Time-Expanded Audio For Learning
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Harrigan, K. (2000). Time-Expanded Audio For Learning. In J. Bourdeau & R. Heller (Eds.), Proceedings of World Conference on Educational Multimedia, Hypermedia and Telecommunications 2000 (pp. 1358-1360). Chesapeake, VA: AACE.
Retrieved from http://www.editlib.org/p/16292.
World Conference on Educational Multimedia, Hypermedia and Telecommunications (EDMEDIA) 2000
Jacqueline Bourdeau & Rachelle Heller
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Table of Contents
Research has been conducted on building tools that allow users to control the speed of audio when playing audio on a computer and some commercial products are beginning to appear on the market (Eloguent, 1999). The research to date has focused exclusively on time-compressed (i.e. speeded-up) audio with an emphasis on improving the user interface (Arons, 1997) and improving learning efficiency (i.e. learning per unit of time) (Harrigan, 1995a; Harrigan, 1999). The research has shown that audio can be time-compressed by approximately 50% without any loss of comprehension or retention and that learners do use the time-compressed audio if given the controls in the user interface. The research has also shown that using a known technique, called SOLA ( Roucos & Wilgus, 1985), speech can be time-compressd without any significant change of pitch which is much preferred by learners over simply playing the audio faster which producing a change in pitch and what is often referred to as the "Mickey Mouse" effect. This paper reports on the first experiments that have been conducted using SOLA to time-expand (i.e. slow down) audio without any significant pitch change. These preliminary experiments used subjects who had no special needs but the end use of this technique is envisioned to be for people with special needs such as those with acquired brain injuries.
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