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Additional resources for Acoustic Absorbers and Diffusers - Theory, Design and Application

Sample text

2 Impedance, admittance, reflection factor and absorption The effect that a surface has on an acoustic wave can be characterized by four interrelated acoustic quantities: the impedance, the admittance, the pressure reflection factor and the absorption coefficient. The first three (impedance, admittance and pressure reflection factor) give information about both the magnitude and phase change on reflection. The absorption coefficient does not contain phase data, but only gives information about the energy change on reflection.

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. 110th Convention Audio Eng. , preprint 5353 (2000). 10 J. F. Allard, Propagation of Sound in Porous Media: Modelling Sound Absorbing Materials, Elsevier Applied Science (1993).

One technique for removing the echo is to apply absorption to the rear wall. The absorption attenuates the reflection and so making it inaudible as a separate acoustic source. 4 shows the Royal Festival Hall where such a solution was used. 1. For small spaces, where absorption is being used anyway for reverberation control, absorption is a possible treatment for echo problems. The absorption needs to act at mid- to high frequencies as echoes are most notable for directional instruments. Consequently, a layer of porous absorber can be used.

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