SOUND-ABSORBING CELLULAR STRUCTURE Russian patent published in 2004 - IPC

FIELD: production of building units for additional sound absorbing into rooms with increased acoustic requirements and for noise reduction into channels, air ducts and wells. SUBSTANCE: building structure has frame formed of square cells. More than half of each cell is filled with sound-absorbing material alternately from front and rear structure surfaces which is flushed with structure surfaces. EFFECT: increased sound absorption coefficient in low-frequency area, providing absorption of sound energy emitted in any direction, decreased amplitude of reflected sound wave. 2 cl, 3 dwg