Now we will talk about the methods of isolation of surfaces from noise. If it is impossible to completely block the penetration of the noise, then it is not only possible from the noise, at least partially, but also necessary.
The first method is a way of noise absorption, which is based on the natural process of attenuation of sound. The function is to how to lengthen and randomly redirect the movements of the sound wave. Different fibrous materials are suitable for this. The surface of the layer of this material should be extremely thick. In addition, foam as a material for noise absorption is not good. In it, some air bubbles are tightly fixed by the design of the plastic. In view of this reason, the sound passes through it almost by a direct vector.
It is well reflected in the sound of a huge barrier from various materials of high hardness. A wall of burned brick with two blocks thick, for example, reduces the sound pressure by six decibels. But this does not interfere with the sound effects of modern street acoustics and so on. Secondary thickening of more than two blocks will not give an effect.
Naturally, you can lay an additional reflective layer. In this layer, the echo will just get knitted.
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