Sound Control and Noise Reduction for Home Interiors
Sound as you probably know is a series of vibrations at different speeds. This gives the various pitches. The vibrations in turn vibrate the wall and the sound gets transferred through the wall via this vibration. What we try to do is stop or reduce this vibration.
Mass. The simplest method but often the most expensive is to increase the density of wall making it out of stone or brick.
However we can also increase the wall thickness by using multiple layers of plasterboard.