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Optimizing multi-user indoor sound communications with acoustic reconfigurable metasurfaces

Author

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  • Hongkuan Zhang

    (Hong Kong Baptist University)

  • Qiyuan Wang

    (Hong Kong Baptist University
    The University of Tokyo)

  • Mathias Fink

    (Université PSL, CNRS)

  • Guancong Ma

    (Hong Kong Baptist University
    Hong Kong Baptist University)

Abstract

Sound in indoor spaces forms a complex wavefield due to multiple scattering encountered by the sound. Indoor acoustic communication involving multiple sources and receivers thus inevitably suffers from cross-talks. Here, we demonstrate the isolation of acoustic communication channels in a room by wavefield shaping using acoustic reconfigurable metasurfaces (ARMs) controlled by optimization protocols based on communication theories. The ARMs have 200 electrically switchable units, each selectively offering 0 or π phase shifts in the reflected waves. The sound field is reshaped for maximal Shannon capacity and minimal cross-talk simultaneously. We demonstrate diverse acoustic functionalities over a spectrum much larger than the coherence bandwidth of the room, including multi-channel, multi-spectral channel isolations, and frequency-multiplexed acoustic communication. Our work shows that wavefield shaping in complex media can offer new strategies for future acoustic engineering.

Suggested Citation

  • Hongkuan Zhang & Qiyuan Wang & Mathias Fink & Guancong Ma, 2024. "Optimizing multi-user indoor sound communications with acoustic reconfigurable metasurfaces," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45435-4
    DOI: 10.1038/s41467-024-45435-4
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    References listed on IDEAS

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    1. Jacopo Bertolotti & Elbert G. van Putten & Christian Blum & Ad Lagendijk & Willem L. Vos & Allard P. Mosk, 2012. "Non-invasive imaging through opaque scattering layers," Nature, Nature, vol. 491(7423), pages 232-234, November.
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