AIR-COUPLED SURFACE WAVE STRUCTURES FOR SOUND FIELD MODIFICATION

摘要

.gamma. A surface wave apparatus is disclosed having reduced sound attenuation acros s a surface along a known path having a path distance when compared to sound attenuation along a same path distance through air. The surface wave apparatus includes a plurality of cells defining a first surface. Sound presented at the first surface forms a surface wave over the surface and proximate thereto. Each cell includes four bounding wal ls and a bottom. Two of the bounding walls act to guide the sound within the known pa th and two are disposed across the known path to form a structure supporting formation of surface waves.