Here you can see an example of a diffusion coefficient normalised to a flat surface. The calculations is based on ISO 17497-2 from my personal investigation. I'm looking for reliable datas for any diffuser device to start comparison work.
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Looking for reliable datas of random incidence diffusion coefficient based on ISO17497-2
Looking for reliable datas of random incidence diffusion coefficient based on ISO17497-2
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Good question. Have you looked at the data in the Appendix of 'Acoustic Absorbers and Diffusors, D'Antonio and Cox'?