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 outside surroundings. Their right use is necessary for providing top of the range acoustics.
Unique and authoritative, this e-book decribes tips to successfully degree, version, layout and follow diffusers and absorbers. it's a source for brand spanking new and skilled acousticians, looking an realizing of the evolution, features and alertness of recent diffusers. Absorption is a extra confirmed expertise and so the e-book blends conventional designs with smooth advancements. The booklet covers useful and theoretical features of absorbers and diffusers and is definitely illustrated with examples of installations and case studies.
This new version 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 incorporated. The sections on absorbers are prolonged to incorporate extra approximately noise keep an eye on.
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Extra info for Acoustic Absorbers and Diffusers: Theory, Design and Application
1 Reducing colouration in small rooms Sound reproduction It is often useful to consider the extremes of boundary conditions when attempting to solve a room acoustic problem. In the case of a critical listening room, one extreme is Applications and principles of diffusers 33 an anechoic chamber, and the other a reverberation chamber. Anyone who has spent any time in these rooms realizes that neither is an exciting place to listen to music. An ideal critical listening room will usually lie somewhere between the two extremes.
1 shows such an absorbent ceiling. This room has a special absorbent plaster ceiling which has the advantage of being flat and monolithic and so does not visually impose on the space. The absorbent plaster is discussed in more detail in Chapter 5. A less expensive solution would be standard absorbent ceiling tile made of materials such as compressed mineral wool, mounted in a t-bar grid; but this is not as elegant. Getting the correct amount of reverberation in a space is vital to the design of most rooms, whether the aim is to make music sound beautiful, to make speech intelligible, to reduce noise levels or simply to make a space a pleasant place to be in.
In this case, zsi ! 6 ki cotðkxi di Þ kxi ð1:29Þ Absorption for pipes and ducts – porous absorber characteristics Air conditioning ducts and other pipelines are a common source of noise . Breakout noise radiates from the sides of the pipelines and ducts. The most effective treatment will be to reduce the noise at the source, but where this is not possible, application of absorbent within or external to the duct can be effective. For ventilation ducts, internal lining of the duct with porous absorbent is most effective.
Acoustic Absorbers and Diffusers: Theory, Design and Application by Trevor J. Cox