1. Notions of airborne acoustics
Sound waves are not transmitted in a vacuum. They need a material support to propagate. In this first part, we'll look at the propagation of waves in the air around us.
The quantities we're about to consider, whether pressure fluctuations or particle displacements, are oscillatory quantities; their value varies over time around a mean level, which is unimportant, and which is ordinarily, and by convention, considered to be equal to zero.
1.1 Periodic acoustic wave
The noise perceived by the ear is linked to the variation over time of the pressure p. The simplest form corresponds to a sinusoidal evolution of p. In this case, the phenomenon can be characterized by just 2 quantities, e.g. the maximum...
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Notions of airborne acoustics
Noise in liquid or solid media
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