SOUND-PROOF ACOUSTIC PROTECTION Russian patent published in 2009 - IPC G10K11/16 E04B1/82 

FIELD: physics.

SUBSTANCE: sound-proof acoustic protection contains profiled and perforated walls with a layer of sound-proof material arranged there between, one of the walls being made smooth and the said sound-proof material being arranged in two layers. Note that one of the said layers, more rigid, is solid and profiled, while the other one, a soft layer, is discontinuous and arranged above the first layer surfaces. The production area sound-absorbing elements comprise a skeleton, window openings and doorways, apertures to accommodate lighting fixtures and acoustic screens representing rigid and perforated walls with sound-absorbing material arranged there between. Note that more rigid layer is a continuous and complicated-profile one made up of inclined faces directed downward and jointed to horizontal faces, while the soft layer is a discontinuous one arranged above the rigid layer sound reflecting surfaces, the aforesaid sound absorbing element rigid layer being made from a sound-proof material with sound reflection factor exceeding that of sound absorption and the discontinuous layer elements representing a taper, multi-face pyramid or a figure of rotation formed by the n^th-order curve.

EFFECT: increased efficiency of sound absorption.

4 cl, 2 dwg