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ISPICS Proforma)
BS EN 61162 discusses maritime navigation and radiocommunication equipment
1 and 2) and BS 5839 : Part 4 (as amended by Amendment Nos
Acoustics. Determination of sound absorption coefficient and impedance in impedance tubes - Transfer-function method has-corrigendum Manufacturers of pipe couplings1 Scope This test method covers the use of an impedance tube, two microphone locations and a digital frequency analysis system for the determination of the sound absorption coefficient of sound absorbers for normal sound incidence. It can also be applied for the determination of the acoustical surface impedance or surface admittance of sound absorbing materials. Since the impedance ratios of a sound absorptive material are related to its physical