Abstract
Acoustic equalization is the process of adjusting the frequency response of a broadband sound signal, which is widely used in communication-system and audio acoustics. Here we introduce the concept of an acoustic meta-equalizer, viz., a passive acoustic metamaterial-based filter that has a tunable frequency response within an ultrabroadband range (200 Hz--20 000 Hz) and is capable of generating a frequency equalization on the input sound signal. By using two kinds of acoustic resonant elements, viz., Helmholtz and Fabry-Perot resonators, we realize and demonstrate ultrabroadband and tunable filters within an integrated meta-structure. In analogy with the conventional equalizer concept in signal processing, we numerically, analytically, and experimentally demonstrate functional filters, signal reproductions, and sound-effect controls by the conceived acoustic meta-equalizer.
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