It is a common sight to see sound proof structures being installed in every building construction. The purpose of sound proofing is well recognized, but the mechanism behind it, is still an untouched concept, because of the large amount physics going on behind it. This method aims at low down the pressure of the sound, by increasing the distance between the source of the sound and the receptor of the sound. The source of the sound can be anything which produces sound, the humans, instruments and electronics, alike. And, the receptors of the sound are the walls, in buildings, and can be automobiles and various other structures. Basically, acoustic insulation dampens any sound from reaching the boundaries specified.
As logical as it may seem, this method does not only involve increasing the distance between the source and the receptor, because that would mean that one can only achieve sound proofing within a large area, and not in small areas. There are other methods such as using noise barriers, sound baffles or active anti-noise. Let’s get to the detail of each, one by one. Noise barriers also called as a sound berm or acoustic barrier, are the most common type of method to reduce noise. It is installed on the exterior of a structure to reduce noise mainly from the roads, railways and industries. The sound barrier is a device, which is installed in the ceilings and walls of a structure to reduce the impact of airborne sound or noise pollution. This form of acoustic insulation is a type of a noise barrier. The third method is to use an anti-noise. Mainly called as active noise control (ANC), this method reduces unwanted sounds or noises by adding an additional secondary sound, which cancels the primary source of a sound.
These were the basics of the method, and a further look into it will show many similarities in their installation and working, but with using different techniques. Usually, the two main important things, a sound proofing technique should be able to do is to minimize the sound leakage from a structure and to improve the quality of the sound inside the structure. These methods are frequently installed in music rooms, cinema halls and places with a larger area producing larger noise, to reduce the formation of an echo. One can say that acoustic insulation was first seen in these type of rooms.
Now, the scenario is that one can see people securing their automobiles and work places too. Besides, there are a variety of materials such as glass which act as a barrier to external noises.