Sound propagates as a longitudinal wave (change of air pressure caused by sound)
However, sound waves propagate in all directions. Therefore, a two dimensional representation shows a section through the sound wave.
3D Sound Wave
$$ λ = \frac {C} {f} $$
<aside> 🎛️ Wavelenght Formula
The Addition of several signals to sum a signal. Any acoustic or technical mixture of signal is superposition.
$$ P_{dB}=20log\frac {P} {P_0} $$
Where PdB = pressure/voltage; P = voltages/pressure; P0 = reference voltage/pressure
For example - two signal which have the same pressure add up to:
$$ P = log 20 \frac 2 1 => P= 6dB $$
Absorbtion
happens when sound hits a boundary and the material transforms it so that its energy is reduced. The degree of absorption is expressed by a number between 0 and 1. We call it the absorption factor or absorption coefficient.
Reflection
a rebound reaction of sound after it hits a surface. The reflection coefficient is similar to the absorption coefficient. It indicates the strength of the reflection