Optimizing multi-user indoor sound communications with acoustic reconfigurable metasurfaces
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866929239863853056 |
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| author | Zhang, Hongkuan Wang, Qiyuan Fink, Mathias Ma, Guancong |
| author_facet | Zhang, Hongkuan Wang, Qiyuan Fink, Mathias Ma, Guancong |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_01531 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Optimizing multi-user indoor sound communications with acoustic reconfigurable metasurfaces Zhang, Hongkuan Wang, Qiyuan Fink, Mathias Ma, Guancong Sound Audio and Speech Processing Applied Physics 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. |
| title | Optimizing multi-user indoor sound communications with acoustic reconfigurable metasurfaces |
| topic | Sound Audio and Speech Processing Applied Physics |
| url | https://arxiv.org/abs/2308.01531 |