Slow-Sound-Based Delay-Line Acoustic Metamaterial

Periodic structures composed of quarter-wavelength or Helmholtz resonators have been widely used in the design acoustic metamaterials. An interesting phenomenon achievable through hybridization such is slow sound, which results from strong dispersion produced by local resonances. It gives rise to many applications as deep subwavelength sound absorbers metadiffusers. All proposed so far analyzed only frequency domain (steady state). In this work, we propose a passive treatment that can be room acoustics, requires considering time and all multiple reflections. We analytically delay line metasurface made resonators, using slow-sound propagation. prove numerically experimentally pulse thus reproduce perception propagation over given distance, larger than actual size treatment. The limitations real-time propagation, dispersion, losses on audio fidelity are discussed.