Local variations of speaker-oriented acoustic parameters in typical classrooms: a simulation study

Invited paper

David Pelegrin Garcia

Lab. of Acoustics and Thermal Physics,KU Leuven

Tuesday 2 june, 2015, 10:00 - 10:20

0.9 Athens (118)

Classrooms are important spaces were teaching and learning takes place primarily through acoustic communication, which ideally should not be hampered by the acoustic conditions (geometry, materials and noise) but enhanced. Therefore, acoustic design is important to optimize speech intelligibility and vocal comfort, while limiting the vocal effort required to talk in. Two speaker-oriented parameters have been proposed: the Voice Support, linked to vocal effort, and the Decay Time at the Ears, linked to vocal comfort. Theoretical models exist for the prediction of room-averaged values of these parameters which overlook important local variations that teachers can use in their own benefit, as e.g. getting closer to a reflecting surface to increase the voice support. The present paper presents a method to calculate these acoustic parameters from commercial acoustic simulation software and studies the local variations of these parameters in typical classrooms, as well as the effect of talker orientation.

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