By T. Cox, P. D'Antonio

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This is discussed in the next section. 1 Absorbent plaster ceiling applied to a restaurant (photo courtesy of BASWA acoustic, AG). 8 Applications and principles of absorbers table. 2. The impulse response is a pressure versus time graph showing the response at a receiver position when somewhere else in the room a short impulse is created. For example, a balloon burst or a starting pistol might generate the short impulse, and the response might be measured with a microphone. First of all the direct sound from the source to receiver is received.

Cylindrical, the curved surfaces can focus sound to a point like a curved mirror does with light. 9. The relevance of the diffuseness of the space to absorption technologies is as follows. 4. When the absorption is applied, however, the acoustic conditions might be dramatically different, for instance non-diffuse, which means that the anticipated changes in noise levels and reverberance might not occur. The absorption might be more or less effective than predicted; this is discussed in Chapter 12.

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. Acoust. Soc. , 34(1), 76–80 (1962). 9 T. J. Cox and P. D’Antonio, ‘‘Determining optimum room dimensions for critical listening environments: a new methodology’’, Proc.

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