Effect Analysis of High Speed Presentations of Educational Video Utilizing Synthetic Speech

Abstract

This study aims to clarify the effect of presenting educational video utilizing synthetic speech at a high speed. In the experiment, 40 university students were shown educational video dealing with declarative knowledge in 4 conditions: actual speed (1x) synthetic speech, double speed (2x) synthetic speech, actual speed (1x) normal speech, and double speed (2x) normal speech. An analysis of the comprehension test results showed no significant difference in the learning effect according to presentation condition, suggesting that speed and speech factors may have no impact on the learning effect. The results of a subjective questionnaire indicated that whereas the perception of normal speech as strange tends to be affected by the speed factor, the perception of synthetic speech as strange does not tend to be affected by that factor.