N2 - 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. L1 - http://www.czasopisma.pan.pl/Content/104459/PDF/20_paper.pdf L2 - http://www.czasopisma.pan.pl/Content/104459 PY - 2011 IS - No 4 EP - 966 DO - 10.2478/v10168-011-0065-1 KW - Schroeder diffusers KW - scattering KW - diffusion KW - absorption A1 - Pilch, Adam A1 - KamisiƄski, Tadeusz PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 36 DA - 2011 T1 - The Effect of Geometrical and Material Modification of Sound Diffusers on Their Acoustic Parameters SP - 955 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/104459 T2 - Archives of Acoustics