Noise absorption is achieved by changing the characteristic of the noise. Stop it from echoing. Stop the reverberation. Stop the noise reflections. All this involves handling the noise that is within the room. It seldom involves noise from outside the room. You have likely heard of a room as being a “l(fā)ive” room or a “dead” room. For this type of noise reduction or soundproofing you will use carpets, upholstered furniture, acoustical ceiling tile, soundboard or interior walls.