TY - JOUR N2 - The main problem in the measurement of airborne sound insulation is the measurement of the sound power radiated by the barrier, in practice performed by measuring the sound pressure level and the acoustic absorption in the receiving room. Large variations of the sound pressure level in a reverberation room indicate the presence of dominating strong standing waves, so that it becomes necessary to install diffusing elements. In ISO 10140, the limits have been defined in which the reverberation time at frequencies at and above 100 Hz should be included. Sometimes, however, in the case of rooms with a large volume, obtaining the required parameters is difficult and sometimes even impossible. It should then be checked whether the measured sound insulation depends on the reverberation time. The paper presents the results of sound insulation measurements at various reverberation time lengths in subsequent stages of diffusing elements installation in the receiving room. An analysis of diffusing materials amount and arrangement influence on the uniformity of the sound pressure level distribution and reverberation time in the room as well as the value of the measured sound insulation was carried out. Uncertainty of sound insulation measurement with partial uncertainties was adopted as a criterion supporting the assessment of the obtained results. L1 - http://www.czasopisma.pan.pl/Content/113235/PDF/aoa.2019.129729.pdf L2 - http://www.czasopisma.pan.pl/Content/113235 PY - 2019 IS - No 4 EP - 746 DO - 10.24425/aoa.2019.129729 KW - reverberation room KW - airborne sound insulation KW - diffuseness A1 - Mleczko, Dominik A1 - Wszołek, Tadeusz PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 44 DA - 2019.12.31 T1 - Effect of Diffusing Elements in a Reverberation Room on the Results of Airborne Sound Insulation Laboratory Measurements SP - 739 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/113235 T2 - Archives of Acoustics ER -