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Re: Proposed minimal requirements for audio/speech checkpoints.

From: Ian Jacobs <ij@w3.org>
Date: Tue, 13 Jun 2000 13:40:09 -0400
Message-ID: <394671F9.60887CF3@w3.org>
To: Jon Gunderson <jongund@uiuc.edu>
CC: w3c-wai-ua@w3.org
Jon Gunderson wrote:
> 
> Ian,
> For synthesized speech I think the minimum requirement should be the range
> of values supported by the synthesizer.

For volume? 

>  Most synthesizer technology allows
> a user agent to enumerate these values for selection by the user.  The CSS
> specifications could be a second choice, if the API does not provide for
> enumeration.

Ok.
 
> This proposal would also allow the keeping of the current articulation
> charactersitics.  in the few people with head injuries that I haved worked
> with, pitch and gender were important factors and I would hate to see them
> removed.

Then let's add pitch and gender to the list. I have no problem
with a definitive list; the phrase "and other articulation
characteristics" will cause us problems. We can simply refer
to the properties in the Aural Cascading Style Sheets of CSS2

 _ Ian

 
> Jon
> 
> At 03:13 PM 6/12/00 -0400, you 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
> 
> 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

-- 
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 13:40:16 GMT

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