Acoustic Absorbers and Diffusers: Theory, Design and Application
Absorbers and diffusers are two of the main design tools for altering the acoustic conditions of a room, semi-enclosed spaces and the outdoor environment. Their correct use is important for delivering high quality acoustics.
This unique and authoritative text describes how to effectively measure, model, design, optimise and apply diffusers and absorbers. Surface diffusion is a relatively young subject area, and diffuser design, application and characterisation are new to practitioners and researchers, who may not have been exposed to this new information in their formal training. This book is a resource for new and experienced acousticians seeking an understanding of the evolution and current state of the art in diffuser research and practice. Absorption is a more established technology, and so the book blends traditional design with modern developments. By collecting the key aspects of absorbers in one text, the book offers new and experienced professionals an opportunity to understand this subject in more depth. This detailed book serves to cover the practical and theoretical aspects of absorbers and diffusers and is well illustrated, with examples of installations and case studies.
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achieved admittance angle of incidence applied array Audio Eng autocorrelation cavity characteristic impedance comb filtering Consequently curved surfaces D’Antonio depth design frequency device diffraction diffuse reflection diffusion coefficient dispersion effects energy Equation etal f(Hz flow resistivity formulation Fourier frequency response function geometric models geometric room acoustic grating lobes Helmholtz resonator high frequency hybrid surface impedance tube incidence absorption coefficient loudspeaker low frequency maximum length sequence measurement membrane method microphone mineral wool modulation noise normal incidence optimization panel parameters perforated sheet performance periodic plane surface plane wave polar response porous absorber porous material possible prediction models problem quadratic residue random incidence absorption reflection factor reverberation chamber room acoustic room acoustic models sample scattered polar scattering coefficient Schroeder diffusers semicylinder sequence shown in Figure shows solution sound field source and receiver space spatial specular reflection surface impedance T. J. Cox technique theory wavelength wavenumber width