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Re: ACTION-238 Revise guidelines 4.9.6

From: Jan Richards <jan.richards@utoronto.ca>
Date: Wed, 18 Nov 2009 14:22:54 -0500
Message-ID: <4B04498E.1060507@utoronto.ca>
To: Markku Hakkinen <markku.hakkinen@gmail.com>
CC: UAWG list <w3c-wai-ua@w3.org>
Hi Mark,

I think we could be more consistent in the way these are stated. In one 
case we say "1/3 to 3 times" implying 33%-300% and in another we say at 
least one setting between 40% and 60% which implies a lowest setting of 
60% would be ok.

Cheers,
Jan


Markku Hakkinen wrote:
> 4.9.6 Playback Rate Adjustment for Multimedia Content.
> 
> The user can adjust playback rate of prerecorded content containing
> speech audio tracks such that all of the following are true (Level A):
> 
> -  The playback rate should be user adjustable between 1/3 and 3 times
> real time of the recorded content.
> 
> -  Recorded speech, whose playback rate has been adjusted by the user,
> should utilize pitch maintenance in order to avoid degradation of the
> speech quality.
> 
> If only a visual track is present, provide at least one setting
> between 40% and 60% of the original speed. (Level A)
> 
> When audio and video tracks are expected to be synchronized,
> synchronization is maintained as long as they are played at 75% of the
> original speed or higher. (Level A)
> 
> The UA should provide a function that resets the playback rate to
> normal (1x) . (Level A)
> 

-- 
Jan Richards, M.Sc.
User Interface Design Lead
Adaptive Technology Resource Centre (ATRC)
Faculty of Information
University of Toronto

   Email: jan.richards@utoronto.ca
   Web:   http://jan.atrc.utoronto.ca
   Phone: 416-946-7060
   Fax:   416-971-2896
Received on Wednesday, 18 November 2009 19:23:39 UTC

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