Abstract
AbstractThe absorption coefficient of an acoustical material has been widely employed by engineers and architects in the acoustical design of enclosures ever since it was first defined by Sabine, and later modified by Eyring and Millington. Unfortunately, however, the values obtained for this parameter in the different laboratories vary greatly due to differences in the methods employed for this purpose. At least two are in great vogue: the reverberation chamber method and the impedance tube method. The former yields values which are invariably higher than those realized in practice, while the values obtained by the latter method do not agree satisfactorily with field values. A statistical coefficient has also been evaluated from the normal incidence tube value, but even this figure does not provide a satisfactory correlation. The reasons for these discrepancies are discussed in detail and it is concluded that values obtained in a semi-reverberant enclosure at random incidence of sound waves are likely to...
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