Acoustic impedance
Opposition that a system presents to an acoustic pressure / From Wikipedia, the free encyclopedia
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Acoustic impedance and specific acoustic impedance are measures of the opposition that a system presents to the acoustic flow resulting from an acoustic pressure applied to the system. The SI unit of acoustic impedance is the pascal-second per cubic metre (symbol Pa·s/m3), or in the MKS system the rayl per square metre (Rayl/m2), while that of specific acoustic impedance is the pascal-second per metre (Pa·s/m), or in the MKS system the rayl (Rayl).[1] There is a close analogy with electrical impedance, which measures the opposition that a system presents to the electric current resulting from a voltage applied to the system.
Quick Facts Sound measurements, Characteristic ...
Sound measurements | |
---|---|
Characteristic | Symbols |
Sound pressure | p, SPL, LPA |
Particle velocity | v, SVL |
Particle displacement | δ |
Sound intensity | I, SIL |
Sound power | P, SWL, LWA |
Sound energy | W |
Sound energy density | w |
Sound exposure | E, SEL |
Acoustic impedance | Z |
Audio frequency | AF |
Transmission loss | TL |
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