Sound absorbing device

Claim 1

A sound absorbing device, comprising a lattice-type structure having a plurality of equidistantly spaced parallel horizontal strips and a plurality of equidistantly spaced parallel vertical strips intersecting the horizontal strips at right angles to form a matrix structure having a plurality of substantially square open compartments each bordered by a pair of spaced parallel horizontal strip segments and a pair of spaced parallel vertical strip segments, a plurality of sound absorbing units in alternate compartments of the structure each of the sound absorbing units comprising four concave strip segments each extending from the midpoint of a corresponding one of the strip segments of a corresponding one of the compartments to the midpoint of a corresponding other of the strip segments of the corresponding one of the compartments to form a concave-sided square in said one of said compartments rotated 90° relative to said one of said compartments, each of the sound absorbing units further comprising a pair of intersecting cross strip segments extending between the midpoints of opposite concave strip segments of its concave sides, and a pair of sheets covering the open sides of the matrix structure, thereby providing a completely enclosed integral structure.