The impact of diffuser arrangement in a reverberation room on airborne sound insulation measurements

The primary issue in evaluating airborne sound insulation lies in quantifying the sound energy emitted by the barrier. This is typically accomplished by measuring sound pressure levels in sending and receiving rooms and acoustic absorption within the receiving room. When significant fluctuations in sound pressure levels occur within a reverberation room, it indicates the presence of standing waves, necessitating the incorporation of diffusing elements. The paper presents the results of computational modelling calculations for various configurations of diffusing elements in a reverberation room. These diffusers aim to improve the uniformity of the acoustic field in terms of acoustic pressure. Therefore, the focus of the model was on these parameters. The simulation results were verified by conducting acoustic measurements in an actual room. The ultimate goal was to assess the impact of changes in the arrangement of diffusers on the results of sound insulation measurements. As an additional criterion for evaluating the obtained results, the measurement uncertainty of sound insulation with partial uncertainties was adopted.