- From: Harvey Bingham <hbingham@acm.org>
- Date: Thu, 13 Jun 2002 12:25:55 -0400
- To: w3c-wai-ua@w3.org
4.3.3. For a prerecorded audio track including audio-only presentations,
provide at least one setting between 75% and 80% of
the original speed.
----
From the Digital Talking Book Specification ANSI/NISO Z37.86-2002
http://www.niso.org/standards/resources/Z39-86-2002.html
15. Time-Scale Modification *
(This section is normative.)
It is strongly recommended that playback systems implement Time-Scale
Modification
to enable user control of playback speed. Playback rates continuously
variable from one-third
to three times normal speed are recommended. It is also recommended that
players allow users the option of disabling pitch correction during TSM
operation.
All time offsets in a Digital Talking Book (DTB) (e.g., SMIL and NCX
clipBegin/clipEnd,
bookmark timeOffsets, etc.), are based on normal play speed. In order to
maintain
synchronization, a player must process time offsets independently of actual
playback speed.
...
* Time-scale modification varies playback rate (both slower and faster than
real time) while maintaining constant pitch.
Regards/Harvey Bingham
Received on Thursday, 13 June 2002 12:28:26 UTC