VARI-SOUND: a varifocal lens for sound

Memoli, Gianluca, Chisari, Letizia, Eccles, Jonathan P, Caleap, Mihai, Drinkwater, Bruce W and Subramanian, Sriram (2019) VARI-SOUND: a varifocal lens for sound. CHI '19 CHI Conference on Human Factors in Computing Systems, Glasgow, Scotland, May 04-09 2019. Published in: Proceedings of the 2019 CHI Conference on Human Factors in Computing Systems. (483) 1-14. Association for Computing Machinery ISBN 9781450359702

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Abstract

Centuries of development in optics have given us passive devices (i.e. lenses, mirrors and filters) to enrich audience immersivity with light effects, but there is nothing similar for sound. Beam-forming in concert halls and outdoor gigs still requires a large number of speakers, while headphones are still the state-of-the-art for personalized audio immersivity in VR. In this work, we show how 3D printed acoustic meta-surfaces, assembled into the equivalent of optical systems, may offer a different solution. We demonstrate how to build them and how to use simple design tools, like the thin-lens equation, also for sound. We present some key acoustic devices, like a "collimator", to transform a standard computer speaker into an acoustic "spotlight"; and a "magnifying glass", to create sound sources coming from distinct locations than the speaker itself. Finally, we demonstrate an acoustic varifocal lens, discussing applications equivalent to auto-focus cameras and VR headsets and the limitations of the technology.

Item Type: Conference Proceedings
Schools and Departments: School of Engineering and Informatics > Informatics
Research Centres and Groups: Creative Technology
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Depositing User: Gianluca Memoli
Date Deposited: 09 Jul 2019 11:20
Last Modified: 09 Jul 2019 11:25
URI: http://sro.sussex.ac.uk/id/eprint/84783

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