@ARTICLE{Pilch_Adam_The_2011, author={Pilch, Adam and Kamisiński, Tadeusz}, volume={vol. 36}, number={No 4}, journal={Archives of Acoustics}, pages={955-966}, howpublished={online}, year={2011}, publisher={Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics}, abstract={Sound diffusers, in particular those based on changes in the phase of the reflected wave (Schroeder diffusers), have recently gained greatly in popularity in acoustics as an effective means to eliminate defects and improve the acoustic performance of interiors. This paper draws attention to a possibility of shaping acoustic parameters of sound diffusers and fundamental errors made in applying diffusers. Also, an often neglected issue of sound absorption by diffusers has been tackled. The presented results of laboratory measurements indicate a great significance of the diffusers' rigidity and geometry on their absorption coefficient at low frequencies. The effect of arrangement of elements on the diffusion coefficient was analysed for two types of elements based on the prime number N = 7.}, type={Artykuły / Articles}, title={The Effect of Geometrical and Material Modification of Sound Diffusers on Their Acoustic Parameters}, URL={http://www.journals.pan.pl/Content/104459/PDF/20_paper.pdf}, doi={10.2478/v10168-011-0065-1}, keywords={Schroeder diffusers, scattering, diffusion, absorption}, }