Attenuating and diffusers devices based on sonic crystals

Sonic Crystals are heterogeneous materials formed by arrays of scatterers embedded in a host material with different physical properties. Their particular properties in the control of acoustic waves lead the development of different devices, some of them highly evolved, as Sonic Crystals Acoustic Screens (SCAS) to attenuate environmental noise, or Sonic Crystals Acoustic Diffusers (SCAD) to spread sound in room acoustics. In this paper, we present the design of a new device that brings together both sound control mechanisms, attenuation and diffusion, avoiding the specular reflected noise produces in Classical acoustic barriers and improving their performance in environmental acoustics.