By T. Cox, P. D'Antonio
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Extra resources for Acoustic Absorbers and Diffusers - Theory, Design and Application
There are a variety of models in the literature, but the one outlined in Chapter 5 uses three additional parameters, two characteristic lengths and tortuosity. These are more complete models of porous absorbents, but suffer from the problem that the characteristic lengths have to be fitted empirically, and consequently the verification of the accuracy of the theories is rather circular. It is possible to directly measure the surface impedance, pressure reflection factor or absorption coefficient of a sample.
The zone is spatial, because it only exists within a certain area in the room; and it is temporal, because the interfering reflections are only controlled over a certain time window, between the arrival of the direct sound, and prior to reflections arriving from the rest of the room. It is well established that early reflections affect the characteristics of the sound at the listening position [9, 10]. One solution is to use absorption to control first-order reflections between the source and the listener and so remove early arriving high level reflections, which produce colouration and image shift.
37, 409–412 (1965). 5 W. C. Sabine, Collected Papers on Acoustics, Harvard University Press (1922), republished, Acoustical Society of America (1993). 6 C. F. Eyring, ‘‘Reverberation time in ‘dead’ rooms’’, J. Acoust. Soc. , 1, 217–226 (1930). 7 G. Millington, ‘‘A modified formula for reverberation’’, J. Acoust. Soc. , 4, 69–81 (1932). 8 M. R. Schroeder and H. Kuttruff, ‘‘On frequency response curves in rooms. Comparison of experimental, theoretical, and Monte Carlo results for the average frequency spacing between maxima’’, J.