In recent years, the scattering coefficient has been more and more integrated in room acoustics computer simulation as it offers a handy description of the ratio between specular and diffuse reflected energy on surfaces and structures. However, the lack of scattering coefficient data, especially for commonly used furniture, limits their practical application. This paper presents a study for quantifying the influence of typical furniture in ordinary classrooms, such as chairs and desks, on the sound field reflections in terms of scattering. In a first stage, furniture of interest are properly designed and built in a scaled-down version. The scattering coefficient is then evaluated through measurements in a scaled reverberation chamber. Afterwards, acoustical measurements in a classroom are carried out and are compared to room acoustics simulation results. The measured scattering coefficients are available online.
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