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 sound-proof protection contains a skeleton, window openings and doorways, apertures to accommodate lighting fixtures and acoustic screens. Note that more rigid layer is a composite one made up of alternating spherical and flat surfaces with resonance apertures, while the soft layer is a discontinuous one made up of sound absorbers located in the focus of the first layer sound reflecting surfaces. Mind that the composite layer is made from a sound-proof material with sound reflection factor exceeding that of sound absorption. The sound absorbers located in the focus of the aforesaid composite layer represent the bodies of rotation.

EFFECT: increased efficiency of sound absorption.

4 cl, 2 dwg