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By Trevor J. Cox

Absorbers and diffusers are of the most layout instruments for changing the acoustic stipulations of rooms, semi-enclosed areas and the outdoors setting. Their right use is necessary for supplying top of the range acoustics.

Unique and authoritative, this e-book decribes easy methods to successfully degree, version, layout and observe diffusers and absorbers. it's a source for brand spanking new and skilled acousticians, looking an knowing of the evolution, features and alertness of recent diffusers. Absorption is a extra validated know-how and so the e-book blends conventional designs with smooth advancements. The booklet covers sensible and theoretical elements of absorbers and diffusers and is easily illustrated with examples of installations and case studies.

This re-creation brings Acoustic Absorbers and Diffusers updated with present examine, perform and criteria. New advancements in size, fabrics, conception and perform because the first version (published in 2004) are integrated. The sections on absorbers are prolonged to incorporate extra approximately noise keep watch over.

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Extra resources for Acoustic Absorbers and Diffusers Theory Design and Application

Example text

Bies and C. H. Hansen, Engineering Noise Control: Theory and Practice, E&FN Spon, 2nd edn (1996). 15 L. L. Beranek and I. L. Vér (eds), Noise and Vibration Control Engineering, John Wiley & Sons (1992). 16 C. S. Y. Lee and G. G. Fleming, “Measurement of highway-related noise”, Report no. FHWA-PD-96-046 and DOT-VNTSC-FHWA-96-5, US Department of Transportation (1996). 2 Applications and basic principles of diffusers In this chapter the basic principles of diffusers will be developed. Following the same style of Chapter 1, the chapter will be driven by application.

In other cases, the choice between diffusers and absorbers will rest on whether the energy lost to absorption will detract or improve other aspects of the acoustics, such as the reverberance, envelopment and intelligibility. 1 Example applications There is a growing trend away from the traditional use of absorbers on the rear wall of auditoria towards the use of diffusers. 1 Schroeder diffusers (QRD®s) applied to the rear wall of Carnegie Hall to prevent echoes (after D’Antonio and Cox2). (QRD®s) applied to the rear wall of Carnegie Hall in New York.

The time dependence is e+jωt. Unfortunately, there is no standard convention for the sign of this time dependence, so some of the literature uses a negative power in the exponential, leading to equations and results which are complex conjugates of those given in this book. Some texts and papers used a propagation constant, γ = jk, in their equations instead of the wavenumber, but this will be not often be used in this book. Consider a plane wave propagating through an acoustic medium; this could be air or a porous absorber.

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