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 atmosphere. Their right use is critical for providing top of the range acoustics.
Unique and authoritative, this booklet decribes the way to successfully degree, version, layout and practice 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 know-how 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 learn, perform and criteria. New advancements in size, fabrics, idea and perform because the first version (published in 2004) are incorporated. The sections on absorbers are prolonged to incorporate extra approximately noise regulate.
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Additional resources for Acoustic Absorbers and Diffusers Theory Design and Application
Sabine, Collected Papers on Acoustics, Harvard University Press (1922); republished, Acoustical Society of America (1993). 7 ISO 9613-2:1996, “Acoustics – Attenuation of sound during propagation outdoors. Part 2: General method of calculation”. 8 C. F. Eyring, “Reverberation time in ‘dead’ rooms”, J. Acoust. Soc. , 1, 217–26 (1930). 9 G. Millington, “A modified formula for reverberation”, J. Acoust. Soc. , 4, 69–81 (1932). 10 M. R. Schroeder and H. Kuttruff, “On frequency response curves in rooms.
The characteristic impedance of plane waves in air is purely real with a value of about 415 MKS rayls. In an acoustic medium it will be complex, with a characteristic resistance and reactance, which are the real and imaginary parts of the impedance respectively. The characteristic impedance is analogous to the characteristic impedance of an electronic transmission line. Once the characteristic impedance and wavenumber within an acoustic medium are known, it is possible to predict the sound propagation.
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.