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Re: Proposed minimal requirements for audio/speech checkpoints.

From: Charles McCathieNevile <charles@w3.org>
Date: Mon, 12 Jun 2000 16:30:38 -0400 (EDT)
To: Ian Jacobs <ij@w3.org>
cc: w3c-wai-ua@w3.org
Message-ID: <Pine.LNX.4.20.0006121630280.14858-100000@tux.w3.org>
This seems like a reasonable approach.

Charles

On Mon, 12 Jun 2000, Ian Jacobs wrote:

  Hello,
  
  I propose that minimal requirements for the following checkpoints
  from the 10 June draft [1] be established on the basis of 
  property values in the CSS2 Recommendation [2]:
  
    4.8 Allow the user to configure and control the audio volume. 
    4.9 Allow the user to configure and control synthesized speech 
        playback rate.
    4.11 Allow the user to configure synthesized speech pitch, gender, 
         and other articulation characteristics.
  
  The relevant CSS2 properties are 'volume' (in CSS, for speech
  only, but we can generalize its values here) and the voice
  characteristics properties of section 19.8 [3]: 
  
  This is not a requirement for user agents to implement CSS, 
  but to allow the same range of abstract values as specified in CSS.
  CSS also allows numbers and percentages, but I don't want to
  make those requirements.
  
  For instance, for volume, the following range would be mapped to 
  six "real" levels by the user agent: silent, x-soft, soft,
  medium, loud, x-loud. Similarly, for speech-rate: x-slow,
  slow, medium, fast, x-fast. The relative rates "faster" and
  "slower" are relative values specific to CSS inheritance,
  so would not be required.
  
  I will write out the specific values for checkpoints 4.8, 4.9,
  and 4.11, but for now I want to get feedback as to whether
  people think that this is a reasonable approach. 
  
  IMPORTANT: I propose that we delete "and other articulation
  characteristics" from checkpoint 4.11 since that makes it
  much harder to specify minimal requirements.
  
   - Ian
  
  [1] http://www.w3.org/WAI/UA/WD-UAAG10-20000610/
  [2] http://www.w3.org/TR/1998/REC-CSS2-19980512
  [3]
  http://www.w3.org/TR/1998/REC-CSS2-19980512/aural.html#voice-char-props
  -- 
  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 Monday, 12 June 2000 16:30:39 GMT

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