Everything about The Acoustic Impedance totally explained
The
acoustic impedance Z (or
sound impedance) is a frequency
f dependent parameter and is very useful, for example, for describing the behaviour of musical wind instruments. Mathematically, it's the
sound pressure p divided by the
particle velocity v and the surface area
S, through which an acoustic wave of frequency
f propagates. If the impedance is calculated for a range of excitation frequencies the result is an
impedance curve. Plane, single-frequency
traveling waves have acoustic impedance equal to the
characteristic impedance divided by the surface area, where the characteristic impedance is the product of
longitudinal wave velocity and
density of the medium . Acoustic impedance can be expressed in either its constituent units (pressure per velocity per area) or in
rayls.
»
is the transmission coefficient
» f is the frequency (Hz)
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