This standard specifices a method for the determination of the sound absorption coefficient as well as surface impedance and admittance by use of an impedance tube, two microphone locations and a digital frequency analysis system.
DS/EN ISO 10534-2:2001 history
2001DS/EN ISO 10534-2:2001 Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes - Part 2: Transfer-function method