Reverberation Time Control by Acoustic Metamaterials in a Small Room
Sichao Qu, Min Yang, Yunfei Xu, Songwen Xiao, Nicholas X. Fang

TL;DR
This paper presents a novel design of acoustic metamaterials with multiple subwavelength resonators to control reverberation time in small rooms, achieving broadband absorption and uniform sound quality.
Contribution
It introduces a reverse-engineering approach to design acoustic metamaterials tailored for specific acoustic environments in small spaces.
Findings
Experimental results align with numerical predictions.
Design achieves broadband absorption across targeted frequencies.
Applicable to various small room acoustic scenarios.
Abstract
In recent years, metamaterials have gained considerable attention as a promising material technology due to their unique properties and customizable design, distinguishing them from traditional materials. This article delves into the value of acoustic metamaterials in room acoustics, particularly in small room acoustics that poses specific challenges due to their significant cavity resonant nature. Small rooms usually exhibit an inhomogeneous frequency response spectrum, requiring higher wall absorption with specific spectrum to achieve a uniform acoustic environment, i.e., a constant reverberation time over a wide audible frequency band. To tackle this issue, we developed a design that simultaneously incorporates numerous subwavelength acoustic resonators at different frequencies to achieve customized broadband absorption for the walls of a specific example room. The on-site…
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