > --
  > Ian Jacobs (jacobs@w3.org)   http://www.w3.org/People/Jacobs
  > Tel:                         +1 831 457-2842
  > Cell:                        +1 917 450-8783
  
  -- 
  Ian Jacobs (jacobs@w3.org)   http://www.w3.org/People/Jacobs
  Tel:                         +1 831 457-2842
  Cell:                        +1 917 450-8783
  

--
Charles McCathieNevile    mailto:charles@w3.org    phone: +61 (0) 409 134 136
W3C Web Accessibility Initiative                      http://www.w3.org/WAI
Location: I-cubed, 110 Victoria Street, Carlton VIC 3053
Postal: GPO Box 2476V, Melbourne 3001,  Australia 
Received on Tuesday, 4 July 2000 02:10:44 GMT

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