acoustic impedance

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 is 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, the product of longitudinal wave velocity and density of the medium divided by the surface area. Acoustic impedance can be expressed in either its constituent units (pressure per velocity per area) or in rayls.
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Noun
1. opposition to the flow of sound through a surface; acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component
(synonym) acoustic resistance, acoustic reactance
(hypernym) resistance

acoustic impedance
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B: (Fisika) impedans akustik
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