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 surroundings. Their right use is critical for providing prime quality acoustics.
Unique and authoritative, this e-book decribes tips to successfully degree, version, layout and practice 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 tested expertise and so the ebook blends conventional designs with glossy advancements. The ebook covers sensible and theoretical points of absorbers and diffusers and is definitely illustrated with examples of installations and case studies.
This re-creation brings Acoustic Absorbers and Diffusers updated with present learn, perform and criteria. New advancements in size, fabrics, conception and perform because the first version (published in 2004) are incorporated. The sections on absorbers are prolonged to incorporate extra approximately noise keep an eye on.

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Additional info for Acoustic Absorbers and Diffusers: Theory, Design and Application

Example text

Consequently, noise levels in working environments are subject to regulations to limit the exposure of workers. There are several methods for controlling noise exposure. The most efficient of which is usually to control the noise at the source, but this may not always be possible. Another technique that can be employed is to reduce the reverberant sound level within a space. This is only effective if the noise levels have a significant contribution from the reverberant field. For instance, it is ineffective if the worker is close to a noisy machine.

A major catalyst for this work was the pioneering research of D’Antonio [5] initially utilizing diffuser designs suggested by Schroeder [6] and also room design concepts such as live end dead end (LEDE1) [7] and reflection free zone (RFZTM ) [8]. An RFZ design strives to minimize the influence of the room acoustic on the sound reproduction and so provides a neutral two-channel critical listening room. The design creates a spatial and temporal RFZ surrounding the primary mixing or listening position(s).

Common examples are mineral wools, fibreglass, open cell foams, acoustic tiles, carpets and curtains. To gain a proper theoretical understanding of porous absorbers, it is necessary to understand the theories of sound propagating in a medium. Some basic models of sound propagation, which are the basis for much of the absorber and diffuser modelling in the book, are presented in the next section. 1 Sound propagation – a wave approach To understand and design absorbers, it is necessary to have a basic understanding of the terminology used and the fundamental mathematical constructs used for sound propagation.

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