When air is moved, small, repetitive pressure disturbances are imparted to the air. When these pressure disturbances are sensed by a hearing mechanism (your ear), sound is created. When the receiver of sound deems it undesirable, we call it noise. Perception of sound and sound quantification ranges from ‘voodoo’ or ‘black magic’ to a perfect science by acousticians…will suffice to say I am somewhere in-between. Only definitions and basics of sound will be covered here. Read more…