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MuDiS: An Audio-independent, Wide-angle, and Leak-free Multi-directional Speaker

Published: 29 May 2024 Publication History

Abstract

This paper introduces a novel multi-directional speaker, named MuDiS, which utilizes a parametric array to generate highly focused sound beams in multiple directions. The system capitalizes on air nonlinearity to reproduce sound from ultrasounds, successfully overcoming challenges inherent in traditional parametric arrays, such as transducer size and wavefront shape. It supports three important features simultaneously: independent beams, wide-angle digital steering, and unintended leakage suppression. To address these challenges, we designed a specialized cell structure that connects ultrasonic transducers, redirecting an approximately omnidirectional wavefront with optimal interspacing. An optimization-based algorithm is developed to minimize unintended leakages, and a nonlinear distortion reduction scheme is proposed to enhance sound quality. The paper showcases a prototype demonstrating the system's capabilities as a multidirectional speaker with a wide sound projection angle. Experimental results validate the effectiveness of our approach. The proposed multi-beam projection system rivals the performance of commercially available single-beam projection directional speakers, and improved steering angle and sound fidelity compared to multi-beamforming performance using traditional parametric arrays.

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  • (2024)Visar: Projecting Virtual Sound Spots for Acoustic Augmented Reality Using Air NonlinearityProceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies10.1145/36785468:3(1-30)Online publication date: 9-Sep-2024
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  1. MuDiS: An Audio-independent, Wide-angle, and Leak-free Multi-directional Speaker

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    ACM MobiCom '24: Proceedings of the 30th Annual International Conference on Mobile Computing and Networking
    December 2024
    2476 pages
    ISBN:9798400704895
    DOI:10.1145/3636534
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    Published: 29 May 2024

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    • (2024)Visar: Projecting Virtual Sound Spots for Acoustic Augmented Reality Using Air NonlinearityProceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies10.1145/36785468:3(1-30)Online publication date: 9-Sep-2024
    • (2024)Enable Touch-based Communication between Laptop and SmartwatchCompanion of the 2024 on ACM International Joint Conference on Pervasive and Ubiquitous Computing10.1145/3675094.3677574(4-8)Online publication date: 5-Oct-2024
    • (2024)HandPad: Make Your Hand an On-the-go Writing Pad via Human CapacitanceProceedings of the 37th Annual ACM Symposium on User Interface Software and Technology10.1145/3654777.3676328(1-16)Online publication date: 13-Oct-2024

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