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Incoherence Factor as Descriptor for the Diffusivity of Building Facades

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The reflection characteristics of a facade depends to a large extent on structure depth and frequency. A new method is proposed to discriminate between specular and diffuse behavior. As descriptor an incoherence factor ICF is introduced that compares the sound pressure of the incoherently reflected sound with the sound pressure of a Lambert diffuse reflection. The separation of the reflected energy into a coherent and an incoherent part is achieved by an experiment in which two sources emit the same signal but with a phase shift of 180 degrees. The incoherence factor was evaluated exemplarily for typical facade geometries with two-dimensional wave theoretical calculations and with three-dimensional scale model measurements.

Document Type: Research Article


Publication date: November 1, 2011

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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